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Effect of Heat Treatment on Microstructure and Mechanical Properties of Quenching and Partitioning Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In order to investigate the effect of microstructural characterization on the mechanical properties and retained austenite stability, a different type of quenching and partitioning steel (I-Q&P) through intercritical annealing before the quenching and partitioning process was designed, which can realize lamellar intercritical microstructure compared to the conventional quenching and partitioning (Q&P) process. The morphology of ferrite and martensite/retained austenite is lamellar in the I-Q&P steel while it is equiaxed after being heat-treated by conventional Q&P process. The I-Q&P steel is proved to have better formability and mechanical properties than conventional Q&P steel, which is due to the higher-volume fraction of retained austenite in the I-Q&P steel and confirmed by electron backscattering diffraction patterns and X-ray diffraction. Furthermore, the stability of retained austenite in I-Q&P steel is also higher than that in conventional Q&P steel, which is investigated by tensile tests and differential scanning calorimetry.

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Authors and Affiliations

  1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China

    Shao-Heng Sun & Ai-Min Zhao

  2. Key Laboratory for Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Ran Ding

  3. New Technology Department, Beijing Electric Vehicle CO., LTD, Beijing, 102606, China

    Xiao-Gang Li

Authors
  1. Shao-Heng Sun
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  2. Ai-Min Zhao
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  3. Ran Ding
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  4. Xiao-Gang Li
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Correspondence to Ai-Min Zhao.

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Available online at http://link.springer.com/journal/40195

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Sun, SH., Zhao, AM., Ding, R. et al. Effect of Heat Treatment on Microstructure and Mechanical Properties of Quenching and Partitioning Steel. Acta Metall. Sin. (Engl. Lett.) 31, 216–224 (2018). https://doi.org/10.1007/s40195-017-0667-3

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  • DOI: https://doi.org/10.1007/s40195-017-0667-3

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