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Start Over Author "He, Dingyong" Publisher elsevier bv
58 results on '"He, Dingyong"'

17. Heat treatment induced microstructural evolution and strength enhancement of Al–Cr–Fe–Ni–V high-entropy alloy fabricated by laser powder bed fusion

Author

Liu, Ziwei, primary, Tan, Zhen, additional, Yao, Haili, additional, Chen, Chao, additional, Zhou, Zheng, additional, Xue, Yunfei, additional, Shao, Wei, additional, Guo, Xingye, additional, Yao, Haihua, additional, Chen, Lijia, additional, Cui, Li, additional, and He, Dingyong, additional

Published
2022
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44. Effect of minor Er and Zr on microstructure and mechanical properties of Al–Mg–Mn alloy (5083) welded joints

Author

He Dingyong, Li Xiaoyan, Yang dongxia, and Huang Hui

Subjects
Equiaxed crystals, Materials science, Mechanical Engineering, Metallurgy, Alloy, Welding, engineering.material, Condensed Matter Physics, Microstructure, Indentation hardness, Grain size, law.invention, Mechanics of Materials, law, Ultimate tensile strength, engineering, General Materials Science, Tensile testing
Abstract

Samples of Al–Mg–Mn and Al–Mg–Mn–Er–Zr alloys were welded using the method of laser welding. The influence of Er and Zr on microstructure, microhardness and mechanical properties of the Al–Mg–Mn alloy welded joints were investigated. It has been found that addition of Er and Zr refines the grain size in the fusion zone, due to the formation of primary Al3Zr and Al3Er. Fine equiaxed grains are dominated near the fusion boundary of the Al–Mg–Mn–Er–Zr alloy joint, which is contrary with the columnar crystal in the Al–Mg–Mn alloy joint. Microhardness of the center of the fusion zone rises from 74HV0.1 to 84HV0.1 owing to the grain refinement by Er and Zr. The tensile test result shows that the ultimate tensile strength and yield strength are improved by adding Er and Zr. The main reason for this is related to grain refining strengthening.

Published
2013

45. Optimization of weld bead geometry in laser welding with filler wire process using Taguchi’s approach

Author

Huang Hui, He Dingyong, Li Xiaoyan, Nie Zuo-ren, and Yang dongxia

Subjects
Imagination, Materials science, media_common.quotation_subject, Alloy, Process (computing), Laser beam welding, Mechanical engineering, Welding, engineering.material, Electric resistance welding, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, Taguchi methods, law, engineering, Laser power scaling, Electrical and Electronic Engineering, media_common
Abstract

In the present work, laser welding with filler wire was successfully applied to joining a new-type Al–Mg alloy. Welding parameters of laser power, welding speed and wire feed rate were carefully selected with the objective of producing a weld joint with the minimum weld bead width and the fusion zone area. Taguchi approach was used as a statistical design of experimental technique for optimizing the selected welding parameters. From the experimental results, it is found that the effect of welding parameters on the welding quality decreased in the order of welding speed, wire feed rate, and laser power. The optimal combination of welding parameters is the laser power of 2.4 kW, welding speed of 3 m/min and the wire feed rate of 2 m/min. Verification experiments have also been conducted to validate the optimized parameters.

Published
2012

46. Microstructure Characteristics of TIG Welded Al-Mg Alloy with Small Amount Er Addition

Author

Nie Zuo-ren, He Dingyong, Huang Hui, Zhang Guanzhen, Li Xiaoyan, and Yang dongxia

Subjects
Equiaxed crystals, Materials science, Gas tungsten arc welding, Metallurgy, Alloy, General Engineering, Electron microprobe, Welding, engineering.material, Microstructure, law.invention, Optical microscope, Transmission electron microscopy, law, engineering
Abstract

Samples of Al-Mg-Mn-Zr-Er alloys were welded by the method of TIG welding. Microstructures of base metal and welded zones were analyzed by optical microscopy (OM), electron probe micro-analyzer (EPMA) and transmission electron microscopy (TEM). Particular emphasis was laid on the existence form of Er and its effect on the microstructure and the phase composition of the fusion zone. Results reveal that the trace rare earth element Er mainly exists in the form of primary and secondary Al3Er phase, which play significant roles of refining and strengthening the fusion zone. A characteristic Equiaxed Zone (EQZ) is obtained beside the fusion boundary between the partially melted zone and the fusion zone (FZ) due to the addition of Er.

Published
2012

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