Microstructure and Wear Resistance of Fe-Cr-C Hardfacing Alloy Reinforced by Titanium Carbonitride

摘要

In order to improve the wear resistance of Fe-Cr-C hardfacing alloy, titanium carbonitride was introduced in situ and a TiC-Ti-x(C,N)(y) coating was deposited on the surface of ASTM G3101 steel by a gas metal arc welding process. The microstructure and wear resistance of the hardfacing layer were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDS), macroscopic hardness meter, spectrometry, and transmission electron microscopy (TEM). The results show that the hardfacing layers mainly consist of (Cr,Fe)(7)C-3, TiC carbides, Ti-x(C,N)(y) carbonitrides, and alpha-Fe (C0.14Fe1.86 and C0.12Fe1.88 martensite) (BCT) in addition to a low content of retained CFe15.1 austenite (FCC). The titanium carbonitride-reinforced coating has high hardness and excellent wear resistance under dry sliding wear test conditions.