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<p>The study investigated the impact of laser shock peening (LSP) on the high cycle fatigue (HCF) performance of MAR-M247, while also discussing the strengthening mechanisms in conjunction with microstructural evolution and numerical simulations. The LSP introduced a hardened layer with a depth of approximately 260&#xa0;μm, and the surface hardness increased by 27.2% compared to the base material (BM). Numerical simulation results indicated that LSP generated a Compressive residual stress (CRS) layer with a depth of about 250&#xa0;μm in the surface region, with a maximum average CRS of 409&#xa0;MPa. In the severe plastic deformation (SPD) layer, the improvement in hardness relied on the combined effects of grain refinement and high dislocation density. As the depth increased, in the moderate plastic deformation (MPD) layer, the enhancement in hardness was solely dependent on dislocation density and gradually diminished with increasing depth. The results showed that under peak stresses of 200&#xa0;MPa and 300&#xa0;MPa, the average HCF life increased by 216% and 286%, respectively, compared to the BM, due to the key factors of LSP induced gradient dislocation structures, grain refinement, and CRS.</p>

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Mechanistic investigation of laser shock peening on high cycle fatigue behavior and microstructural evolution in MAR-M247 nickel based superalloy

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Yunqing Jiang,
  • Tongfei Zou,
  • Shengyu Ni,
  • Tunan ZhangYu,
  • Yubing Pei,
  • Hong Zhang,
  • Yongjie Liu,
  • Liming Lei,
  • Qingyuan Wang

摘要

The study investigated the impact of laser shock peening (LSP) on the high cycle fatigue (HCF) performance of MAR-M247, while also discussing the strengthening mechanisms in conjunction with microstructural evolution and numerical simulations. The LSP introduced a hardened layer with a depth of approximately 260 μm, and the surface hardness increased by 27.2% compared to the base material (BM). Numerical simulation results indicated that LSP generated a Compressive residual stress (CRS) layer with a depth of about 250 μm in the surface region, with a maximum average CRS of 409 MPa. In the severe plastic deformation (SPD) layer, the improvement in hardness relied on the combined effects of grain refinement and high dislocation density. As the depth increased, in the moderate plastic deformation (MPD) layer, the enhancement in hardness was solely dependent on dislocation density and gradually diminished with increasing depth. The results showed that under peak stresses of 200 MPa and 300 MPa, the average HCF life increased by 216% and 286%, respectively, compared to the BM, due to the key factors of LSP induced gradient dislocation structures, grain refinement, and CRS.