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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
79 - 84 (6page)

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Microstructure and tensile properties of ferritic Fe-8Al-5Mn-0.1Nb lightweight steels with different C contents(0.005, 0.02, and 0.05 wt%) have been investigated in the present study. It shows that the microstructurebecomes more elongated along the rolling direction, i.e., increasing propensity towards unrecrystallizationwith an increase in C content. This is mainly due to the effect of NbC on retarding the dynamic recrystallizationof ferrite during hot rolling, which is active for higher C (0.02C and 0.05C) containing alloys. Inthe case of the 0.05C alloy, there is an additional precipitation of κ-carbide particles, which also retard thedynamic recrystallization of ferrite during hot rolling, resulting in a much more elongated structure in the 0.05Ccontaining alloy than in the 0.02C alloy in as-hot rolled condition. Although κ-carbide particles retard thedynamic recrystallization of ferrite during hot rolling, they play an opposite role during final annealing,i.e., promoting static recrystallization by the operation of particle-stimulated nucleation mechanism, resulting inthe development of homogeneously distributed fine grains in the 0.05C alloy. As a result, the 0.05C alloy showshigher strength and larger elongation than the lower C containing alloys.

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