Abstract：In order to investigate the changes in surface residual stresses and the effect of residual stresses on the low cycle fatigue properties of GH4169 alloy specimens during the machining process, X-ray diffraction was used to characterize the surface residual stresses of specimens with different machining processes of "turning-grinding-polishing" and to test the depth of the residual stress layer of the finished specimens. The residual stresses were measured inside the specimens by neutron diffraction. Lowcycle fatigue tests were carried out using an electrohydraulic servo universal testing machine. The results show that the residual stresses on the machined surface of GH4169 alloy change from surface residual compressive stresses to residual tensile stresses as the cutting volume increases. According to the residual stress layer depth test, machining on the surface of the specimen caused residual stress layer depth less than 0.01 mm, the internal axial residual tensile stress decreases. According to the fatigue test results, GH4169 alloy fatigue life and surface axial residual compressive stress is positively correlated.
李志龙，高怡斐，刘兰舟，赵仁伟. GH4169疲劳试样加工残余应力的表征及其对低周疲劳寿命的影响[J]. 物理测试, 2022, 40(4): 1-7.
LI Zhilong,GAO Yifei,LIU Lanzhou,ZHAO Renwei. Characterization of residual stresses during machining of GH4169 fatigue specimens and the effect on low cycle fatigue life. PHYSICS EXAMINATION AND TESTING, 2022, 40(4): 1-7.
2022, Vol. 40 
