钢中马氏体的孪晶亚结构  

Twin crystal substructure of martensite in steel

作　　者：计云萍[1] 刘宗昌[1] 任慧平[1] 

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《材料热处理学报》2013年第4期162-165,共4页Transactions of Materials and Heat Treatment

摘　　要：采用JEM-2100高分辨透射电镜观察了含0.029%La纯铁、40Cr、60Si2CrV、W6Mo5Cr4V2和Mn13钢的马氏体组织形貌,并对马氏体组织中的孪晶亚结构的形成机制进行了探讨。研究表明:从超低碳钢到高碳钢,淬火马氏体中均有相变孪晶出现,随着奥氏体中碳含量的提高则马氏体中相变孪晶增加。孪晶亚结构的形成与马氏体相变应变能有关,随着转变温度降低,应变能增大,形成精细孪晶以调节应变能。The twin crystal substructure of martensite in pure iron containing 0. 029% La, 40Cr, 60Si2CrV, W6MoSCr4V2 and Mn13 steels was observed by JEM-2100 high resolution transmission electron microscope and it formation mechanism was discussed. The results show that from ultra-low carbon steel to high carbon steel, the phase-transformation twin crystal can all form in the quenched martensite and it increases with the increasing of the carbon content in austenite. It is considered that the formation of the twin crystal substructure is related to the strain energy of martensite phase transformation. With the decrease of the temperature of martensite phase transformation,the strain energy increases, and the fine twin crystal comes into being in order to adjust the strain energy.

关 键 词：马氏体 孪晶 高分辨电镜 应变能 

分 类 号：TG113.12[金属学及工艺—物理冶金]