中文摘要：

利用3DEBSI）IFIB（three dimensional electron backscatter diffraction-focused ionbeam）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}，惯习面平行于奥氏体的{225），其初始形核及后期生长均在{225}，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）和{225}，初始形核和前期生长沿{225}，，后期生长沿（111），由于外加应力，其表面发生弯曲变形，形核时间不同，偏离{225），-{111}，程度不同。

英文摘要：

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.