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Effect of Heat-Treatment Schedule on the Microstructure and Mechanical Properties of Cold-Rolled Dual-Phase Steels

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Low-carbon (0.08 wt% C) steel has been subjected to three different heat treatments to obtain dual-phase steels with different microstructures. An understanding of structure–property was established through tensile tests, in conjunction with scanning electron microscope and transmission electron microscope. The results show that the steel after intermediate quenching (IQ) consisting of fine and fibrous martensite exhibited the intermediate strength, highest elongation and the best comprehensive performance of mechanical properties, whereas the steel subjected to intercritical annealing (IA) produced a network martensite along ferrite grain boundaries, having the lowest strength and intermediate elongation. Besides, step quenching (SQ) resulted in a coarse and blocky ferrite–martensite microstructure showing the worst mechanical properties of the three different heat-treatment conditions. The strain-hardening behavior was studied through the modified Crussard–Jaoul model, indicating two stages of strain-hardening behavior for all three samples. The highest magnitude of strain-hardening ability was obtained by IQ annealing routes. The analysis of the fractured surface revealed that ferrite/martensite interfaces are the most susceptible for microvoid nucleation. However, martensite microcracks were also observed in SQ sample, and the microvoids are nucleated within the ferrite grain in IA sample as well. The variations in strength, elongation, strain-hardening behavior and fracture mechanism of the steel with different heat-treatment schedules were further discussed in relation to the microstructural features.

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Acknowledgments

This work was financially supported by the National Key Project of Scientific and Technical Supporting Programs of China (No. 2011CB606306-2) and the National Natural Science Foundation of China (Grant No. 51204048).

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Authors and Affiliations

  1. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Yong-Gang Deng, Hong-Shuang Di & Jie-Cen Zhang

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  1. Yong-Gang Deng
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  2. Hong-Shuang Di
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  3. Jie-Cen Zhang
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Correspondence to Hong-Shuang Di.

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Deng, YG., Di, HS. & Zhang, JC. Effect of Heat-Treatment Schedule on the Microstructure and Mechanical Properties of Cold-Rolled Dual-Phase Steels. Acta Metall. Sin. (Engl. Lett.) 28, 1141–1148 (2015). https://doi.org/10.1007/s40195-015-0305-x

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  • DOI: https://doi.org/10.1007/s40195-015-0305-x

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