Scholarlink

<p>The effects of nanosecond laser shock peening without coating (LSPwC) and nanosecond stacked femtosecond laser shock peening compound strengthening (LSP-CS) on the surface integrity and fretting fatigue lifetime at 500 °C of GH4169 dovetail component were investigated. The results show that LSP treatment does not significantly lead to changes in the grain size of GH4169 alloy, but it introduces a large number of dislocations, resulting in the formation of a plastic deformation layer and residual compressive stress layer. The surface microhardness increased by 20.5% and 28.6% after being treated by LSPwC and LSP-CS, respectively. The surface residual compressive stresses were (−306.5±42.5) MPa and (−404.3±34.7) MPa, respectively; The depth of both the hardening layer and the residual compressive stress layer is 400 µm, and along the cross-section with 0–100 µm region after LSP-CS treatment has higher hardness and greater residual compressive stress. The fretting fatigue lifetime of the GH4169 dovetail component at 500 °C was increased by 346.8% and 494.9%, which is the result of the combined effects of the hardening layer and the residual stress layer. The LSP-CS treatment can effectively make up for the disadvantage of the LSPwC treatment, and further enhance the fretting fatigue lifetime of the GH4169 dovetail component at high temperature.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Improvement of fretting fatigue lifetime at 500 °C of GH4169 dovetail component treated by nanosecond stacked femtosecond laser shock peening

  • 期刊论文

  • 发表日期：

    2025年7月1日

查看全文
  • Xiu-yang Fang,
  • Zheng Wang,
  • Jian-en Gong,
  • Zhi-guo Wang,
  • Tai-li Chen,
  • Jing Ni,
  • Zhen-bing Cai

摘要

The effects of nanosecond laser shock peening without coating (LSPwC) and nanosecond stacked femtosecond laser shock peening compound strengthening (LSP-CS) on the surface integrity and fretting fatigue lifetime at 500 °C of GH4169 dovetail component were investigated. The results show that LSP treatment does not significantly lead to changes in the grain size of GH4169 alloy, but it introduces a large number of dislocations, resulting in the formation of a plastic deformation layer and residual compressive stress layer. The surface microhardness increased by 20.5% and 28.6% after being treated by LSPwC and LSP-CS, respectively. The surface residual compressive stresses were (−306.5±42.5) MPa and (−404.3±34.7) MPa, respectively; The depth of both the hardening layer and the residual compressive stress layer is 400 µm, and along the cross-section with 0–100 µm region after LSP-CS treatment has higher hardness and greater residual compressive stress. The fretting fatigue lifetime of the GH4169 dovetail component at 500 °C was increased by 346.8% and 494.9%, which is the result of the combined effects of the hardening layer and the residual stress layer. The LSP-CS treatment can effectively make up for the disadvantage of the LSPwC treatment, and further enhance the fretting fatigue lifetime of the GH4169 dovetail component at high temperature.