Abstract
This study investigates the effect of ferrite/martensite phase size and dispersion of nano-precipitates in ferrite on strength, ductility, and fracture behavior of dual-phase (DP) steels. Dispersion of nano-precipitates in ferrite improves the strength with keeping sufficient uniform elongation and post-uniform elongation, while decrease in ferrite/martensite phase size has a little effect on the increase in strength in the phase size range investigated. However, the refinement of phase size significantly improves the post-uniform elongation and reduction in area. It is concluded therefore that a simultaneous combination of refinement of ferrite/martensite phase size and dispersion of nano-precipitation in ferrite is effective to significantly improve the strength and strength–post-uniform elongation in DP steels. Quantitative analysis of void formation reveals that fracture by martensite cracking is a primary fracture mechanism in coarse phase-sized DP samples, while ferrite/martensite interface decohesion becomes a dominant fracture mechanism in fine phase-sized DP samples. It is suggested that the refinement of phase size is a promising strategy to change the fracture behavior from brittle to ductile manner, leading to an enhancement of local deformability after the necking.
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Acknowledgments
This research was financially supported partly by a project of “Creation of New Principles in the Multi-scale Design of Steels Based on Light Element Strategy” through the Core Research for Evolutional Science and Technology in the Japan Science and Technology Agency (JST-CREST) and partly by a project of “Research on the Relation between Microstructure and Ductile Fracture in Steel” in the Iron and Steel Institute of Japan (ISIJ), which are gratefully appreciated. NK also thanks a financial support from the Grant-in-Aid for Young Scientists (A) (Grant No. 23686103) through the Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan.
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Manuscript submitted January 9, 2019.
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Chandiran, E., Sato, Y., Kamikawa, N. et al. Effect of Ferrite/Martensite Phase Size on Tensile Behavior of Dual-Phase Steels with Nano-Precipitation of Vanadium Carbides. Metall Mater Trans A 50, 4111–4126 (2019). https://doi.org/10.1007/s11661-019-05353-3
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DOI: https://doi.org/10.1007/s11661-019-05353-3