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Fracture Mechanisms of Cold-Rolled Light-Weight Steel Plates Containing Different Carbon Content

Title
Fracture Mechanisms of Cold-Rolled Light-Weight Steel Plates Containing Different Carbon Content
Authors
Han, SYShin, SYLee, SKim, NJKwak, JHChin, KG
POSTECH Authors
Lee, SKim, NJ
Date Issued
May-2010
Publisher
KOREAN INST METALS MATERIALS
Abstract
An investigation was conducted into the effects of kappa-carbides on the cracking phenomenon, which often occurred in cold-rolled light-weight steel plates. Three kinds of steels were fabricated by varying the C content, and their microstructures and tensile properties were investigated. In the two steels that contained a high carbon content, the band structures of ferrites and kappa-carbides that were severely elongated along the rolling direction were well developed, whereas continuous arrays of kappa-carbides were formed in the steel that contained a low carbon content. Detailed microstructural analyses of the deformed region beneath the tensile fracture surface showed that the cracks initiated at arrays of kappa-carbides or kappa-carbides formed interfaces between the band structures, which initiated cleavage fractures in the ferrite bands, while the bands populated with a number of kappa-carbides did not play an important role in propagating the cracks. Thus, the minimization of interfacial kappa-carbides or kappa-carbide arrays by increasing the carbon content was essential for preventing cracking from occurring during cold rolling.
Keywords
metals; rolling; fracture; scanning electron microscopy (SEM); kappa-carbide; TRIP/TWIP STEELS; TRANSFORMATION; DEFORMATION; MICROSTRUCTURE; DUCTILE; SYSTEM
URI
http://oasis.postech.ac.kr/handle/2014.oak/25451
DOI
10.3365/KJMM.2010.48.05.377
ISSN
1738-8228
Article Type
Article
Citation
KOREAN JOURNAL OF METALS AND MATERIALS, vol. 48, no. 5, page. 377 - 386, 2010-05
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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