期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.03.008
关键词
TWIP steel; Dynamic strain aging; Portevin-Le Chatelier effect; Delayed fracture
类别
资金
- POSCO [20148053]
- Global Ph.D. Fellowship - National Research Foundation of Korea, South Korea [2013H1A2A1032565]
- National Research Foundation of Korea [2013H1A2A1032565] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The dynamic strain aging (DSA) of metallic materials due to solute atom diffusion to mobile dislocations induce deformation instability with load fluctuations and deformation localizations, hence reducing their sheet formability. In this paper, DSA behaviors of twinning induced plasticity (TWIP) steel with and without Al during tensile testing and deep drawing are investigated in terms of strain localization and the Portevin-Le Chatelier (PLC) band. A theoretical DSA model with internal variables of dislocation density and twin volume fraction is presented for an estimation of strain localization and strain hardening behavior of TWIP steels. The simulation results of the load history and PLC bands during tensile testing and deep drawing are in good agreement with the experimental values. A serration behavior is observed in high-Mn TWIP steels and its tensile residual stress is higher than that in the Al-added TWIP steels, which results in a deformation crack or delayed fracture of deep drawn specimens. (C) 2015 Elsevier B.V. All rights reserved.
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