Search

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The steam generator is subjected to the action of high temperature and high-pressure steam， and the flow induced vibration phenomenon of its heat transfer tube is caused by the secondary lateral flow. At the same time， the periodic loads cause fretting wear and fretting fatigue in the Inconel 690 alloy tube heat transfer tube and 403SS anti-vibration bar， which makes the heat transfer tube crack or even rupture and fail， and affects the safe operation of the nuclear power system. The friction and wear test of Inconel 690 alloy heat transfer tube and 403SS anti-vibration bar under different normal loads and displacement amplitudes was carried out by using fretting wear testing machine under normal temperature air and high-temperature air. The surface wear morphology and oxidation components of Inconel 690 alloy heat transfer tube were analyzed to reveal the wear failure mechanism of the heat transfer tube of the steam generator. The results show that with the increase of normal load at room temperature， debris accumulation and delamination appear on the surface of worn scars， and the degree of oxidation gradually intensifies. The fretting wear mechanism is mainly friction oxidation， abrasive wear， and delamination. Under the condition of high-temperature air， the peak friction force and the depth of worn scars increase， and the width of worn scars decrease. The plastic flow on the surface of the material is obvious， and the degree of oxidation and delamination deepens under the condition of high-temperature air. The fretting wear mechanism is mainly friction oxidation and delamination.

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Machine Tool & Hydraulics is the property of Guangzhou Mechanical Engineering Research Institute (GMERI) and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Steam generator (SG) is the key component of primary and secondary circuits in pressurized water reactor (PWR) nuclear power plant. Its integrity is very important for the safe operation of PWR nuclear power plant. During operation, the secondary side flow of SG will cause the vibration of the heat transfer tube, which will lead to the collision between the heat transfer tube and the supporting parts, resulting in the fretting wear of heat transfer tube. With the increase of the service life of SG, fretting wear between the heat transfer tube and the supporting parts causes the failure phenomenon of heat transfer tube to increase gradually, leading to the tube wall thinning or even rupture, thus affecting the efficient and safe operation of nuclear power plant. For the fretting wear phenomenon of SG heat transfer tube, the fretting wear behavior of 690TT alloy SG heat transfer tube under high temperature and high pressure water environment through experimental research was simulated in the paper. The fretting wear test system independently developed in China, was used for fretting wear test of tubular and plate friction pairs under high temperature and high pressure water environment. After the test was completed, the wear volume, the three-dimensional morphology of the wear marks and the section profile of the wear parts were analyzed by using the white light interferometer, and the wear coefficient of the 690TT alloy heat transfer tube under high temperature and high pressure water environment was calculated. The effects of the fretting cycle and displacement amplitude on fretting wear damage mechanism and wear performance of 690TT alloy heat transfer tube were systematically studied. The results show that the fretting cycle has little influence on fretting wear behavior and damage mechanism, but it has influence on the evaluation of material wear performance. It is necessary to calculate the exact material wear coefficient by difference method. The displacement amplitude has great influence on the fretting wear behavior and damage mechanism of the heat transfer tube. When the amplitude increases from 20 μm to 150 μm, the wear coefficient increases from 1.014×10-13 Pa-1 to 3.653×10-13 Pa-1. Under high temperature and high pressure water environment, fretting wear condition is very complicated. A variety of wear mechanisms, including adhesive wear, fatigue wear, stripping wear and oxidation wear, cause fretting wear damage. When the amplitude is small, the main wear mechanism is adhesive wear, and the characteristic region is adhesive wear. When the amplitude increases, the wear mechanism changes to oxidation wear, stripping wear and abrasive wear.

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electroplating & Finishing is the property of Electroplating & Finishing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Most researches on fretting wear mainly focus on the wear characteristics of specific materials, while the research on the distribution of stress field and its influencing factors in fretting contact state is less. However, the distribution of the stress field in the fretting contact area directly determines the wear behavior of the materials in the contact area. Aiming at the problem of the influence of key fretting parameters on the contact state during fretting wear, the contact state of fretting wear was studied. Firstly, the finite element model of cylinder-plane fretting contact was established using Abaqus software, and the selection of key fretting parameters was planned in groups, and the specific loading process was determined. Secondly, the accuracy of the finite element model was verified by the analytical method, and the contact state of the cylinder-plane fretting contact finite element model was simulated by finite element method. Finally, according to the simulation results, the effects of normal load, displacement amplitude and friction factor on the stress field distribution and contact state in the contact area were analyzed and discussed. The results show that the normal load mainly determines the contact width and the range of shear stress in the contact area, the friction factor mainly affects the boundary between partial slip regime (PSR) and gross slip regime (GSR), and the displacement amplitude determines the contact state between the specimen and the fretting pad. Among the above factors, the displacement amplitude is the main influencing factor. Under the joint action of multiple variables, the fretting contact exhibits different tribological behaviors and thus affects the fretting wear mechanism. [ABSTRACT FROM AUTHOR]

