期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 27, 期 3, 页码 257-265出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/S1005-0302(11)60059-5
关键词
High manganese steel; Martensite; TRIP effect; Orientation relationship; Electron backscattered diffraction (EBSD)
资金
- National Natural Science Foundation of China [50771019]
- Specialized Research Fund for the Doctoral Program of Higher Education [20090006110013]
Strain-induced martensites in high manganese TRIP/TWIP steels were investigated in the presence of thermal martensites and under the influence of austenitic grain orientation by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD). Before deformation, the morphology of alpha'-M depended mainly on the number of variants and growing period. Regardless of martensite morphologies and deformation, the Kurdjumov-Sachs (K-S) orientation relationships always maintained. The 6 alpha'-M variants formed from a plate of epsilon-M were of 3 pairs of twins with a common axis < 110 >(alpha') parallel to the normal of {111}(gamma) habit plane to minimize transformation strain. When alpha'-M could be formed only by deformation, it nucleated at the intersection of e-M variants and grew mainly in thick epsilon-M plates. Thick epsilon plates promoted significantly the alpha'-M and weakened the influence of grain orientations. During tension, the transformation in < 100 >-oriented grains was observed to be slower than that in < 111 >-oriented grains. Deformation twins promoted epsilon-M formation slightly and had no apparent effect on alpha'-M. Deformation increased the number of epsilon-M variants, but reduced that of alpha'-M variants.
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