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On the utility of crystal plasticity modeling to uncover the individual roles of micro-deformation mechanisms on the work hardening response of Fe-23Mn-0.5C TWIP steel in the presence of hydrogen

[+] Author and Article Information
Burak Bal

Department of Mechanical Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan; Department of Mechanical Engineering, Abdullah Gül University, 38080 Kayseri, Turkey
burak.bal@agu.edu.tr

Motomichi Koyama

Department of Mechanical Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
koyama@mech.kyushu-u.ac.jp

Demircan Canadinc

Koc University, Advanced Materials Group (AMG), Department of Mechanical Engineering, Sariyer 34450 Istanbul, Turkey; Koç University, Surface Science and Technology Center (KUYTAM), Sariyer, 34450 Istanbul, Turkey
dcanadinc@ku.edu.tr

Gregory Gerstein

Leibniz Universität Hannover, Institut für Werkstoffkunde (Materials Science), An der Universität 2, 30823 Garbsen, Germany
gerstein@iw.uni-hannover.de

Hans Maier

Leibniz Universität Hannover, Institut für Werkstoffkunde (Materials Science), An der Universität 2, 30823 Garbsen, Germany
maier@iw.uni-hannover.de

Kaneaki Tsuzaki

Department of Mechanical Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
tsuzaki.kaneaki.802@m.kyushu-u.ac.jp

1Corresponding author.

ASME doi:10.1115/1.4038801 History: Received June 01, 2017; Revised December 11, 2017

Abstract

This paper presents a combined experimental and theoretical analysis focusing on the individual roles of micro-deformation mechanisms that are simultaneously active during the deformation of twinning-induced plasticity (TWIP) steels in the presence of hydrogen. Deformation responses of hydrogen-free and hydrogen-charged TWIP steels were examined with the aid of thorough electron microscopy. Specifically, hydrogen charging promoted twinning over slip-twin interactions and reduced ductility. Based on the experimental findings, a mechanism-based micro-scale fracture model was proposed, and incorporated into a visco-plastic self-consistent (VPSC) model to account for the stress-strain response in the presence of hydrogen. In addition, slip-twin and slip - grain boundary interactions in TWIP steels were also incorporated into VPSC, in order to capture the deformation response of the material in the presence of hydrogen. The simulation results not only verify the success of the proposed hydrogen embrittlement (HE) mechanism for TWIP steels, but also open a venue for the utility of these superior materials in the presence of hydrogen.

Copyright (c) 2017 by ASME
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