含硅钢下贝氏体长大方式——65Si2MnWA 下贝氏体界面位错  

The Growth Mode of Lower Bainite in a Si Containing Steels ——The Dislocations in Lower Bainite/Austenite Interface for 65Si2MnWA Steel

作　　者：张喜燕[1] 武小雷[2] 康沫狂[3] 

机构地区：[1]西南交通大学材料工程系 [2]中国科学院力学研究所材料研究中心 [3]西北工业大学材料学院

出　　处：《西南交通大学学报》1998年第3期257-262,共6页Journal of Southwest Jiaotong University

摘　　要：利用透射电镜观察研究含硅钢６５Ｓｉ２ＭｎＷＡ下贝氏体界面位错。结果表明，该钢下贝氏体界面错配位错为混合型位错，真实位错线方向与其柏氏矢量夹角约为３０°，界面可借助错配位错沿界面法线方向作保守滑移。发现界面位错有穿过界面的情况。提出了下贝氏体界面位错环模型，根据此模型，可以预测随着位错环的扩展，其螺型部分导致下贝氏体铁素体的增厚，刃型部分导致伸长，由于刃型位错滑移速度远高于螺型位错滑动速度，伸长快于增厚，贝氏体呈片状。The dislocations in lower bainite/austenite interface for 65Si2MnWA steel is investigated with TEM.The results show that the dislocations are of Burgers vectors b=(a /2) BF with a degree of 30° from the real dislocation line,and the interface is slip.The phenomenon of the dislocations passing through the interface is also observed.A model of IMDL (interfacial misfit dislocation loop) is proposed.Bainite grows with expanding of IMDL.The screw part of IMDL results in the thickening of bainite, and the edge part results in the lengthening.The lower bainite exhibits plate shape because of lengthening is faster than thickening.

关 键 词：位错 贝氏体 马氏体 奥氏体 固态相变 硅钢 

分 类 号：TG142.77[一般工业技术—材料科学与工程]