Strain hardening rate sensitivity and strain rate sensitivity in TWIP steels
authors Bintu, A; Vincze, G; Picu, CR; Lopes, AB; Gracio, JJ; Barlat, F
nationality International
journal MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
author keywords TWIP steel; Mechanical behavior; Deformation twinning; Strain rate sensitivity
keywords AUSTENITIC STEEL; DEFORMATION; MECHANISMS; ALLOYS; MODEL; GRAIN
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.
publisher ELSEVIER SCIENCE SA
issn 0921-5093
year published 2015
volume 629
beginning page 54
ending page 59
digital object identifier (doi) 10.1016/j.msea.2015.01.080
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000351795600007
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journal impact factor 3.414
5 year journal impact factor 3.478
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