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268 results on '"Guo, Chunhuan"'

33. Effect of additive manufacturing process and heat treatment on microstructure and properties of Ti-6Al-4V alloy

Author

DONG Wanpeng, GAO Huabing, GUO Chunhuan, DONG Tao, YANG Zhenlin, LI Haixin, and JIANG Fengchun

Subjects
additive manufacturing, ti-6al-4v alloy, process parameters, heat treatment, microstructure, performance, Motor vehicles. Aeronautics. Astronautics, TL1-4050
Abstract

Ti-6Al-4V(TC4) titanium alloy is a kind of α+β type two-phase titanium alloy widely used. However, due to the microscopic defects in additive manufacturing titanium alloy, its mechanical properties are lower than the forging level, and post-treatment is usually required. Therefore, it is necessary to further study the additive manufacturing process and post-treatment of TC4 titanium alloy. In this paper, the microstructure and comprehensive properties of titanium alloy were analyzed by the changes of common process parameters such as energy input power and scanning strategy in the additive manufacturing process, and the influence of other process parameters such as protective gas type, substrate thickness, powder size and other factors in the additive manufacturing process was introduced. The influence of common heat treatment methods after additive manufacturing on its microstructure and mechanical properties was also comprehensively analyzed, and the influence of new post-heat treatment methods, such as vacuum heat treatment and cyclic heat treatment, as well as the influence of multiple post-treatment and comprehensive use of heat treatment were summarized. Generally speaking that the reasonable selection of additive manufacturing process parameters and the application of post-heat treatment method are the basis for obtaining titanium alloy components with excellent performance. The comprehensive use of various heat treatment methods or other post-treatment methods and heat treatment are the effective ways to further improve the performance of titanium alloy components in additive manufacturing. To establish a uniform selection standard for additive manufacturing process parameters and post-processing process is the key to the future development of additive manufacturing.

Published
2022
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34. Research progress in metal foam composites

Author

DIAO Mingxia, GUO Chunhuan, GAO Huabing, LI Haixin, DONG Tao, XIAO Mingying, YANG Zhenlin, and JIANG Fengchun

Subjects
metal foam composite, fabrication process, microstructure, property, application, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

Metal foam composite is a kind of lightweight composite with low density, high strength, high shielding performance, high damping performance and other characteristics. It has a wide range of application prospects in aerospace, drilling trap floats, artificial bone and other fields, which has attracted people's attention. In this paper, based on the research of the existing literature, the fabrication methods of metal foam composites were introduced, the effect of microstructure on the properties of metal foam composites was analyzed, the progress of mechanical properties, damping properties, shielding properties and heat insulation and their mechanisms of metal foam composites and their applications in relevant fields were reviewed, which provides a theoretical basis for the development of metal foam composites in the future, and the new fabrication technology, modeling research, sandwich structure of metal foam composites and the fabrication of high performance foam hollow sphere composite were also prospected.

Published
2022
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41. Research progress in microstructure and properties of dissimilar joints of titanium alloy/steel

Author

WANG Zhe, XIAO Mingying, GAO Huabing, DONG Tao, LI Haixin, YANG Zhenlin, GUO Chunhuan, and JIANG Fengchun

Subjects
titanium alloy, steel, joining technology, intermediate layer, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

The study status on the joining of titanium alloy/steel dissimilar joint technology was summarized and reviewed, the microstructure characteristics of titanium alloy/steel direct joining and interlayer joining interface were analyzed.The formation and evolution process of titanium alloy/steel joint interface products with different interlayers (copper, copper-based alloy and others) were emphatically described, and the mechanical properties of titanium alloy/steel with different interlayers and preparation processes were also summarized.Finally, the methods and design ideas that can be adopted for the preparation of good titanium alloy/steel joints were summarized, and it was pointed out that the future development of this field can be combined with simulation in addition to using traditional methods to further the existing research, so as to achieve deeper understanding and experimental prediction.

Published
2022
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49. Investigation on the acoustic properties of structural gradient 316L stainless steel hollow spheres composites

Author

Wang Chunhe, Guo Chunhuan, and Jiang Fengchun

Subjects
structural gradient metal hollow spheres composites, acoustic performance, sound absorption and insulation mechanism, Materials of engineering and construction. Mechanics of materials, TA401-492
Abstract

In this study, a kind of structural gradient metal hollow spheres composites (SG-MHSCs) were fabricated using two kinds of 316L stainless steel hollow spheres with different diameters and A356 aluminum through the casting method. Then the density of the SG-MHSCs was measured by the direct measurement; the microstructure of the SG-MHSCs was characterized by the Scanning Electron Microscope. Meanwhile, the acoustic performance of MHSCs was tested by the impedance tube, and the sound absorption and insulation mechanism SG-MHSCs were discussed and analyzed.

Published
2021
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50. Investigation on the Low‐Frequency Acoustic Performance of Polymer Matrix Composite With Metallic Hollow Spheres Under Different Acoustic Stack Structures.

Author

Guo, Chunhuan, Sun, Peng, Shao, Shuaiqi, Yu, Tianmiao, Jiang, Fengchun, Li, Yanchun, Cui, Xianghong, and Li, Junqing

Subjects
ABSORPTION of sound, METALLIC composites, SOUNDPROOFING, METAL foams, SOUND waves, MELAMINE
Abstract

In this study, various polymer matrix composites (melamine and flexible polyurethane) combined with 316 L stainless steel hollow spheres were prepared using the casting method. The acoustic properties of the fabricated materials were evaluated under low‐frequency conditions (100–1700 Hz) using an impedance tube. The results indicate that sound absorption and insulation performance are significantly influenced by the incident surface material within this frequency range. Notably, sound waves entering through the polyurethane stainless steel hollow sphere surface yield optimal absorption performance, achieving a maximum sound absorption coefficient of 0.74 at 400 Hz. Conversely, the melamine foam surface provides the best sound absorption at higher frequencies within this range, reaching a coefficient of 0.43 at 1700 Hz. The findings highlight the effective sound absorption and insulation capabilities of the composite materials. [ABSTRACT FROM AUTHOR]

Published
2024
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