Regular Article

Phase diagram calculation and analyze on cast high vanadium wear-resistant alloy

¹ School of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, P.R. China
² Powder Metallurgy Research Institute, Central South University, Changsha 410012, Hunan Province, P.R. China

^⁎ e-mail: hgfu@bjut.edu.cn

Received: 19 June 2016
Received in final form: 8 November 2016
Accepted: 9 January 2017

Abstract

The equilibrium-solidified phase diagrams of high vanadium wear-resistant alloy with different vanadium concentration have been calculated. The vertical section of Fe–C, Fe–V pseudo-binary phase diagrams and the transformation diagrams of phases have been drawn by the Thermo-Calc software. The effects of vanadium on the phase diagram and solidification microstructure have been investigated by optical microscopy, scanning electron microscopy, EDS, XRD and differential scanning calorimetry (DSC). The results show that the parameter of eutectic transformation and the phase regions are changed significantly with the increase of vanadium concentration. The solidification structure includes α-Fe, MC-type, M₇C₃-type and M₃C-type carbides. Vanadium element is mainly distributed over MC-type carbides. The MC-type carbides morphology changes from strip and short rod to spherical and lumpy with the increase of vanadium concentration. The DSC, solidification structure and XRD results are agreed with the ones from calculation.