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<p>In this study, the residual stress relaxation (RSR) and surface microstructure in turbine disk alloy FGH4098 processed by laser shock peening (LSP) were measured using X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The residual stress field and work hardening field were constructed using the inverse eigenstrain method and equivalent plastic strain method respectively, and then the cyclic deformation and the RSR of LSP FGH4098 alloy were simulated by Chaboche viscoplastic constitutive model. The modified Smith-Watson-Topper (SWT) model was employed to predict the fatigue life of LSP FGH4098 by taking the influence of RSR. The results indicate that the RSR can be appropriately up to 50 % in the first cycle, with more significant relaxation within 0.7 mm at the surface, then relaxes slowly in subsequent cycles until it stabilizes. Meanwhile, the reconstructed initial residual stress field is consistent with the experimental result, and the RSR behavior with loading cycles is successfully simulated and the predicted fatigue life falls within the 1.5× scatter band of the experimental fatigue life. Compared to the conventional fatigue life prediction without considering the influences of RSR, the proposed method can significantly enhance the accuracy of life prediction and is of great importance for improving the fatigue life design of turbine disks and their durability assessment.</p>

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Simulation of residual stress relaxation and fatigue life prediction of laser shock peened FGH4098 nickel-based alloy

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Ranxin Wang,
  • Rong Jiang,
  • Jingpeng Zhang,
  • Sihai Luo,
  • Chao You,
  • Yingdong Song

摘要

In this study, the residual stress relaxation (RSR) and surface microstructure in turbine disk alloy FGH4098 processed by laser shock peening (LSP) were measured using X-ray diffraction (XRD) and electron backscatter diffraction (EBSD). The residual stress field and work hardening field were constructed using the inverse eigenstrain method and equivalent plastic strain method respectively, and then the cyclic deformation and the RSR of LSP FGH4098 alloy were simulated by Chaboche viscoplastic constitutive model. The modified Smith-Watson-Topper (SWT) model was employed to predict the fatigue life of LSP FGH4098 by taking the influence of RSR. The results indicate that the RSR can be appropriately up to 50 % in the first cycle, with more significant relaxation within 0.7 mm at the surface, then relaxes slowly in subsequent cycles until it stabilizes. Meanwhile, the reconstructed initial residual stress field is consistent with the experimental result, and the RSR behavior with loading cycles is successfully simulated and the predicted fatigue life falls within the 1.5× scatter band of the experimental fatigue life. Compared to the conventional fatigue life prediction without considering the influences of RSR, the proposed method can significantly enhance the accuracy of life prediction and is of great importance for improving the fatigue life design of turbine disks and their durability assessment.