Effect of Laser Energy Density on Amorphous Phase Content and Properties of Fe-Based Amorphous Coatings

Amorphous coatings are widely used in industry due to their excellent physical and chemical properties. In this paper, Fe-Cr-Mo-C-B-Si amorphous coating was prepared on Q235 steel by coaxial powder feeding laser cladding. The coating had a maximum thickness of 1 mm, and the influence of the laser cladding parameters on the amorphous forming ability, microstructure, microhardness and wear resistance of the cladding layers was investigated. The results show that the amorphous phase content in the cladding layer is closely related to the laser energy density, and the amorphous phase content is positively correlated with the performance of the cladding layer. With the increase in laser energy density, the amorphous phase content, microhardness and wear resistance of the cladding layer all show a tendency to decrease after the initial increase. The cladding layer prepared at an energy density of 125 J/mm2 has the best wear resistance, mainly due to fine grain strengthening and amorphous strengthening.