磨料水射流强化对Inconel 690合金低周疲劳性能的影响

doi:10.3901/JME.2025.24.063

摘要/Abstract

摘要： 研究淹没式磨料水射流强化对Inconel 690材料低周疲劳性能的影响。对Inconel 690试样进行磨料水射流表面强化，开展强化前后试样在应变控制下的低周疲劳试验，运用Matlab程序进行内应力划分，分析水射流强化对内应力演化的影响，并结合扫描电子显微镜分析疲劳试验过程中合金的裂纹扩展规律。结果表明，强化后Inconel 690试样的表面及次表面硬度明显提高，引入一定深度的残余压应力，材料的表面发生明显的塑性变形，塑性变形层深度可达到35.63 μm。强化前后的试样循环变形响应均为先快速循环硬化再持续循环软化，直到最终断裂；水射流强化后材料的最大应力数值提高，塑性应变下降；此外，强化试样的背应力贡献值都有所提高，反映了水射流强化引入了一定厚度的塑性层和高密度位错层，不同尺度的不均匀组织增多，并且这一影响持续到循环加载的中后期。强化试样的疲劳裂纹源由试样的边角或表面转移到试样的次表面和试样边角的内部，与原始试样的疲劳辉纹相比，强化试样的疲劳辉纹相对间隔比较大。

关键词: 磨料水射流, Inconel 690合金, 低周疲劳, 循环变形, 内应力

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

中图分类号:

TP69

王宁, 朱贤皓, 姚树磊, 武秋宇, 潘妃, 于浩, 张显程, 涂善东. 磨料水射流强化对Inconel 690合金低周疲劳性能的影响[J]. 机械工程学报, 2025, 61(24): 63-74.

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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