abstract
- Some applications of duplex stainless steels (DSS) demand wear resistance. To meet this requirement, innovative surface treatments are being implemented. The aim of this paper is to study the effects of laser shock peening without coating (LSPwC) on the microstructure of DSS SAF 2507 and its related tribological behavior. For this purpose, residual stress, roughness, microhardness and microstructure were evaluated. Tribological ball-on-disk tests were performed at room temperature, without lubricant and at constants speed and load using alumina balls as counterpart. LSPwC induces surface oxidation and compressive residual stresses (CRS), but it does not produce appreciable changes in roughness, microhardness or microstructure. During sliding, oxide particles caused an abrasive wear mechanism which is more pronounced in the AR material. The LSPwC material exhibits lower COF, weight loss and specific wear rate than the AR one. This could be rationalized by the earlier establishment of a protective CRS field in LSPwC material. © 2025