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Erschienen in: Journal of Materials Science 8/2019

07.01.2019 | Metals

High strength and ductility combination in nano-/ultrafine-grained medium-Mn steel by tuning the stability of reverted austenite involving intercritical annealing

verfasst von: Jun Hu, Jia-Mei Zhang, Guo-Sheng Sun, Lin-Xiu Du, Yue Liu, Ying Dong, R. D. K. Misra

Erschienen in: Journal of Materials Science | Ausgabe 8/2019

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Abstract

The structure–property relationship in 0.06C–5.5Mn steel subjected to different annealing temperatures and time was studied. Mn played a stronger effect on stabilizing austenite in comparison with Ni, and low-C medium-Mn steel possessed excellent hardenability. The reverse transformation of martensite to austenite occurred during intercritical annealing, and the volume fraction was first increased and then decreased on increasing annealing temperature or prolonging annealing time, indicative of change in thermal stability by element partitioning and coarsening of grain size. Correspondingly, the elongation was first increased and then decreased, consistent with the variation in the stability of reverted austenite. The yield strength was gradually decreased because of several factors, including recrystallization of α′ martensite, decreased stability of reverted austenite, and coarse grain size. The maximum product of strength and ductility was obtained on annealing at 650 °C for 10 min, which was attributed to the optimal stability of reverted austenite rather than the highest volume fraction, and tensile strength and elongation were 1120 MPa and 23.3%. The strain partitioning behavior of two phases was elucidated by analyzing Lüders straining and continuous work hardening after yield point elongation, and the deformation mechanism was strongly related to the stability of reverted austenite.

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Metadaten
Titel
High strength and ductility combination in nano-/ultrafine-grained medium-Mn steel by tuning the stability of reverted austenite involving intercritical annealing
verfasst von
Jun Hu
Jia-Mei Zhang
Guo-Sheng Sun
Lin-Xiu Du
Yue Liu
Ying Dong
R. D. K. Misra
Publikationsdatum
07.01.2019
Verlag
Springer US
Erschienen in
Journal of Materials Science / Ausgabe 8/2019
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-018-03291-w

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