Process of Laser Cladding of Iron-Based Amorphous Alloy Composite Coatings

In this study, an Fe-based amorphous alloy composite coating was deposited on the In this study, Fe-based amorphous alloy composite coatings were deposited onto Q235 steel substrates via laser cladding. The influence of laser power on coating morphology, dilution rate, phase evolution, microstructure, thermal stability, and mechanical response was systematically characterized using XRD, SEM, DSC, and Vickers microhardness testing. The coatings consist predominantly of α-Fe, Cr/Mo-enriched carbide/boride precipitates, and an amorphous matrix. Laser power markedly affects both dilution and amorphous-phase retention; 1200 W emerges as the optimal parameter within the studied range, yielding an estimated amorphous content of 24.04 %, a crystallization onset temperature of 732 K, and an α parameter of 0.618-collectively indicating superior thermal stability. The maximum microhardness reaches 1480 HV in the central coating region, roughly ninefold that of the Q235 substrate, attributed to synergistic grain refinement and homogeneous dispersion of strengthening precipitates. These findings offer both a mechanistic understanding and a practical parameter reference for industrial deployment of laser-cladded Fe-based amorphous composite coatings with enhanced wear and corrosion resistance.