Thermomechanical response of a TWIP steel during monotonic and non-monotonic uniaxial loading
- Authors
- Majidi, Omid; De Cooman, B. C.; Barlat, Frederic; Lee, Myoung-Gyu; Korkolis, Yannis P.
- Issue Date
- 30-9월-2016
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Elongation; Relaxation; Loading-unloading-reloading; Dynamic strain aging; Thermography
- Citation
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v.674, pp.276 - 285
- Indexed
- SCIE
SCOPUS
- Journal Title
- MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
- Volume
- 674
- Start Page
- 276
- End Page
- 285
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/87476
- DOI
- 10.1016/j.msea.2016.08.002
- ISSN
- 0921-5093
- Abstract
- The tensile properties of a Fe-18%Mn-0.6%C-1.5%Al Twinning-Induced Plasticity (TWIP) steel were investigated at different strain rates in three loading modes, i.e. uniaxial monotonic loading, stress relaxation and loading-unloading-reloading. Infrared thermography was used to investigate the effect of the dynamic strain aging, the strain rate and the temperature on the flow stress. In addition to the standard, i.e., non-isothermal tensile tests, isothermal uniaxial tensile tests were performed at 25 degrees C, 45 degrees C and 65 degrees C. While the non-monotonic loading modes resulted in an increase of the total elongation at a low strain rate of 10(-3) s(-1), no increase was observed for strain rates higher than 6 x 10(-3) s(-1). The temperature gradients observed during non-isothermal tests were reduced when non-monotonic loading conditions were used. Temperature changes were found to influence the hardening behavior, and consequently the ductility, of the TWIP steel. Deformation twinning also had a significant influence on the results as its kinetics in TWIP steel are determined by the temperature dependence of the stacking fault energy. (C) 2016 Elsevier B.V. All rights reserved.
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