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Effect of Intercritical Annealing Time on the Microstructures and Tensile Properties of a High Strength TRIP Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

A new Mn–Si–Al–Mo–Nb transformation-induced plasticity steel was annealed by intercritical annealing for different durations to investigate the partitioning of C element and the volume fraction change of the microstructural constituents. Direct experimental evidence confirms the partitioning of C elements in different phases during heat treatment by Electron probe microanalysis and X ray diffraction. The distribution of the precipitates was investigated as well. It was revealed that the microstructures and mechanical properties of the investigated steels were affected by the intercritical annealing time. According to the present experiment, the volume fraction of retained austenite and the product of tensile strength and total elongation of investigated steel decrease with increasing intercritical annealing time. It was observed that high tensile strength of 1,103 MPa, total elongation of 21.3%, and strength-ductility product of 23,493.9 MPa % could be successfully produced in this experimental steel at intercritical annealing temperature of 830 °C, holding for 1 min, and isothermal bainite treatment of 440 °C for 5 min holding time.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51031001).

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Authors and Affiliations

  1. School of Materials and Metallurgy, Northeastern University, Shenyang, 110819, China

    Chao Wang, Hua Ding & Jun Zhang

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

    Hua Ding & Hongyan Wu

Authors
  1. Chao Wang
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  2. Hua Ding
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  3. Jun Zhang
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  4. Hongyan Wu
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Correspondence to Hua Ding.

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Wang, C., Ding, H., Zhang, J. et al. Effect of Intercritical Annealing Time on the Microstructures and Tensile Properties of a High Strength TRIP Steel. Acta Metall. Sin. (Engl. Lett.) 27, 457–463 (2014). https://doi.org/10.1007/s40195-014-0061-3

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  • DOI: https://doi.org/10.1007/s40195-014-0061-3

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