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The significance of microstructural evolution on governing impact toughness of Fe-0.2C-6Mn-3Al medium-Mn TRIP steel studied by a novel heat treatment

  • Zhichao Li , Xinjing Li , Yanjie Mou , Zhihui Cai EMAIL logo , Devesh Misra , Xin Zhang and Huiping Li

Abstract

We address here the continuing challenge and scientific gap in obtaining high impact toughness in medium-Mn steels. While addressing the challenge, the objective of the study described here is to obtain a fundamental understanding via critical experimental analysis of the reasons underlying high impact toughness that was successfully obtained in Fe-0.2C-6Mn-3Al medium-Mn TRIP steel. Electron microscopy and X-ray diffraction studies clearly underscored the absence of the TRIP effect in Fe-0.2C-6Mn-3Al medium manganese steel during impact and the volume fraction of austenite played a determining role in governing impact toughness. The highest impact toughness of 213.6 J · cm2 was obtained when the steel was subjected to an intercritical hardening temperature of 700 °C and low tempering temperature of 200 °C. The presence of martensite in the microstructure reduced the impact toughness on quenching from 750 – 850 °C.


Prof Zhihui Cai Taiyuan University of Science and Technology School of Mechanical Engineering Hailiu Road 66 030024 Taiyuan P. R. China Tel.: +86 13012511021

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Received: 2020-05-04
Accepted: 2021-01-04
Published Online: 2021-04-20
Published in Print: 2021-04-30

© 2021 Walter de Gruyter GmbH, Berlin/Boston, Germany

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