The Effect of Cr on the Microstructure and Wear Resistance of Fe-Cr-V-C Hardfacing Alloys

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.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 1203-1206
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.1203
• Online since: May 2011
• Authors: Lin Zong, Zheng Jun Liu
• Keywords: Gas Tungsten Arc Welding (GTAW), Hard Phase, Microstructure, Wear Resistance

References

[1] Rongjiu Li: Ceramic - metal Composite (Metallrugical Industry press, China 2002)

[2] K.H. Ji, K.H. kang, D.N. Seung: Wear. Vol. 267(2009), p.1415

[3] Xinhong Wang, Zengda Zou, Sili Song: Wear. Vol. 260 (2006), p.705

[4] F. Chieh, M.C. Che, M. Chia and W. Wu: Surf. Coat. Technol. Vol. 201(2006), p.908

[5] Zhengjun Liu, Yunhai Su and Guiqng Zhang: Transactions of the china welding institution (In Chinese). Vol. 28(2007), p.45