Department of Materials, Huazhong University of Science and Technology, 430074 Wuhan, Hubei, People's Republic of China
Abstract:
An investigation is reported of the laser surface cladding of self-fluxing Fe---Cr---Ni---B---Si alloys on a medium carbon steel substrate using the preplaced powder method. The cracking susceptibility and microstructure of the laser-cladding layer have been studied in terms of its Ni content, thermal expansion coefficient and wettability on the substrate. With increasing Ni content the cracking susceptibility of the cladding layer decreases and its microstructure changes from a “bamboo leaf” structure to a typical dendritic one.