|
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
|
