The effect of a coating heat-treatment on Cr-Si and heat-treatment on the mechanical properties of Cr17Ni2 stainless steel

摘要

The in-situ co-deposition of Cr-Si into Cr{sub}17Ni{sub}2 stainless steel (similar to AISI 431) was achieved using a pack cementation process. Through the optimum parameters, a coating containing approximately 27 wt.％Cr and 2 wt. ％Si was obtained, with a layer thickness of approximately 120μm. Studies showed that the thermal treatment of the coating resulted in a reduction of tensile strength, but the improvement of impact toughness, although the coating had little effect on the mechanical properties of the bulk. Tempering at 300 or 450℃ improved the tensile strength and the impact toughness of the steel at 9 and - 55℃, while tempering at 550℃ reduced these mechanical properties.