Journal
METALS
Volume 9, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/met9070771
Keywords
medium-Mn steel; hot-stamping; double soaking; continuous annealing; quenching and partitioning; high strength steel
Funding
- Advanced Steel Processing and Products Research Center (ASPPRC) at the Colorado School of Mines
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This paper highlights some recent e ff orts to extend the use of medium-Mn steels for applications other than intercritically batch-annealed steels with exceptional ductility ( and strengths in the range of about 1000 MPa). These steels are shown to enable a range of promising properties. In hot-stamping application concepts, elevated Mn concentration helps to stabilize austenite and to provide a range of attractive property combinations, and also reduces the processing temperatures and likely eliminates the need for press quenching. The double soaking concept also provides a wide range of attractive mechanical property combinations that may be applicable in cold-forming applications, and could be implemented in continuous annealing and / or continuous galvanizing processes where Zn-coating would typically represent an additional austempering step. Quenching and partitioning of steels with elevated Mn concentrations have exhibited very high strengths, with attractive tensile ductility; and medium-Mn steels have been successfully designed for quenching and partitioning using room temperature as the quench temperature, thereby e ff ectively decoupling the quenching and partitioning steps.
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