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Open AccessArticle

Deformation Behavior of a Double Soaked Medium Manganese Steel with Varied Martensite Strength

1
Advanced Steel Processing and Products Research Center, Colorado School of Mines, Golden, CO 80401, USA
2
Los Alamos National Laboratory, Los Alamos, NM 87545, USA
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(7), 761; https://doi.org/10.3390/met9070761
Received: 15 June 2019 / Revised: 29 June 2019 / Accepted: 4 July 2019 / Published: 7 July 2019
(This article belongs to the Special Issue Physical Metallurgy of High Manganese Steels)
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Abstract

The effects of athermal martensite on yielding behavior and strain partitioning during deformation is explored using in situ neutron diffraction for a 0.14C–7.14Mn medium manganese steel. Utilizing a novel heat treatment, termed double soaking, samples with similar microstructural composition and varied athermal martensite strength and microstructural characteristics, which composed the bulk of the matrix phase, were characterized. It was found that the addition of either as-quenched or tempered athermal martensite led to an improvement in mechanical properties as compared to a ferrite plus austenite medium manganese steel, although the yielding and work hardening behavior were highly dependent upon the martensite characteristics. Specifically, athermal martensite was found to promote continuous yielding and improve the work hardening rate during deformation. The results of this study are particularly relevant when considering the effect of post-processing thermal heat treatments, such as tempering or elevated temperature service environments, on the mechanical properties of medium manganese steels containing athermal martensite. View Full-Text
Keywords: neutron diffraction; austenite stability; medium manganese steel; double soaking; localized deformation neutron diffraction; austenite stability; medium manganese steel; double soaking; localized deformation
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Glover, A.; Gibbs, P.J.; Liu, C.; Brown, D.W.; Clausen, B.; Speer, J.G.; De Moor, E. Deformation Behavior of a Double Soaked Medium Manganese Steel with Varied Martensite Strength. Metals 2019, 9, 761.

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