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Effect of Intercritical Annealing Temperature to Mechanical Performance of Hot-Rolled Medium Manganese Steel

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Abstract:

In order to find optimal intercritical annealing treatment (IAT) temperature and alloy composition for simple process route of hot rolling followed by single-step IAT, the effects of IAT on three different medium-manganese steels were investigated. Nominal chemical compositions in wt.% were 1) 6Mn–0.3C, 2) 6Mn–0.4C and 3) 8Mn–0.4C(–2Al–1Si–0.05Nb–Fe). Materials were laboratory hot rolled to a thickness of 6 mm, and IAT was simulated with Gleeble 3800 and Linseis DIL L78 DQT / RITA dilatometer. Different variations of IAT included annealing temperatures of 650 °C, 675 °C, 700 °C and 725 °C, with holding time of 10 minutes, heating rate of 50 °C/s and cooling rate of 10 °C/s. Quasi-static tensile tests were performed parallel to rolling direction. XRD and EBSD phase mappings were performed to assess IAT temperatures effect on volume fraction of retained austenite. Most promising mechanical properties were obtained with material 6Mn–0.4C annealed at 700 °C. Product of strength and elongation well exceeded 40 000 MPa% for above-mentioned IAT-material variation, being distinguishable higher compared to other variations. However, investigated materials, especially 6Mn–0.4C, seems to be very sensitive to IAT temperature, which could inflict some challenges in industrial scale production. Also, all materials experienced some level of serrations during tensile testing, which is frequently encountered phenomena with medium-manganese steels. Further research is required, to evaluate the role of austenite stability on mechanical behavior of these materials and to determine effects of heating and cooling rates.

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Periodical:

Materials Science Forum (Volume 1174)

Pages:

83-88

DOI:

https://doi.org/10.4028/p-kG28cH

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Online since:

January 2026

Authors:

Tuomas Perkiö*, Pekka K. Kantanen, Antti Kaijalainen

Keywords:

Intercritical Annealing, Medium Manganese Steel, Retained Austenite, Tensile Properties

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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