Experiments and Calculations on Refining Mechanism of NbC on Primary M7C3 Carbide in Hypereutectic Fe-Cr-C Alloy

摘要：

　　The microstructures of two hypereutectic Fe-Cr-C hardfacing alloys whose Nb contents are 0 and 1.2 wt.%respectively were observed,in which the primary M7C3 carbides in the alloy with Nb are obviously refined.The melting behaviors of M7C3 embryos with different radii were simulated,and the solid-liquid interfacial energy of M7C3 carbide was calculated to be 3.312J/m2 based on the classical nucleation theory.Two kinds of M7C3(0001)/NbC(111)interface models were built.By means of first-principles calculations,their works of adhesion are 1.23J/m2 and 2.24 J/m2 respectively.There exists a region where the interfacial energy of interface II is lower than the solid-liquid interfacial energy of M7C3 carbide.The above experimental and calculation results demonstrate that NbC particle is the heterogeneous nucleus of primary M7C3 carbide and thereby refines it.

关键词： M7C3 carbide grain refinement molecular dynamics first-principles heterogeneous nucleus

作者: LIU Sha WANG Zhijie SHI Zhijun ZHOU Yefei YANG Qingxiang

作者单位: State Key Laboratory of Metastable Materials Science & Technology,Yanshan University,Qinhuangdao 066 State Key Laboratory of Metastable Materials Science & Technology,Yanshan University,Qinhuangdao 066

会议类型: 国际会议

会议名称: STEELSIM2017(第七届冶金过程及钢铁材料模拟及仿真国际会议)

会议地点: 青岛

会议语种:英文

页码: 339-342

在线出版日期: 2017-08-16（万方平台首次上网日期，不代表论文的发表时间）