板条状马氏体形貌和惯习面的3D EBSD分析  

3D EBSD Analysis of Morphology and Habit Plane for Lath Martensite

作　　者：王会珍[1] 杨平[1] 毛卫民[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料工程》2013年第4期74-80,共7页Journal of Materials Engineering

基　　金：高等学校博士学科点专项科研基金资助项目(20090006110013)

摘　　要：利用3D EBSD-FIB(three dimensional electron backscatter diffraction-focused ion beam)技术,以高锰钢为实验材料,构建晶粒三维立体形貌,并对马氏体惯习面进行观察分析。结果表明:热致板条状马氏体表面平直,接近马氏体的{110}α,惯习面平行于奥氏体的{225}γ,其初始形核及后期生长均在{225}γ上进行;而形变诱发形成的板条状马氏体表面和惯习面分布近于{021}α和{225}γ,初始形核和前期生长沿{225}γ,后期生长沿{111}γ,由于外加应力,其表面发生弯曲变形,形核时间不同,偏离{225}γ-{111}γ程度不同。The 3D morphology of lath martensite was reconstructed, and its habit plane was analyzed in high manganese steels, using a system of 3D EBSD-FIB （three dimensional electron backscatter dif- fraction- focused ion beam）. The results show that the surfaces of thermally-induced lath martensite are straight and close to martensitic {110}o, and the habit planes are close to austenitic {225}~; the di- rections of initial nucleation and the later growth are along { 225 }~ plane. The surfaces and the habit planes of deformation-induced lath martensite are on the verge of {021}. and {225}~, respectively; the nucleation and early growth are along {225}7, while later growth planes are changed to { 111}7 ; be- cause of the external stress, its surfaces are flexuous, and the degree of the deviations of the ones with {225}^-{111}v is various with nucleation time.

关 键 词：高锰钢 3D-EBSD-FIB 板条状马氏体 三维立体形貌 惯习面 

分 类 号：TG142.33[一般工业技术—材料科学与工程] TG115[金属学及工艺—金属材料]