B. B. He, M. X. Huang. Strong and ductile medium Mn steel without transformation-induced plasticity effect[J]. Materials Research Letters, 2018, 6(7): 365-371.
DOI:
B. B. He, M. X. Huang. Strong and ductile medium Mn steel without transformation-induced plasticity effect[J]. Materials Research Letters, 2018, 6(7): 365-371.DOI: 10.1080/21663831.2018.1461141.
Strong and ductile medium Mn steel without transformation-induced plasticity effect
BSTRACTThe conventional alloy design of medium Mn steel is to optimize the transformation-induced plasticity (TRIP) effect. Here we show that a dual-phase heterogeneous structure is sufficient to develop a medium Mn steel with high yield strength (∼1.2 GPa) and large uniform elongation (∼14.5%). The ultra-high strength is contributed by high back-stress while the large ductility is induced by strain-gradient plasticity and back-stress hardening
both of which are inherent to dual-phase heterogeneous structure. TRIP effect is suppressed during plastic deformation. Therefore
medium Mn steel can be strong and ductile by engineering dual-phase heterogeneous structure without resorting to TRIP effect.
IMPACT STATEMENT
We demonstrate that medium Mn steel can be strong and ductile by engineering dual-phase heterogeneous structure without resorting to the conventional transformation-induced plasticity (TRIP) effect.
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a State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an People’s Republic of China
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