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Prediction and evaluation of optimum quenching temperature and microstructure in a 1300 MPa ultra-high-strength Q&P steel

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Abstract

The quenching and partitioning steel is the representative of the third generation of advanced high-strength steel. The effect of quenching temperature on the microstructure and mechanical property of ferrite-containing quenching and partitioning steel was studied by intercritical annealing quenching and partitioning processes. When preparing a test steel with a tensile strength of 1300 MPa and total elongation of 19%, it is found that the actual optimum quenching temperature was lower than that calculated according to the constrained carbon equilibrium. The results indicate that the martensite start temperature of the austenite was overestimated when considering the diffusion of carbon only. Austenite grain size which is affected by low temperature and the existence of ferrite during intercritical annealing influenced the optimum quenching temperature. A scheme considering the diffusion of various alloying elements and austenite grain size was proposed and verified. Using this scheme, the optimum quenching temperature of intercritically annealed quenching and partitioning steel with complex microstructures was well predicted.

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Acknowledgements

The authors gratefully acknowledge the support of the National Key Research and Development Program of Thirteenth Five-Year Plan Period (Grant No. 2017YFB0304400) and Production and Application Demonstration Platform of New Energy Automotive Material (Grant No. TC180A6MR-1).

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Authors and Affiliations

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

    Peng-fei Gao, Ju-hua Liang, Wei-jian Chen, Feng Li & Zheng-zhi Zhao

  2. Beijing Laboratory of Metallic Materials and Processing for Modern Transportation, Beijing, 100083, China

    Peng-fei Gao, Ju-hua Liang, Wei-jian Chen, Feng Li & Zheng-zhi Zhao

  3. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, Anhui, China

    Ju-hua Liang

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  1. Peng-fei Gao
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  2. Ju-hua Liang
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  4. Feng Li
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  5. Zheng-zhi Zhao
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Correspondence to Zheng-zhi Zhao.

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Gao, Pf., Liang, Jh., Chen, Wj. et al. Prediction and evaluation of optimum quenching temperature and microstructure in a 1300 MPa ultra-high-strength Q&P steel. J. Iron Steel Res. Int. 29, 307–315 (2022). https://doi.org/10.1007/s42243-020-00535-5

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  • DOI: https://doi.org/10.1007/s42243-020-00535-5

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