Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 10-11, Pages 2759-2763Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.01.033
Keywords
TWIP steel; XRD; Dislocation density; Mechanical twin
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Funding
- New Energy and Industrial Technology Development Organization (NEDO) of Japan [07A26002a]
- Kagawa University
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In this study, the rate of dislocation accumulation in the tensile strained twinning induced plasticity (TWIP) steel was calculated via the X-ray diffraction (XRD) measurements and compared with other fcc metals and alloys. The results indicated that the XRD technique is an alternative method to estimate the dislocation density. Moreover, flow stress analysis of Fe-31Mn-3Al-3Si TWIP steel with the grain size of about 18 mu m indicated that, beside a direct effect of the dislocation interactions on the flow stress, another strengthening mechanism is also required to describe the flow behavior. For this reason, the strengthening contribution due to the formation of mechanical twins was considered as a reduction of dislocation mean free path. Interestingly, the estimated flow stress equation consisting of the strengthening effects of both dislocation interactions and dynamic microstructure refinement due to mechanical twinning (i.e., the dynamic Hall-Petch effect) are in good agreement with the experimental data and equation proposed by Ludwigson for low SFE materials. (C) 2010 Elsevier B.V. All rights reserved.
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