Solidification Structure and Tempering Characteristics of FeCrVNiC System Cast Alloys.pdf

Solidification Structure and Tempering Characteristics of Fe-Cr-V-Ni-C System Cast Alloys Yongqing Ma, Yang Zhang, Yanxia Liu, Zhanping Zhang, Yumei Dai, Tao Yu Dalian Maritime University Dalian, Liaoning, P. R. China 116026 myq@ Abstract The solidification structure of high vanadium and high chromium white cast iron containing nickel is mainly composed of matrix (martensite and retained austenite ),spherical carbide VC eutectic carbide M7C3 .The adding nickel have guaranteed that the as-cast structure of the matrix of high vanadium and high chromium white cast iron is martensite and austenite. The highest hardness can obtained by second hardening during the tempering at high temperature ( ～560 ℃),and the vigorous oxidation phenomenon during the quenching at very high temperature (900 ℃) can be avoided, which make the high vanadium and high chromium white cast iron become a kind of applied wear resistance material. When carbon content is 3.3% and nickel content is 0.8-1.2% in the alloy, the retained austenite in high vanadium and high chromium white cast iron is decomposed essentially by tempering at 560 ℃ and The highest hardness is HRC64. When lower carbon content in alloy, the highest tempering hardness decreases and the tempering temperature for the highest hardness also deceases. When higher nickel content in alloy