V和Ti对过共晶高铬铸铁组织和性能的影响

Effects of Vanadium and Titanium on the Microstructures and Performances of Hypereutectic High-Chromium Cast Iron

研究了Ti和V对过共晶高铬铸铁(25.0%Cr,3.5%C)显微组织和力学性能的影响。结果表明,V只能细化共晶碳化物;随着Ti含量的增加,初生M_7C_3碳化物和共晶碳化物都具有明显的细化特征。组织中的初生碳化物和共晶碳化物的硬度随着Ti含量增加而增加,冲击韧度有一定提升。高铬铸铁的耐磨性能随着Ti含量的增加而增加。

The effect of titanium and vanadium on the microstructure and mechanical properties of hypereutectic high-chromium cast iron with 25.0 wt%Cr and 3.5 wt%C was studied. The results show that the vanadium can only refine eutectic carbides. The primary M7C3 carbides and eutectic carbides could be refined obviously with the increase of titanium content. The hardness of primary carbides and eutectic carbides increases with the increase of titanium content, and the impact toughness is improved at a certain extent. The wear resistance of high-chromium cast iron increases with the increase of titanium content.