Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/20995
Title: | Strain hardening rate sensitivity and strain rate sensitivity in TWIP steels |
Author: | Bintu, Alexandra Vincze, Gabriela Picu, Catalin R. Lopes, Augusto B. Gracio, Jose J. Barlat, Frederic |
Keywords: | AUSTENITIC STEEL DEFORMATION MECHANISMS ALLOYS MODEL GRAIN |
Issue Date: | 2015 |
Publisher: | ELSEVIER SCIENCE SA |
Abstract: | TWIP steels are materials with very high strength and exceptional strain hardening capability, parameters leading to large energy absorption before failure. However, TWIP steels also exhibit reduced (often negative) strain rate sensitivity (SRS) which limits the post-necking deformation. In this study we demonstrate for an austenitic TWIP steel with 18% Mn a strong dependence of the twinning rate on the strain rate, which results in negative strain hardening rate sensitivity (SHRS). The instantaneous component of SHRS is large and negative, while its transient is close to zero. The SRS is observed to decrease with strain, becoming negative for larger strains. Direct observations of the strain rate dependence of the twinning rate are made using electron microscopy and electron backscatter diffraction, which substantiate the proposed mechanism for the observed negative SHRS. (C) 2015 Elsevier B.V. All rights reserved. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/20995 |
DOI: | 10.1016/j.msea.2015.01.080 |
ISSN: | 0921-5093 |
Publisher Version: | 10.1016/j.msea.2015.01.080 |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Strain hardening rate sensitivity and strain rate sensitivity in TWIP steels_10.1016j.msea.2015.01.080.pdf | 1.42 MB | Adobe PDF |
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