Effect of Warm Laser Shock Peening on Microstructure and Properties of GH4169 Superalloy

4th International Conference on Applied Materials and Manufacturing Technology

材料科学;机械制造

Hu, Taiyou^1,2 ; Li, Songxia^3 ; Qiao, Hongchao^1 ; Lu, Ying^1 ; Sun, Boyu^1 ; Wu, Jiajun^1,2

Shenyang Institute of Automation Chinese Academy of Sciences, Shenyang, Liaoning

110016, China^1

University of Chinese Academy of Sciences, Beijing

100049, China^2

Northeastern University, Shenyang, Liaoning

110004, China^3

关键词: Dislocation densities;    Hardened layers;    Laser shock peening;    Microstructure and properties;    Original sample;    Process temperature;    Strengthening effect;    Stress difference;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/423/1/012054/pdf
DOI  :  10.1088/1757-899X/423/1/012054

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In order to explore the effect of warm laser shock peening (WLSP) on the GH4169 superalloy, the microhardness, residual stress, and microstructure of the samples are compared and analyzed by laser shock peening (LSP) at 24 °C and WLSP at 200 °C, 250 °C, and 300 °C. The results show that the microhardness level and hardened layer thickness increase gradually with the increase of process temperature. Compared with LSP (24 °C), WLSP (300 °C) increased the maximum microhardness of the sample by 13.0% and the depth of hardened layer increased by 25.0%; The influence of process temperature has little effect on the residual stress level, and the residual stress difference of the samples after LSP (24 °C) and WLSP (200 °C, 250 °C, 300 °C) are within 40MPa; Compared with the microstructure of the original sample, the dislocation density of the samples after LSP and WLSP increased significantly, compared with LSP (24 °C), the number of slip line projections after WLSP (300 °C) is more, the size is larger, and there are a lot of dislocations tangled around the precipitates. This study shows that WLSP has a better strengthening effect than LSP.