Construction of the gradient structure layer of 17-4PH steel based on laser shock peening and the influence on high-temperature friction performance

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Abstract
The high-temperature friction behavior of 17-4PH stainless steel (17-4PH SS) subjected to laser shock peening (LSP) was investigated through high-temperature friction tests and microstructural characterization. The residual stress distribution induced by LSP was determined by numerical simulation and subsequently validated by experimental measurements. The results indicate that LSP generated a gradient nanostructure and gradient residual compressive stress field near the specimen surface, which together constituted a gradient structural layer (GSL). During high-temperature friction process, the existence of GSL altered the microstructural evolution and stress state of the worn surface, resulting in a transition of the dominant wear mechanism from adhesive wear to abrasive wear, which contributed to the significantly improved wear resistance of 17-4PH SS.