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Aiming at the problems that electrical connectors reducing contact performance by fretting wear in vibration environments, an ultrasonic testing method was used to monitor the characteristic values of wear debris between electrical connector contacts during fretting wear, and to study the wear degree of contacts under different vibration conditions and the degradation law of contact performance. The results show that the vibration frequency, vibration acceleration, and fretting times have positive cumulative effects on the debris accumulation and contact resistance fluctuation. When the electrical connector vibrates axially, the debris accumulation effectiveness is the most obvious. The contact resistance and the total amount of wear debris characteristic values show a very high correlation under high vibration frequency and acceleration. The average absolute errors of SSA-BP performance degradation model are less than 5% based on the wear debris characteristic values. [ABSTRACT FROM AUTHOR]

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Lubrication Engineering (0254-0150) is the property of Editorial Office of LUBRICATION ENGINEERING and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to promote the application of cold spray technology in the field of aviation protective coatings, this work prepared CuNiIn coating on surface of TC4 titanium alloy via cold spray with nitrogen technology. The macrostructure and microstructure, microhardness and fretting wear properties of the coating were analyzed by optical microscope, scanning electron microscope, microhardness tester and fretting wear tester respectively. Results showed that the overall porosity of the coating was about 2.8%, and the closer to the substrate, the denser the coating. The microstructure of the coating was finer than that of the original powder. Moreover, the hardness value of the coating increased from the substrate to the surface along the thickness direction, which changed from 274 HV2 N of average hardness near the substrate to stable value of 300 HV2 N near the surface of the coating. When the fretting displacement was small, the coating failure mechanism was mainly adhesive wear, and the wear morphology was oval. When the fretting displacement was large, it was mainly abrasive wear, and the wear morphology was close to circular.

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to compare the effects of different displacement amplitudes on the fretting wear properties of cobalt-based coatings at high temperature， the CoMoCrSi coating was prepared by the oxygen-assisted supersonic flame spraying process. The high-temperature fretting wear performance test of the coating under different displacement amplitudes was carried out on the self-made high-temperature fretting wear tester.The white light interference scanner was used to measure the wear volume and the wear rate was correspondingly calculated， the scanning electron microscope and energy dispersive spectrometer were used to observe the surface morphology of the wear scar and analyze the element composition， and the surface phases of the wear scar were also analyzed. Results showed that when the displacement amplitudes were 30 μm and 60 μm， the friction coefficient showed a fluctuating upward trend， and the final friction coefficient stabilized at about 0.35 and 0.55. As the displacement amplitude increased， the wear rate was proportional to the wear volume； the wear mechanism was changed from slight plastic change to the mixed mechanism of abrasive wear and adhesive wear， and to the mechanism of abrasive wear accompanying with adhesive wear. The coating in the fretting wear zone was mainly composed of Co7Mo6， Co3Mo and Co3Mo2Si phases.

The grain boundary engineering (GBE) treatment of heat treatment and cold rolling was adopted.The fretting wear behavior of Inconel 690TT alloy in air at room temperature and 320 ℃ was studied by OM, SEM, EBSD and white light interferometer. The results show that the proportion of low-∑ CSL boundaries of the best GBE sample is more than 70%, which is produced after 5% cold rolling,high temperature and short time annealing. The wear volumes and friction coefficients of the Inconel 690TT alloy samples at room temperature and 320 ℃ decrease with the increase of hardness and increase with the increase of grain size and low-∑ CSL boundary fraction. The fretting zone characteristic of Inconel 690TT alloy samples with larger grain sizes and higher proportion of low-∑ CSL boundaries under the same fretting experimental parameters is prone to full sliding, whereas it tends to partial sliding. Compared with grain size, the low-∑ CSL boundary fraction plays a more important role in determining the fretting behavior of GBE samples. The sample with higher fraction of low-∑ CSL boundaries has lower resistance to fretting wear, so GBE treatment is inimical to improving the fretting wear resistance of materials.

