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Prediction model of austenite growth and the role of MnS inclusions in non-quenched and tempered steel

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Abstract

The austenite growth behavior of non-quenched and tempered steels (casted by continuous casting and molding casting processes) was studied. The austenite grain size of steel B casted by continuous casting process is smaller than that of steel A casted by molding casting process at the same heating parameters. The abnormal austenite growth temperature of the steels A and B are 950 °C and 1000 °C, respectively. Based on the results, the models for the austenite grain growth below and above the abnormal austenite growth temperature of the investigated steels were established. The dispersedly distributed fine particles MnS in steel B is the key factor refining the austenite grain by pinning the migration of austenite grain boundary. The elongated inclusions MnS are ineffective in preventing the austenite grain growth at high heating temperature. For the non-quenched and tempered steel, the continuous casting process should be adopted and the inclusion MnS should be elliptical, smaller in size and distributed uniformly in order to refine the final microstructure and also improve the mechanical properties.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Bo Jiang, Meng Wu, He Sun & Yazheng Liu

  2. R&D Center, Xining Special Steel Co. Ltd., Xining, 810005, China

    Zhilin Wang

  3. R&D Center, Fushun Special Steel Co. Ltd., Fushun, 113001, China

    Zhigang Zhao

Authors
  1. Bo Jiang
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  2. Meng Wu
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  3. He Sun
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  4. Zhilin Wang
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  5. Zhigang Zhao
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  6. Yazheng Liu
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Correspondence to Yazheng Liu.

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Jiang, B., Wu, M., Sun, H. et al. Prediction model of austenite growth and the role of MnS inclusions in non-quenched and tempered steel. Met. Mater. Int. 24, 15–22 (2018). https://doi.org/10.1007/s12540-017-7012-2

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  • DOI: https://doi.org/10.1007/s12540-017-7012-2

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