Mesostructured composite coating on SAE 1045 carbon steel synthesized in situ by laser surface alloying

摘要

Mesostructured composite coating was successfully synthesized in situ by laser surface alloying of copper (LSA) on SAE 1045 carbon steel. The microstructure in the alloyed zone consists of a randomly interconnected two-phase network: the phase is a-Cu in the bright region and it is α-Fe in the dark region. This is believed to be due to the occurrence of the liquid spinodal decomposition (LSD) before crystallization in the alloyed zone caused by high cooling rate.