高钒铁碳合金凝固过程及元素的分布

Solidification Process and Element Distribution of High Vanadium Fe-C Alloy

通过定向凝固 液淬试验、金相分析、电子探针面扫描、微区成分能谱分析和差热分析等手段,研究了高钒铁碳耐磨合金的凝固过程。结果表明:该合金在凝固时首先从液相中析出初生VC相;随着VC的析出,液相中V含量降低,达到共晶成分时,合金将发生共晶反应L→γ+MC;之后将按照L→γ+MC+MC2的反应进行三元共晶凝固。V主要分布于MC型的碳化物,Mo和Cr主要分布于MC2型的碳化物中。

The solidification process of a Fe-C alloy containing high vanadium is investigated through unidirectional solidification and quenching test with reference to metallographic and phase composition examination with OM,EDS EMPA and DTA.The results show that during the solidification,primary VC crystal separates out from liquid first and then eutectic reactions carry out in the sequence of L→γ+MC and L→γ+MC+MC-2.The V element exists mainly as MC carbide and the Mo and Cr elements as MC-2 carbide.