Influence of Abrasive Waterjet Peening on Low Cycle Fatigue Performance of Inconel 690 Alloy

doi:10.3901/JME.2025.24.063

Abstract

Abstract: Investigated the effect of submerged abrasive water jet peening (SAWJP) on the low-cycle fatigue properties of Inconel 690 material. The Inconel 690 specimens were surface strengthened by abrasive water jet peening, and low-cycle fatigue tests under strain control were carried out before and after strengthening. Internal stress partitioning was performed using Matlab programs to analyze the influence of water jet strengthening on the evolution of internal stress. Additionally, the fatigue crack propagation patterns of the alloy during the fatigue tests were examined using a scanning electron microscope (SEM). The results indicate that the surface and subsurface hardness of the Inconel 690 specimens significantly increased after strengthening, introducing a certain depth of residual compressive stress. The material's surface underwent considerable plastic deformation, with the depth of the plastic deformation layer reaching up to 35.63 μm. The cyclic deformation response of the specimens before and after strengthening both exhibited rapid cyclic hardening followed by continuous cyclic softening until final fracture. After water jet strengthening, the maximum stress value of the material increased, and the plastic strain decreased. Additionally, the contribution of back stress in the strengthened specimens increased, reflecting that water jet strengthening introduced a certain thickness of plastic layer and a high-density dislocation layer. An increase in heterogeneously distributed structures at different scales was observed, and this effect persisted into the mid to late stages of cyclic loading. The source of fatigue cracks in the strengthened specimens shifted from the edges or surface to the subsurface and internal areas of the specimen edges. Compared to the original specimens, the fatigue striations of the strengthened specimens had relatively larger intervals.

Key words: abrasive waterjets, Inconel 690 alloy, low-cycle fatigue, cyclic deformation, internal stress

CLC Number:

TP69

WANG Ning, ZHU Xianhao, YAO Shulei, WU Qiuyu, PAN Fei, YU Hao, ZHANG Xiancheng, TU Shantung. Influence of Abrasive Waterjet Peening on Low Cycle Fatigue Performance of Inconel 690 Alloy[J]. Journal of Mechanical Engineering, 2025, 61(24): 63-74.

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