The Effects of Laser Shock Peening on Fatigue Life in Ni-based Superalloy
The goal of this work was to determine effects of laser shock peening (LSP) on the fatigue life of the nickel-based superalloy, as well as the mechanism including the residual stress-depth profile (both depth of compression and magnitude) and the microstructure. The vibration fatigue performance of the standard test coupons made by Ni-based superalloy K417 with and without laser shock peening is researched. The residual stress distribution and microscopic structure after LSP are tested and analyzed by X-ray diffraction, SEM and TEM. The results indicated that the compress residual stress is up to 1.0mm in the test coupons after LSP, and the maximum residual compressive stress is about 660MPa under the surface. At the same time, the high pressure shock wave caused by laser propagate into the material which formed high density dislocation in the surface of the samples, and the γ is divided leading to increase the sub-grain. Because of the deep residual compressive stress, high density dislocation and much more sub-grains, the vibration fatigue strength is improved about 180MPa by LSP. It is very instructive in the structure design and applying LSP to Ni-based superalloy.
Laser shock processing Ni-based superalloy Vibration fatigue Micro-structure Residual stress
Weifeng He Yinghong Li Qipeng Li Hailei Liu Yuqin Li Ruijun Liu
The Engineering Institute, Air Force Engineering University, Xi’an 710038, China
国际会议
广州
英文
209-214
2010-11-05（万方平台首次上网日期，不代表论文的发表时间）