Copyright of Bearing is the property of Bearing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to study the loosening mechanism of the flange joint bolt in the lateral vibration,the transverse fretting wear test of simulated fasteners was carried out by means of transverse vibration fatigue testing machine,and then the pretightening force and pre-loading of bolt joints under different lateral loads and frequencies were observed.,and measure the amount of wear and surface damage. The experimental results show that the bolt preload reduction is divided into two stages:the plastic deformation stage in which the pre-tightening force decreases rapidly and the fretting wear stage in which the pre-tightening force decreases slowly. The pre-tightening torque drop is divided into three stages:the first stage is not obvious due to the high local contact stress;the second stage is rapidly degraded due to the plastic deformation,and the third stage bolt enters the fretting wear. At the third stage,the pre-tightening torque begins to slowly decrease. Under low frequency vibration of the bolt,the amount of mass change is not sensitive to small changes in frequency. The surface wear of the bolt in contact with the clamp increases as the alternating amplitude load increases;it decreases as the frequency increases.

Using self-piercing riveting (SPR), the joinability of dissimilar sheet combinations in TA1 pure titanium (TA1) and 1420 aluminium-lithium (AL1420) alloy sheets were studied. SPR joints of TA1/AL1420 (TAF), AL1420/TA1 (ATF) and TA1/AL1420 (TAS) were fabricated from different rivets in the hardness of ≥ 44HRC and ≥ 46HRC, correspondingly. High cycle fatigue tests were conducted based on tensile-shear tests. Then F-N curves of different joints were fitted. Furthermore, fretting wear mechanisms of SPR joints were analysed by scanning electron microscopy (SEM) and energy disperse spectroscopy (EDS). Results show that the fatigue strength of ATF joints is better than that of the other joints. And the fatigue strength of TAS joints is superior to TAF joints at middle and high load level. Fatigue failure of all joints initiates in fretting wear areas, and fatigue wear results in fatigue crack initiation. Fretting degree is an important factor for affecting fatigue strengths. The serious fretting wear areas are different at different load levels, and then the initiated areas of fatigue cracks are different. Finally, different failure modes occur in the same SPR joints.

The abrasion of the shaft end of the cone bit is caused by many factors, In this paper, we mainly analyze the effect of the longitudinal vibration characteristic of the drill bit on the end of the tooth wheel on the wear and mechanism of the tooth axle end. And firstly, the longitudinal dynamic model of the three-cone bit is established, and on this basis, the vibration characteristics of the three-cone bit are analyzed, and the influence of the longitudinal vibration of the roller on the wear of the tooth wheel is explored, and the numerical model of fretting wear is established. It is found that the wear volume of the tooth axle end is mainly affected by the normal pressure of the contact surface of the tooth axle and the bearing and the tangential relative slip distance between the tooth axle and the bearing. At last, the paper analyzes the wear mechanism of the three-cone bit and has a positive effect on the study of the improvement of the life of the cone bit.

The fretting wear behavior of micro-arc oxidation (MAO) treated ZK60 magnesium alloy under simulated bone plate-screw service condition was investigated. The MAO treatments on the surface of ZK60 magnesium alloy were conducted with different duty cycles of 20%, 30%, and 40%, respectively. Results show that the surface hardness and corrosion resistance of MAO-treated magnesium alloy specimens with different duty cycles are similar and are improved significantly in comparison with the bare magnesium alloy. Under the simulated bone plate-screw fretting condition, the worn surface of the bare magnesium alloy is characterized by ploughs and corrosion pits, accompanied with a high wear volume of 13.1×106μm3, while the wear is obviously decreased and mainly dominated by ploughs on the surface of the MAO-treated magnesium alloy. With the increase of duty cycle, the wear volume is 6.6×106,6.1×106μm3 and 6.5×106μm3, respectively. There is no obvious difference in the fretting wear behavior and the worn surface morphology among the MAO-treated ZK60 magnesium alloy specimens with different duty cycles. In sum, the anti-fretting wear performance of ZK60 magnesium alloy can be improved obviously after micro-arc oxidation treatment, and the duty cycle has little influence on the microstructure and fretting wear properties of the MAO layer on ZK60 magnesium alloy under the given experimental conditions.

