Effect of C content on the microstructure and tensile properties of lightweight ferritic Fe-8Al-5Mn-0.1Nb alloy
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- Title
- Effect of C content on the microstructure and tensile properties of lightweight ferritic Fe-8Al-5Mn-0.1Nb alloy
- Authors
- Zargaran, A; Kim, HS; Kwak, JH; Kim, NJ
- Date Issued
- 2015-01
- Publisher
- Korean Institute of Metals and Materials
- Abstract
- Microstructure and tensile properties of ferritic Fe-8Al-5Mn-0.1 Nb 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 microstructure becomes more elongated along the rolling direction, i.e., increasing propensity towards unrecrystallization with an increase in C content. This is mainly due to the effect of NbC on retarding the dynamic recrystallization of ferrite during hot rolling, which is active for higher C (0.02C and 0.05C) containing alloys. In the case of the 0.05C alloy, there is an additional precipitation of kappa-carbide particles, which also retard the dynamic recrystallization of ferrite during hot rolling, resulting in a much more elongated structure in the 0.05C containing alloy than in the 0.02C alloy in as-hot rolled condition. Although kappa-carbide particles retard the dynamic 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 in the development of homogeneously distributed fine grains in the 0.05C alloy. As a result, the 0.05C alloy shows higher strength and larger elongation than the lower C containing alloys.
- Keywords
- lightweight steels; ferrite; NbC; recrystallization; grain refinement; MECHANICAL-PROPERTIES; DEFORMATION-BEHAVIOR; IRON-ALUMINUM; AL-ALLOYS; STEELS; CARBON; MN; PRECIPITATION; NB
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/13603
- DOI
- 10.1007/S12540-015-1009-5
- ISSN
- 1598-9623
- Article Type
- Article
- Citation
- METALS AND MATERIALS INTERNATIONAL, vol. 21, no. 1, page. 79 - 84, 2015-01
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