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5927945 
Journal Article 
Microstructure evolution during thermomechanical processing in 3Mn-0.1C medium-Mn steel 
Hou, F; Bai, Yu; Shibata, A; Tsuji, N 
2019 
1 
Materials Science and Technology
ISSN: 0267-0836
EISSN: 1743-2847 
35 
17 
2101-2108 
WOS:000490404900008 
Medium-Mn steels are energetically investigated as a candidate of the third generation advanced high strength steels (AHSSs). However, their phase transformation and microstructaure evolution during various heat treatments and thermomechanical processing are still unclear. The present study first confirmed the kinetics of static phase transformation behaviour in a 3Mn-0.1C medium-Mn steel. Hot compression tests were also carried out to investigate the influence of high-temperature deformation of austenite on subsequent microstructure evolution. It was found that static ferrite transformation was quite slow in this steel, but ferrite transformation was greatly accelerated by the hot deformation in austenite and ferrite two-phase regions. Characteristic dual-phase microstructures composed of martensite and fine-grained ferrite were obtained, which exhibited superior mechanical properties. This paper is part of a Thematic Issue on Medium Manganese Steels. 
AHSS; medium-Mn steel; hot-compression; ferrite transformation; microstructure evolution; dual-phase; EBSD; mechanical property