|About this Abstract
||Materials Science & Technology 2012
||Steel Product Metallurgy and Applications
||Effect of Stress on Variant Selection of Lath Martensite in Low-Carbon Steel
||Yamato Mishiro, Shoichi Nambu, Junya Inoue, Toshihiko Koseki
|On-Site Speaker (Planned)
The effect of stress on the selection of variant during martensitic transformation in a low-carbon steel was investigated. The steel was fully austenitized and then continuously cooled, and when the temperature reached just above the martensite start (Ms) temperature, uniaxial compressive stress was applied. It was demonstrated that specific variants of lath martensite were preferentially selected under the compressive stress in the blocks of martensite larger than the average block size, while the martensite maintaining the Kurdjumov-Sachs (K-S) orientation relationship with prior austenite. External work done during the transformation was evaluated from the transformation strain and the applied stress, and it was indicated that the variants with greater external work were more likely to be selected. The shift of Ms temperature and the selected variants suggested that the transformation strain controlling the variant selection was not the shape strain but the invariant line strain.
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