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Vol.48, No.5, 377 ~ 387, 2010
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| Title |
| Fracture Mechanisms of Cold-Rolled Light-Weight Steel Plates Containing Different Carbon Content |
| 한승엽 Seung Youb Han , 신상용 Sang Yong Shin , 이성학 Sung Hak Lee , 김낙준 Nack J. Kim , 곽재현 Jai Hyun Kwak , 진광근 Kwang Geun Chin |
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| Abstract |
| An investigation was conducted into the effects of κ-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 κ-carbides that were severely elongated along the rolling direction were well developed, whereas continuous arrays of κ-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 κ-carbides or κ-carbides formed interfaces between the band structures, which initiated cleavage fractures in the ferrite bands, while the bands populated with a number of κ-carbides did not play an important role in propagating the cracks. Thus, the minimization of interfacial κ-carbides or κ-carbide arrays by increasing the carbon content was essential for preventing cracking from occurring during cold rolling. |
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| Key Words |
| metals, rolling, fracture, scanning electron microscopy, SEM, κ-carbide |
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