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Correlation between fracture toughness and stretch-flangeability of advanced high strength steels

Title
Correlation between fracture toughness and stretch-flangeability of advanced high strength steels
Authors
Jae Ik YoonJamyun JungSoo-Hyun JooTae Jin SongKwang-Geun ChinMin Hong SeoKIM, SUNG JOONLee, SKim, HS
POSTECH Authors
KIM, SUNG JOONLee, SKim, HS
Date Issued
Oct-2016
Publisher
ELSEVIER SCIENCE BV
Abstract
Stretch-flangeability representing the capability of a sheet material to form into a complex shaped part is not a well-known sheet metal forming property. We correlate mechanical properties with stretch-flangeability of various advanced high strength steels (AHSSs) to capture the stretch-flanging phenomenon and improve the stretch-flangeability of steel sheet materials. The stretch-flangeability of materials is usually evaluated using a hole expansion test. During the hole expansion test, the stress state in the hole edge part of the specimen is almost the same as that of the uniaxial tensile test. However, a single parameter in tensile properties of the AHSSs exhibits no clear correlation with flangeability estimated as the hole expansion ratio (HER). Because micro-cracks in the hole edge region of the hole expansion testing samples play a significant role in HER values, we propose and demonstrate that fracture toughness is the key factor governing the HER of AHSSs. (C) 2016 Elsevier B.V. All rights reserved.
Keywords
Hole expansion ratio; Advanced high strength steels; Tensile properties; Metal forming and shaping; Metals and alloys; Deformation and fracture
URI
http://oasis.postech.ac.kr/handle/2014.oak/37164
DOI
10.1016/J.MATLET.2016.05.145
ISSN
0167-577X
Article Type
Article
Citation
Materials Letters, vol. 180, page. 322 - 326, 2016-10
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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