Abstract
The tensile properties of vanadium-added steels with different ferrite and pearlite hardness ratios were evaluated. In this study, four types of specimens were prepared. The specimen without vanadium (specimen A) was cooled from 1359 K to room temperature (298 K ± 2 K) in a furnace. The specimens containing vanadium (specimens B, C, and D) were cooled from 1359 to 1073, 1023, and 923 K, held for 60 min, and then cooled to room temperature in the furnace. The microstructures of all specimens consisted of ferrite and pearlite, and the volume fraction of each phase in all specimens was nearly the same. Compared to specimen A, the size and morphology of each phase in the vanadium-added steels were finer and more equiaxed, and the hardness of ferrite and pearlite increased. The increase in the ferrite hardness was attributed to the precipitation strengthening due to vanadium carbide, whereas that of pearlite was attributed not only to the precipitation strengthening due to vanadium carbide but also the ferrite/cementite misfit causing lattice strain increment. The ferrite hardness of specimen B was the highest, and that in pearlite of specimen D was the lowest. As a result, the hardness ratios of B and D were lower than those of A and C. Strength–ductility balance was improved by adding vanadium. Moreover, it was further enhanced by improving local elongation due to the decrease in ferrite and pearlite hardness ratio.
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This study was partly supported by JSPS KAKENHI Grant Number 21K14423.
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Kawamura, M., Ogawa, T., Sun, F. et al. Evaluation of the Tensile Properties of Vanadium-Added Steels with Different Ferrite and Pearlite Hardness Ratios. J. of Materi Eng and Perform (2023). https://doi.org/10.1007/s11665-023-08436-w
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DOI: https://doi.org/10.1007/s11665-023-08436-w