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Open AccessArticle

Processing Variants in Medium-Mn Steels

1
Advanced Steel Processing and Products Research Center, Colorado School of Mines, Golden, CO 80401, USA
2
Tata Steel, Wenckebachstraat 1, 1970 CA IJmuiden, The Netherlands
3
AK Steel, AK Steel Research and Innovation Center, 6180 Research Way, Middletown, OH 45005, USA
*
Author to whom correspondence should be addressed.
Metals 2019, 9(7), 771; https://doi.org/10.3390/met9070771
Received: 10 June 2019 / Revised: 1 July 2019 / Accepted: 4 July 2019 / Published: 10 July 2019
(This article belongs to the Special Issue Physical Metallurgy of High Manganese Steels)
This paper highlights some recent efforts 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 effectively decoupling the quenching and partitioning steps. View Full-Text
Keywords: medium-Mn steel; hot-stamping; double soaking; continuous annealing; quenching and partitioning; high strength steel medium-Mn steel; hot-stamping; double soaking; continuous annealing; quenching and partitioning; high strength steel
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Speer, J.; Rana, R.; Matlock, D.; Glover, A.; Thomas, G.; De Moor, E. Processing Variants in Medium-Mn Steels. Metals 2019, 9, 771.

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