Effect of Laser Power on Microstructure and Properties of Ni-based Alloy Coatings on 30CrMnSiA Steel

• Published in: Journal of thermal spray technology Vol. 31; no. 7; pp. 2136 - 2146
• Main Authors: Yao, Kong, Zongde, Liu, Quanbing, Liu
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2022
• Subjects: Analytical Chemistry; Characterization and Evaluation of Materials; Chemistry and Materials Science; Corrosion and Coatings; Machines; Manufacturing; Materials Science; Peer Reviewed; Processes; Surfaces and Interfaces; Thin Films; Tribology; laser cladding; laser power; microstructure; corrosion resistance; Ni-based alloy
• ISSN: 1059-9630; 1544-1016
• DOI: 10.1007/s11666-022-01416-x

A Ni-based alloy powder with a composition of 24 Cr, 13 wt% Mo, and Ni balance was used in this study. The coatings were prepared by laser cladding at different laser powers on 30CrMnSiA steel substrates. The effect of laser power on the microstructure, element dilution rate, microhardness, and corrosion resistance of the coatings was investigated. The results showed that the coatings had a metallurgical bond with the substrate. The coatings mainly contained (Fe,Ni) solid solution and Cr0.19Fe0.7Ni0.11 phases. The Ni-based alloy coatings had a higher microhardness and better corrosion resistance than the 30CrMnSiA steel substrate. A decrease in laser power resulted in a finer grain size, lower element dilution rate, and higher microhardness. The coating prepared at a laser power of 2400 W showed the best corrosion resistance, with a higher corrosion potential and lower corrosion current density after immersion in 3.5% NaCl solution, because of a lower element dilution rate and better coating quality. In contrast, the coating prepared at 3000 W had a high porosity and poor corrosion resistance.