Microstructural evolution of GCr15 steel during austenitizing and quenching considering C and Cr content  

作　　者：刘青龙 钱东升 魏文婷 

机构地区：[1]School of Materials Science and Engineering, Wuhan University of Technology [2]Hubei Key Laboratory of Advanced Technology for Automotive Components [3]School of Automotive Engineering, Wuhan University of Technology

出　　处：《Journal of Central South University》2016年第10期2492-2499,共8页中南大学学报（英文版）

基　　金：Project(51575414)supported by National Natural Science Foundation of China;Project(IRT13087)supported by the Innovative Research Team Development Program of Ministry of Education of China;Project(2015AAA005)supported by the project of Important Science and Technology Innovation Program of Hubei Province,China

摘　　要：Microstructural evolution of GCr15 steels with different C and Cr contents during austenitizing and quenching was studied. Thermodynamic analysis of cementite dissolution was implied to obtain the critical temperature. The coordination number x in Fe_xCr_(3-x)C and the volume fraction of undissolved cementite were computed according to element conservation and equilibrium phase diagram. The M_S(martensite transformation temperature) was calculated by using empirical formula. The retained austenite content was calculated with further consideration of quenching temperature. The results showed that the coordination number and the undissolved cementite content were promoted by the austenitizing temperature and carbon content of the steel. Increasing Cr element reduced the coordination number.GCr15 steels with different components had nearly the same M_S when austenitization at 830 °C to 860 °C. The interaction of C and Cr complicated the evolution of M_S and retained austenite content. The results were in good agreement with the literature, which could guide to obtain specified retained austenite and/or carbides.Microstructural evolution of GCr15 steels with different C and Cr contents during austenitizing and quenching was studied. Thermodynamic analysis of cementite dissolution was implied to obtain the critical temperature. The coordination number x in Fe_xCr_（3-x）C and the volume fraction of undissolved cementite were computed according to element conservation and equilibrium phase diagram. The M_S（martensite transformation temperature） was calculated by using empirical formula. The retained austenite content was calculated with further consideration of quenching temperature. The results showed that the coordination number and the undissolved cementite content were promoted by the austenitizing temperature and carbon content of the steel. Increasing Cr element reduced the coordination number.GCr15 steels with different components had nearly the same M_S when austenitization at 830 °C to 860 °C. The interaction of C and Cr complicated the evolution of M_S and retained austenite content. The results were in good agreement with the literature, which could guide to obtain specified retained austenite and/or carbides.

关 键 词：GCr15 steel AUSTENITIZATION QUENCHING thermodynamic calculation KINETICS 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.3[金属学及工艺—金属材料]