Microstructure and wear behavior of (Cr,Fe)7C3 reinforced composite coating produced by plasma transferred arc weld-surfacing process

• Published in: Surface & coatings technology Vol. 201; no. 3-4; pp. 863 - 867
• Main Authors: Liu, Yuan-Fu, Xia, Zhi-Ying, Man, Jian-Min, Zhang, Gu-Ling, Yang, Si-Ze
• Format: Journal Article
• Language: English
• Published: 05.10.2006
• ISSN: 0257-8972
• DOI: 10.1016/j.surfcoat.2005.12.048

A wear-resistant (Cr, Fe)7C3 carbide reinforced composite coating was fabricated on substrate of a 0.45% C carbon steel by plasma transferred arc (PTA) weld-surfacing process using Fe-Cr-C-Ni powder blends. The microstructure, microhardness and dry-sliding wear behavior of the composite coating were investigated using optical micrograph (OM), X-ray diffraction (XRD), scanning electron micrograph (SEM), energy dispersive X-ray analysis (EDS), microhardness tester and ring-on-ring wear tester. Results show that the composite coating consists of primary (Cr, Fe)7C3 as the reinforcing phase and interdendritic (Cr, Fe)7C3/gamma-Fe eutectics as the matrix. The composite coating is metallurgically bonded to the 0.45% C carbon steel substrate. The (Cr, Fe)7C3 carbide reinforced composite coating has high hardness and excellent wear resistance under dry sliding wear test conditions.