Scale dependence of the strain rate sensitivity of Twinning-Induced Plasticity steel
authors Bintu, A; Vincze, GT; Picu, RC; Lopes, AB; Bdikin, I
nationality International
journal MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
author keywords TWIP steel; Strain rate sensitivity; Nano-indentation; Deformation twinning
keywords TWIP STEELS; AUSTENITIC STEEL; DEFORMATION; TENSILE; TEMPERATURE; MECHANISMS; EVOLUTION
abstract We report that the mechanical behavior of Twinning-Induced Plasticity steel deformed at different strain rates depends on the scale of observation. Slower-deformed samples have a higher twin density, which leads to larger flow stress measured in a macroscopic uniaxial test. When probed at the nanoscale by nano-indentation, samples pre-deformed at smaller strain rates exhibit systematically smaller hardness than samples pre-deformed at higher rates. The hardness-based nanoscale strain rate sensitivity is positive. The strain rate sensitivity measured by micro-hardness shifts to negative values as the indenter size and the probed volume increase. The effect is linked to the dislocation-twin interaction mechanism. (C) 2016 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0921-5093
year published 2016
volume 674
beginning page 98
ending page 103
digital object identifier (doi) 10.1016/j.msea.2016.07.127
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:000383292800013
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journal impact factor 3.414
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