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자료유형
학술저널
저자정보
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.21 No.1
발행연도
2015.1
수록면
43 - 53 (11page)

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초록· 키워드

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An investigation was conducted into the cracking phenomenon occurring during the cold rolling of lightweightsteel plates. Four steels of varying C contents were fabricated and steel plates containing C contents of 0.5wt% orhigher were cracked during the initial stage of the cold rolling. The steels were basically composed of ferritegrains and -carbides in a band shape, but the volume fraction and thickness of κ-carbide band increased asthe C content increased. Microstructural observation of the deformed region of fractured tensile specimens revealedthat deformation bands were homogeneously formed in wide areas of ferrite matrix in the steels containingC contents of 0.3 wt% or lower, while κ-carbide bands were hardly deformed or cracked. In the steels containinghigh C contents of 0.5 wt% or higher, on the other hand, microcracks were initiated mostly at fine proeutectoidferrite located within κ-carbide bands, and were grown further to coalesce with other microcracksto form long cracks. To prevent the cracking, thus, the proeutectoid ferrite should be minimized by the hotrolling in the (α+γ) two phase region. As practical methods, the content of C below 0.5% or Al above 5%was suggested to expand the (α+γ) phase region.

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