期刊
STEEL RESEARCH INTERNATIONAL
卷 93, 期 5, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/srin.202100534
关键词
intercritical annealing; medium-manganese steel; transformation-induced plasticity; twinning-induced plasticity
资金
- Sichuan Science and Technology Program of China [2019YFH0048, 2020YFH0102]
The microstructures and mechanical properties of hot-rolled Fe-0.35C-3.2Al-5Mn medium-manganese steels were systematically investigated, showing that ultrafine-grained duplex phases with bimodal morphologies can be obtained through intercritical annealing, resulting in high ultimate tensile strength and total elongation. The newly developed medium-manganese steels demonstrate great practical applications due to their excellent combination of mechanical properties.
The microstructures and mechanical properties of Fe-0.35C-3.2Al-5Mn (in wt%, same later) hot-rolled medium-manganese steels are systematically investigated. The results show that ultrafine-grained duplex phases with bimodal morphologies of lath and equiaxed are obtained with intercritical annealing at 750 degrees C for 1 h, along with ultimate tensile strength of 950 MPa and total elongation of 71.2%, attributed to the dislocation slip and deformation of ferrite matrix, accompanied by the synergetic twinning of retained austenite plus transformation of retained austenite to martensite. The newly developed medium-manganese steels, which exhibit an excellent product of ultimate tensile strength and total elongation of 67.6 GPa center dot%, demonstrate great practical applications.
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