Effect of Substrate Temperature on the Cold-sprayed 316L Stainless Steel Coatings

In this study, isolated impacted of 316L stainless steel particles were obtained on polished stainless steel substrates at different preheating temperatures of substrate. They were analysed in regard with their deformation and their melting. In addition, the corresponding coatings were formed at the same conditions, and the influences of the substrate preheating temperature on the microstructure, bonding strength and microhardness of coatings were investigated. Finite element analysis was conducted in order to reveal the evolution of particle deformation and bonding interface based on the substrate preheating temperature. The results revealed that the preheated substrate showed more deformation than the no-preheated one, which contribute to denser microstructure and higher microhardness. For high temperature substrate, substrate preheating promotes the occurrence of interfacial melting, more prominent metal jet at the rim of the interface were discovered, which enhances the bonding between particles and substrate.