ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Prediction of Carbide Precipitation Using Partial Equilibrium Approximation in Fe–C–V–W–Cr–Mo High Speed Steels
Hongwei ZhangKeiji NakajimaCharles-André GandinJicheng He
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2013 Volume 53 Issue 3 Pages 493-501


In Fe–C–V–W–Cr–Mo high speed steels, the nature of carbides during the solidification are discussed as a function of C, V and W content by the help of Partial Equilibrium (PE) approximation and thermodynamic calculations. The results show that the solidification path and carbide precipitation can be reasonably predicted by the Partial Equilibrium approximation for cooling rate lower than 10–13 K min–1. From the viewpoint of hardness control by carbides, it is found that among the main carbides MC, M6C and M7C3, the increase of C favours the formation of MC, M7C3 but decreases the hardness of M7C3 by increasing the Fe content in it. Meanwhile, the increase of V only increases the amount of MC and V content therein, and the increase of W largely increases the amount of M6C and W content in it. As a result, the addition of V and W improves the hardness of MC and M6C carbides.

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© 2013 by The Iron and Steel Institute of Japan
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