Abstract
Fe-Cr-V-C hardfacing alloys of three different Cr contents were produced by GTAW. The microstructure and hard phases morphology were investigated by means of OP, SEM and XRD. The results showed that the microstructure of hardfacing alloys consists of lamellar martensite, retained austenite, ferrite, VC particles and (Fe,Cr,V)7C3 complex carbides. The VC particles with exploded, globular shape and (Fe,Cr,V)7C3 complex carbides with interrupted netted, hexagonal shape are observed in the alloys.The amount of Cr affect the microstructure and wear resistance of the hardfacing coating. The volume fraction of (Fe,Cr,V)7C3 complex carbides increase as the Cr content increase. When the Cr content reached 22%, a multitude of hexagonal (Fe,Cr,V)7C3 complex carbides and a small amount globular VC particles are distributed in the softer ferrite and austenite matrix which ensure the high wear resistance.
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