期刊
MATERIALS & DESIGN
卷 49, 期 -, 页码 234-241出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2013.01.061
关键词
Martensitic transformation; Twinning-induced plasticity; Tension test; Cryogenic property; High Mn steel; Grain refinement
资金
- NIMS
- Japan Society for the Promotion of Science
Cryogenic mechanical properties of twinning-induced plasticity steels of various grain sizes were investigated by the tensile tests. Specimens with coarse grain sizes, e.g. 10, 23 and 37 mu m, showed a brittle fracture at 123 K. The embrittlement was suppressed by a grain refinement to 3.5 mu m by cold rolling and recrystallization. Furthermore, a grain refinement to 460 nm by warm caliber rolling suppressed the embrittlement more effectively compared with the grain refinement via cold rolling and recrystallization treatment. The grain refinements improved the tensile elongation, yield strength, and ultimate tensile strength significantly at 123 K. It was found that the suppression of the embrittlement was caused by the reductions in the amount of epsilon-martensite. (C) 2013 Elsevier Ltd. All rights reserved.
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