Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 724, Issue -, Pages 11-16Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2018.03.065
Keywords
Medium Mn steel; TRIP; TWIP; Austenite; Precipitates
Categories
Funding
- National Natural Science Foundation of China [U1764252, U1560204]
- Research Grants Council of Hong Kong [17255016, 17203014, C7025-16G]
- Ministry of Science and Technology of the Republic of China [MOST-104-2218-E-002-022-MY3]
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In general, medium Mn transformation-induced plasticity (TRIP) steels have a low yield strength due to soft ferrite matrix. Here we provide a strategy to improve the yield strength of medium Mn steels by coupling multiple strengthening defects in an austenite matrix. Such strengthening defects include V-precipitates, intragranular ferrite, forest dislocations and nano-twins. Consequently, the present medium Mn steel has an ultrahigh yield strength of 1350 MPa due to the collective contribution from these strengthening defects. Moreover, the present medium Mn steel demonstrates a good uniform elongation of 15%, which is ascribed to enhanced work hardening behavior due to the operation of both TRIP effect and twinning-induced plasticity (TWIP) effect.
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