CRYSTALLOGRAPHIC BEHAVIORS OF COMPRESSED HIGH MANGANESE TRIP/TWIP STEELS ANALYZED BY EBSD TECHNIQUES
II. MartensiticMisorientations, the Evolution of Martensitic Orientations and the Influence of Austenitic Orientations
YANG Ping; LU Fayun; MENG Li; CUI Feng’e
School of Materials Science and Engineering; University of Science and Technology Beijing; Beijing 100083
Cite this article:
YANG Ping LU Fayun MENG Li CUI Feng’e. CRYSTALLOGRAPHIC BEHAVIORS OF COMPRESSED HIGH MANGANESE TRIP/TWIP STEELS ANALYZED BY EBSD TECHNIQUES
II. MartensiticMisorientations, the Evolution of Martensitic Orientations and the Influence of Austenitic Orientations. Acta Metall Sin, 2010, 46(6): 666-673.
In this paper, deformation behaviors of two kinds of martensites (hexagonal and bcc structures) and the influence of austenitic orientations on martensitic transformation in high manganese TRIP/TWIP (transformation–induced plasticity/twinning–induced plasticity) steels during compression were analyzed by EBSD technique. Results showed that, in hexagonal martensites low angle grain boundaries caused by slip and special misorientations such as 93°<7253> were detected in addition to those inherited due to orientation relationship. In bcc martensite, low angle misorientations due to slip were dominant in addition to the special misorientations between α′–M variants or those inherited from austenitic twinsBesides, austenitic orientations affected phase transformation and it was observed that martensite was induced faster in austenitic grains of {110}γ orientation than that of {100}γ orientation. α′–M orientation changed more obviously in {110}α' oriented grains because they were unstable during compression. The reasons for the formation of new special misorientations in hexagonal martensite and the influence of austenitic orientation were discussed.
Supported by National Natural Science Foundation of China (No.50771019) and Specialized Research Fund for the Doctoral Program of Higher Education (No.20090006110013)
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