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Stretch-flangeability of twinning-induced plasticity steel-cored three-layer steel sheet

Title
Stretch-flangeability of twinning-induced plasticity steel-cored three-layer steel sheet
Authors
Jung Gi KimJae Ik YoonSeung Mi BaekMing Hong SeoKwang-Geun ChinSunghak LeeHyoung Seop Kim
POSTECH Authors
Sunghak LeeHyoung Seop Kim
Date Issued
Aug-2018
Publisher
ELSEVIER SCIENCE SA
Abstract
In this study, the stretch-flangeability of twinning-induced plasticity (TWIP)-cored three-layer steel (TWCLS) sheet was evaluated, Although the mechanical properties of TWCLS sheet follow the force-based rule-of-mixtures (ROM), the experimental hole expansion ratio (HER) is less than the predicted HER values. The poor HER in TWCLS sheet originates from crack initiation at the fracture zone of the TWIP steel-core. The fracture initiation energy vs. HER in TWCLS sheet reveals that the layered material follows the behavior of the monolithic material when the sound interface is conserved. If the initial defects are removed by a reaming process in the hole, the HER of TWCLS sheet follows the force-based ROM. This result shows that the stretch-flangeability of the layered material can be controlled by managing the volume fraction of parent materials when the sources of extrinsic damage (i.e, interface delamination and defects) are removed.
URI
http://oasis.postech.ac.kr/handle/2014.oak/92300
DOI
10.1016/j.jmatprotec.2018.04.002
ISSN
0924-0136
Article Type
Article
Citation
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, vol. 258, page. 220 - 225, 2018-08
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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