Mr. Boyu Sun Profile

Boyu Sun

at Shenyang Institute of Automation

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Proceedings Article | 2 December 2020 Paper

Effect of laser shock processing on the surface morphology and microstructure of metal material

Xianliang Hu, Jibin Zhao, Jiajun Wu, Ying Lu, Boyu Sun, Yuqi Yang, Hongchao Qiao

Proceedings Volume 11717, 1171706 (2020) https://doi.org/10.1117/12.2579389

KEYWORDS: Metals, Titanium, Plasma, Aluminum, Laser processing, Surface roughness, Laser energy

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Laser shock processing (LSP) is a surface hardening technology by using plasma shock waves, which can improve the mechanical properties of material and extend the service life significantly. This work introduced the mechanism of LSP briefly, the analysis of the effect of LSP on the surface morphology, microstructure of material and its related laws are summarized with the aspect from aluminum alloy, titanium alloy and superalloy. The results show that the strong plastic deformation would be appeared in the near-surface of material due to the laser-generated stress effect, resulting the change of surface roughness and the microstructure evolution. At the same time, high-density dislocation walls, dislocation tangles and mechanical twins are generated on the surface, which are accompanied by changes in grain refinement and increased grain boundaries, thereby significantly improve the mechanical properties of material. The convex structure can be found on different material surfaces after LSP, which is micro-scale reverse deformation caused by the free plastic flow of materials under laser shock. And the high pressure of shock waves can lead to destructive dimples on the material surface, and affect its service performance. Aiming at the characteristics of different material, this work comprehensively compares the differences in the surface morphology and microstructure changes of the alloys caused by LSP, and makes a detailed analysis and discussion. This work is helpful for researchers to further understand the high strain rate dynamic plastic deformation mechanism of material treated by LSP, and promote the development of LSP.

Proceedings Article | 15 November 2018 Paper

Experimental investigation of laser shock peening on TC17 titanium alloy for thin-wall workpieces

Boyu Sun, Hongchao Qiao, Jibin Zhao, Ying Lu

Proceedings Volume 10964, 1096436 (2018) https://doi.org/10.1117/12.2505912

KEYWORDS: Reflection, Titanium, Wave propagation, Diffraction, Particles, Pulsed laser operation, Acoustics, Aerospace engineering, Thermal effects, Crystals

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To study the performance and microstructure of TC17 thin-walled parts in shock wave and its reflection wave induced by laser, TC17 titanium alloy samples are processed using YAG laser with the wavelength of 1064 nm, pulse energy of 7J and pulse width of 15ns. Thus, its residual stress, microhardness and microstructure of overlapping shock with different thickness are obtained. The results show that with the thickness increasing, the front micro-hardness increases, and the reverse micro-hardness increases firstly and then decreases. The variation of residual stress with the thickness is consistent with the micro-hardness. The front residual stress maximum reaches -496.5MPa at the thickness of 5mm, and the reverse residual stress maximum reaches -171.1MPa at the thickness of 2mm. With the increase of thickness, the distribution of surface dislocations is more uniform, the grain refinement effect is more obvious, and the strengthening effect is the better. The causes of the variation of the double-sided residual stress field with the thickness are explained by theoretical analysis of the propagation and reflection of the shock wave in the material. The conclusions of this investigation have significance for the optimization of laser shock peening thin-wall workpieces.

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