| Title |
Fracture Mechanisms of Cold-Rolled Light-Weight Steel Plates Containing Different Carbon Content |
| Authors |
한승엽(Seung Youb Han); 신상용(Sang Yong Shin); 이성학(Sung Hak Lee); 김낙준(Nack J. Kim); 곽재현(Jai Hyun Kwak); 진광근(Kwang Geun Chin) |
| DOI |
https://doi.org/10.3365/KJMM.2010.48.05.377 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
metals; rolling; fracture; scanning electron microscopy; SEM; κ-carbide |
| 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 containeda 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. |