탄소함량이 다른 경량철강판의 냉간 압연에 의한 파괴기구

• Published in: 대한금속·재료학회지, 48(5) pp. 377 - 386
• Main Authors: 한승엽, 신상용, 이성학, 김낙준, 곽재현, 진광근
• Format: Journal Article
• Language: Korean
• Published: 대한금속·재료학회 01.05.2010
• Subjects: 재료공학
• ISSN: 1738-8228; 2288-8241

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. KCI Citation Count: 9