材料科学
喷丸
喷丸
高温合金
残余应力
压痕硬度
冶金
超声波传感器
表面粗糙度
疲劳试验
硬化(计算)
位错
复合材料
微观结构
医学
放射科
图层(电子)
作者
Zhi Qin,Bin Li,Tianyue Chen,Chen Chen,Rui Chen,Haizhen Ma,Hongqian Xue,Changfeng Yao,Liang Z. Tan
标识
DOI:10.1016/j.ijfatigue.2023.107799
摘要
This study investigates the effects of two different shot peening techniques, conventional shot peening (CSP) and ultrasonic shot peening (USP), on the very high cycle fatigue (VHCF) properties of the GH4169 superalloy. The study evaluates and compares surface roughness, X-ray diffraction patterns, microhardness, and residual stress in specimens treated with CSP and USP. The VHCF tests reveal that both CSP and USP treatments improve the VHCF properties of the GH4169 superalloy. However, while the USP-treated specimens have deeper work hardening and compress residual stress layers, their VHCF lives are significantly shorter than those of the CSP-treated specimens. Additionally, the study finds that the stress triaxiality, which inhibits dislocations at the crack tip, is higher closer to the center of the specimen. The transmission electron microscopy (TEM) results further confirm that the reduced dislocation density and increased stress concentration in the plastic zone of the high stress triaxiality region promote fatigue short crack propagation and reduce the fatigue properties of the material.
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