EBSD在马氏体变体间位向关系测定中的应用  

Study on the orientational relationship between martensite variants by EBSD

作　　者：张美汉[1] 许为宗[1] 郭正洪[1] 王晓东[1] 戎咏华[1] 

机构地区：[1]上海交通大学材料科学与工程学院,上海200240

出　　处：《电子显微学报》2010年第1期63-68,共6页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.50771110)

摘　　要：利用EBSD研究了0.33wt.%C碳钢中原奥氏体同一晶粒内的板条马氏体的形态和晶体学特征。在无残留奥氏体的情况下,由于EBSD检测结果的分散性,用对称性高的低指数极图(如{001}bcc极图)并不能很好地区分K-S取向关系和N-W取向关系。本文采用非对称性的高指数{123}bcc极图,可以区分两种取向关系。结果表明,此材料的马氏体取向分布基本符合K-S关系。利用极图与矩阵运算的方法,标定原奥氏体同一晶粒内24个满足K-S关系的变体,揭示了24个马氏体变体间特定的结合规律。Electron backscattering diffraction（EBSD） attachment in scanning electron microscopy is used to analyze morphologies and crystallographical choracteristics of lath martensite within a prior austensite grain in 0.33 wt.%C carbon steel.Without the presence of retained austensite,pole figure with high symmetric and low-index directions（such as {001}_（bcc） pole figure）,cannot distinguish the K-S orientation relationship from N-W one well,because of disperse of the EBSD scanning results.Pole figure with asymmetric and high-index directions （such as {123}_（bcc） pole figure） is used to solve this problem.The result indicates that the martensite maintains the K-S orientation relationship.The pole figure and the matrix can be used to identify the 24 variants of K-S orientation,and specific combinations of the 24 variants are discovered.

关 键 词：板条马氏体 位向关系 晶体学 EBSD 取向差 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG115.215.3[金属学及工艺—金属材料]