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Evaluation of tensile properties of ferrite single-phase low-carbon steel with different initial microstructures

1 Department of Materials Design Innovation Engineering, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
2 Department of Mechanical Engineering, Materials Science, and Ocean Engineering, Graduate School of Engineering Science, Yokohama National University, 79-1 Tokiwadai, Hodogaya-ku, Yokohama, Kanagawa 240-8501, Japan

Special Issues: Construction Materials

The tensile properties of ferrite single-phase low-carbon steel with different initial microstructures were evaluated. Three types of hot-rolled sheet specimens with different microstructures—specimen P (consisting of ferrite and pearlite), specimen B (consisting of bainitic structures), and specimen M (consisting of fully martensitic structures) were used. After hot rolling, these specimens were cold-rolled, subsequently heated to the finishing temperature of ferrite recrystallization, and then water-quenched to room temperature. The recrystallized ferrite grain size decreased in the specimen order of B > P > M. The distribution of cementite was comparatively homogeneous in specimens B and M, whereas that in specimen P was heterogeneous. The yield and tensile strengths decreased in the specimen order of M > P > B. Calculations using the Hall–Petch equation revealed that the yield strength of each specimen depended mainly on the recrystallized ferrite grain size. The total elongation decreased in the specimen order of B > P > M, whereas the local elongation was approximately the same in all of the specimens. In addition, the number of dimples decreased in the specimen order of M > B > P, whereas the size of dimples decreased in the specimen order of P > B > M. These results suggest that the homogeneous distribution of cementite and the fine recrystallized ferrite grains in specimen M suppress void coalescence, thereby resulting in a good balance between the tensile strength and the local elongation.
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Keywords low-carbon steel; cementite; recrystallization; initial microstructure; tensile property

Citation: Toshio Ogawa, Hiroyuki Dannoshita, Yoshitaka Adachi. Evaluation of tensile properties of ferrite single-phase low-carbon steel with different initial microstructures. AIMS Materials Science, 2019, 6(5): 798-805. doi: 10.3934/matersci.2019.5.798


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