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Stability of Retained Austenite Through a Combined Intercritical Annealing and Quenching and Partitioning (IAQP) Treatment

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

Intercritical annealing (IA) at various temperatures followed by quenching and partitioning (IAQP) treatments was conducted on a cold-rolled Fe–0.2C–1.42Si–1.87Mn (wt%) sheet steel. Optimized microstructure and enhanced mechanical properties were achieved through appropriate adjustment of IA temperatures. The steel which was annealed at 1,033 K for 600 s, then quenched to 573 K and partitioned at 693 K for 20 min, designated as 1033QP steel, exhibits maximum 16.3 vol% retained austenite (RA) with good mechanical properties (ultimate tensile strength 886 MPa and total elongation 27%). It was found that the thermal and mechanical stabilities of RA are mainly influenced by the combined effect of its average carbon content and amount of adjacent martensite. Furthermore, the transformation-induced plasticity effect increased the peak n-values observed at the second stage of the work hardening of IAQP steels.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (No. 51174251) and the National Basic Research Program of China (No. 2010CB630803). The authors would like to acknowledge Professor David Embury, University of McMaster, Ontario, Canada, for helpful discussion. The authors acknowledge Professor Shipu Chen, Shanghai Jiao Tong University, Shanghai, China, for helpful discussion.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Rd, Shanghai, 200240, China

    Ri-Ming Wu, Wei Li, Cheng-Lin Wang, Yi Xiao & Xue-Jun Jin

  2. School of Materials Science and Engineering, Shanghai University, 149 Yanchang Rd, Shanghai, China

    Ri-Ming Wu

  3. State Key Lab of Development and Application Technology of Automotive Steels, Baosteel Research Institute, Shanghai, 201900, China

    Li Wang

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  1. Ri-Ming Wu
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  2. Wei Li
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  3. Cheng-Lin Wang
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  4. Yi Xiao
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  5. Li Wang
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Correspondence to Xue-Jun Jin.

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Wu, RM., Li, W., Wang, CL. et al. Stability of Retained Austenite Through a Combined Intercritical Annealing and Quenching and Partitioning (IAQP) Treatment. Acta Metall. Sin. (Engl. Lett.) 28, 386–393 (2015). https://doi.org/10.1007/s40195-015-0217-9

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  • DOI: https://doi.org/10.1007/s40195-015-0217-9

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