Abstract
Laser shock peening (LSP), as an innovative surface treatment technology, can effectively improve fatigue life, surface hardness, corrosion resistance, and residual compressive stress. Compared with laser shock peening, warm laser shock peening (WLSP) is a newer surface treatment technology used to improve materials’ surface performances, which takes advantage of thermal mechanical effects on stress strengthening and microstructure strengthening, resulting in a more stable distribution of residual compressive stress under the heating and cyclic loading process. In this paper, the microstructure of the GH4169 nickel superalloy processed by WLSP technology with different laser parameters was investigated. The proliferation and tangling of dislocations in GH4169 were observed, and the dislocation density increased after WLSP treatment. The influences of different treatments by LSP and WLSP on the microhardness distribution of the surface and along the cross-sectional depth were investigated. The microstructure evolution of the GH4169 alloy being shocked with WLSP was studied by TEM. The effect of temperature on the stability of the high-temperature microstructure and properties of the GH4169 alloy shocked by WLSP was investigated.
Highlights
The nickel-based superalloy has been widely used as turbine blade and disk link material in aircraft, mainly due to its excellent thermal mechanical properties stability, such as thermal fatigue, rupture ductility, oxidation resistance, and creep strength
For the purpose of evaluating the stability of the samples processed by Laser shock peening (LSP) and warm laser shock peening (WLSP), the residual stress at different temperatures was measured by the XRD method, and the results are illustrated in Figure 5
The microstructure of the GH4169 nickel superalloy processed by WLSP technology with different laser parameters was investigated
Summary
The nickel-based superalloy has been widely used as turbine blade and disk link material in aircraft, mainly due to its excellent thermal mechanical properties stability, such as thermal fatigue, rupture ductility, oxidation resistance, and creep strength. Compared with the traditional LSP technology, WLSP is carried out at high temperature rather than room temperature This in turn can achieve multifaceted mechanical performance optimization [6,7,8]. The density of the dislocation structure can be improved, and a more stable residual compressive stress can be achieved by WLSP This effectively suppresses the effect of high-temperature instability and improves the high-temperature stability of the material surface’s residual compressive stress layer, which is beneficial to the improvement of fatigue life. Few efforts have been put on investigations on improving the surface structure stability and high-temperature service performance of the GH4169 superalloy by the WLSP technique [15,16,17]. The effect of temperature on the stability of the high-temperature microstructure and properties of the GH4169 alloy processed by WLSP was investigated
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