A high quality iron-based P/M valve seat material was prepared by pressing, sintering, and copper infiltration. Fretting wear experiments were carried out by SRV Ⅳ tester to investigate the effect of the amount of infiltration on fretting wear properties of valve seat material. The results indicate that within certain range, with the increase of the amount of infiltration, higher density, hardness and crushing strength of the material are obtained, the friction coefficient and wear volume are reduced as well, and the wear mechanism changes in different degrees. The wear mechanisms of the specimens infiltrated with low amount of copper or without infiltration are mainly abrasive wear and fatigue spalling. When infiltrated with 10%Cu(mass fraction, the same below), the specimens are worn in the form of slight abrasive and fatigue spalling. The specimens infiltrated with 15%Cu show the best fretting wear resistance with very slight adhesive wear. As the infiltration amount reaches 20%, the mechanical properties of the specimens decline, the wear volume increases simultaneously, and adhesive wear is the main wear mechanism. The copper infiltrated specimens show better wear resistance than the substrate.

Copyright of Coatings & Protection / Tuceng yu Fanghu is the property of Coating & Protection Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Rare Metal Materials & Engineering is the property of Northwest Institute for Nonferrous Metal Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Petroleum Machinery is the property of China Petroleum Machinery Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Mechanical Engineering is the property of Editorial Board of China Mechanical Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Materials Engineering / Cailiao Gongcheng is the property of Journal of Materials Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Fretting test was carried out using an SRV-Ⅳ fretting test rig in order to investigate the fretting behavior and mechanism of Inconel 600 alloy at high temperature. The results indicate that high temperature is beneficial to the formation of an adhesion zone,but restrain the generation of a micro-sliding zone. The friction coefficient and wear loss decrease with the increase of temperature. Friction oxidation mainly occurs in the sliding zone of wear scars,while there is little oxidation in the adhesion zone. Oxygen concentration in the sliding zone at high temperature is more obvious than that at room temperature. At the center of the adhesion region,the oxygen content is low and there is a lot of single Ni,Cr and Fe. At the wear scar surface,the oxides are composed of NiO,Cr2O3 and Fe3O4. At both room temperature and high temperature,microcracks are usually found in the sliding/adhesion junction zone,while the position of crack initiation at high temperature is in the micro-sliding zone. However,the number and length of cracks at high temperature are less than those at room temperature.

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Harbin Institute of Technology. Social Sciences Edition / Haerbin Gongye Daxue Xuebao. Shehui Kexue Ban is the property of Harbin Institute of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Machines & Control / Dianji Yu Kongzhi Xuebao is the property of Electric Machines & Control and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The fretting corrosion tests on a hall-on flat contact of pure titanium were carried out under the media of distilled water and Saline solution on a hydraulic fretting tester with high precision. On the base of the dynamics analyses of fretting behaviours, the surface morphologies and wear volume of fretting scars were examined by laser confocal scanning microscope (LCSM). The results indicate that the friction coefficients are reduced and the positions of fretting regimes are changed by aqueous media of distilled water and Saline solution. The wear volume is the smallest under the condition in air. The friction coefficient and wear volume increase with the increase of the displacement in all three media. The fretting wear mechanisms exhibite mainly the combination of adhesive wear and delamination. The synergy of corrosion and wear in aqueous media accelerates evidently the material loss of titanium. [ABSTRACT FROM AUTHOR]

AISI 304 austenitic stainless steel was ion implanted with tungsten and the improvement in surface hardness and fretting wear was investigated. The W ion implantation was carried out using a metal vapor vacuum arc (Mevva) ion source, with a mean energy of 105 ke V under a current density of 22 µA/cm² and at doses of 3 x 1017 cm² … 5 x 1017 cm². Micro-hardness and {retting wear of the implanted samples were measured and compared to the unimplanted substrate. The area of fretting scar was decreased by 32% to 48% after W ion implantation, which should be attributed to the hardening effects and high compressive residual stress generated by ion implantation. Owing to the defect hardening and solution hardening, the near-surface hardness was improved by a {actor of three after the ion implantation. [ABSTRACT FROM AUTHOR]