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| Characterization of residual stresses during machining of GH4169 fatigue specimens and the effect on low cycle fatigue life |
| LI Zhilong 1,GAO Yifei 1,2,LIU Lanzhou 1,ZHAO Renwei 2 |
1. Central Iron and Steel Research Institute, Beijing 100081, China;
2. NCS Testing Technology Co., Ltd., Beijing 100081, China |
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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.
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Received: 31 March 2022
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2022, Vol. 40 
