Laser-clad Inconel 625 coatings on Q245R structure steel: microstructure, wear and corrosion resistance

• Main Authors: Ding, Y. (Author), Gu, J. (Author), Gui, W. (Author), Liang, Y. (Author), Lin, J. (Author), Qin, J. (Author), Qu, Y. (Author), Wang, X. (Author), Wu, T. (Author), Zhong, C. (Author)
• Format: Article
• Language: English
• Published: Nature Publishing Group 2022
• Subjects: Corrosion resistance; Corrosion resistant coatings; Dilution rate; High speed laser; Inconel 625; Laser clad; Laser cladding; Laser cladding technique; Microstructure wear; Steel corrosion; Steel microstructure; Structure steels; Textures; Wear and corrosion resistance; Wear of materials; Wear resistance; XRD
• Online Access: View Fulltext in Publisher
• ISBN: 23972106 (ISSN)
• DOI: 10.1038/s41529-022-00247-z

In this work, ultra-low dilution rate Inconel 625 coatings with a thickness of ~534.4 μm were prepared by high-speed laser cladding technique on the Q245R steel. The XRD and TEM results show that the Inconel 625 coatings are mainly composed of the Nb and Mo-enriched laves phase with hexagonal close-packed (HCP) structure and the γ-Ni phase with face-centered-cubic (FCC) structure. The cellular crystal, column crystal, and equiaxed dendritic crystal were observed in the bottom, middle, and top of the Inconel 625 coatings from SEM results, respectively. The wear resistance and corrosion resistance of Q245R steel are significantly improved by high-speed laser cladding Inconel 625 coatings. In addition, the low dilution rate is beneficial for improving the wear and corrosion resistance of high-speed laser cladding Inconel 625 coatings. These findings may provide a method to design the wear and corrosion resistance of coatings on steel's surface. © 2022, The Author(s).