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

Abstract

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.

Keywords

GH4169 dovetail / LSPwC / LSP-CS / fretting fatigue life / high temperature

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