Effect of Laser Parameters on the Microstructure and Properties of CoCrFeNiMn High Entropy Alloy Coatings

To explore the effects of laser processing variables on the macroscopic appearance, microstructural makeup, and functional properties of high-entropy alloy (HEA) coatings, CoCrFeNiMn coatings were deposited onto the surface of Q235 steel via laser cladding, with adjustments made to parameters like laser power and scanning speed. The research findings indicate that augmenting laser power leads to a concurrent increase in the coating's depth, width, and dilution rate. Conversely, when the scanning speed is escalated, there is a noticeable reduction in both the width and height of the coating. The coating predominantly consists of a single FCC phase structure; the microstructure is a typical organization of columnar and equiaxed crystals. The microhardness of the coating prepared under different parameters exceeds that of the substrate. Coatings prepared at 1.2 kW and 800 mm/min exhibit high hardness and exceptional wear resistance, with abrasive wear as the predominant wear mechanism.