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Metastable austenite driven work-hardening behaviour in a TRIP-assisted dual phase steel

Ennis, BL; Jimenez-Melero, E; Atzema, EH; Krugla, M; Azeem, MA; Rowley, D; Daisenberger, D; ... Lee, PD; + view all (2017) Metastable austenite driven work-hardening behaviour in a TRIP-assisted dual phase steel. International Journal of Plasticity , 88 pp. 126-139. 10.1016/j.ijplas.2016.10.005. Green open access

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Abstract

The mechanically-induced transformation behaviour of the metastable austenite phase in a high-strength industrial TRIP-assisted Dual Phase steel was monitored in situ using high-energy synchrotron diffraction under uniaxial loading. This allowed direct quantification of the impact of the transformation of the metastable austenite phase (16 vol %), embedded in a ferrite-bainite-martensite matrix, on the work hardening behaviour of this steel. Our results show that the mechanically induced transformation of austenite does not begin until the onset of matrix yielding. We provide experimental evidence which demonstrates for the first time that the austenite transformation increases the work-hardening contribution, σw thereby supporting a driving force approach to transformation induced plasticity. The transformation work required leads to an increase in the macroscopic work-hardening rate after matrix yielding and continues to offset the decrease in the work-hardening rate in the ferrite and martensite phases up to the UTS. Further we show conclusively that martensite yielding does not occur until the completion of the mechanically induced transformation of austenite. Plastic deformation of martensite is immediately followed by local plastic instability leading to necking and ultimate failure of this material.

Type: Article
Title: Metastable austenite driven work-hardening behaviour in a TRIP-assisted dual phase steel
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ijplas.2016.10.005
Publisher version: https://doi.org/10.1016/j.ijplas.2016.10.005
Language: English
Additional information: © 2016 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4. 0/).
Keywords: Science & Technology, Technology, Engineering, Mechanical, Materials Science, Multidisciplinary, Mechanics, Engineering, Materials Science, Phase Transformation, Crystal Plasticity, Metallic Materials, Mechanical Testing, Synchrotron X-Ray Diffraction, Induced Martensitic-Transformation, X-Ray-Diffraction, Retained Austenite, Deformation-Behavior, Neutron-Diffraction, Induced Plasticity, Stability, Model, Microstructure, Dislocations
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10053206
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