Al0.25CoCrFeNiV High Entropy Alloy Coating Deposited by Laser Cladding on Stainless Steel

This paper studies the microstructure, composition and properties of a Al0.25CoCrFeNiV high entropy alloy coating (HEAC) deposited by laser cladding on austenitic-grade stainless steel. Laser cladding was carried out in an argon atmosphere on a FL-Clad-R-4 laser metal deposition complex with the following parameters: the laser power was 1400 W, the spot diameter was 3 mm, the track displacement was 1.2 mm, and the scanning speed was set to 10 mm/s. A change in the microstructure of the coating after laser cladding was revealed in comparison with as-cast high entropy alloy (HEA) Al0.25CoCrFeNiV. A significant decrease was found in the size of vanadium precipitates, from 20-40 mu m in the as-cast state to 1-3 mu m after laser cladding. A change in microhardness over the thickness of the coating from 370 HV0.3 at the outer surface to 270 HV0.3 at the boundary with the substrate was established, which may be due to the diffusion of Fe from the stainless steel into the coating material during laser cladding. Despite these features, the resulting coating adheres tightly to the substrate, and has no cracks or other defects, which indicates the possibility of using laser cladding to create coatings from high entropy alloys.

Automated summary

This paper investigates the microstructure, composition, and properties of an Al0.25CoCrFeNiV high entropy alloy coating deposited on austenitic-grade stainless steel by laser cladding. The study reveals changes in the microstructure and hardness of the coating after laser cladding, with a decrease in the size of vanadium precipitates and a variation in hardness across the coating thickness. However, the coating adheres tightly to the substrate without any cracks or defects, indicating the potential of laser cladding for creating high entropy alloy coatings.