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

doi:10.1117/12.2579389

2 December 2020 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, 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics; 1171706 (2020) https://doi.org/10.1117/12.2579389
Event: 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics, 2020, Shanghai, China

Abstract

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.

Citation Download Citation

Xianliang Hu, Jibin Zhao, Jiajun Wu, Ying Lu, Boyu Sun, Yuqi Yang, and Hongchao Qiao "Effect of laser shock processing on the surface morphology and microstructure of metal material", Proc. SPIE 11717, 24th National Laser Conference & Fifteenth National Conference on Laser Technology and Optoelectronics, 1171706 (2 December 2020); https://doi.org/10.1117/12.2579389

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
15 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Metals

Plasma

Titanium

Aluminum

Laser processing

Surface roughness

Laser energy

Keywords/Phrases

Search In:

Publication Years