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Analysis of precipitation behavior of MnS in sulfur-bearing steel system with finite-difference segregation model

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Abstract

To further reveal the influence of micro-segregation on the precipitation behavior of MnS in sulfur-bearing steel system, a coupled model of micro-segregation and MnS precipitation was established by the finite-difference method based on various calculation domains and the solid diffusion degrees, and a new controlled diffusion equation with more stable convergence was also used. 49MnVS3 and 1215 steels were used to analyze the influence of calculation domain, segregation model and S content on the precipitation behavior of MnS. The calculation results were verified by a high-temperature confocal laser scanning microscope (HT-CLSM). The results show that the domain has little effect on the precipitation temperature, precipitation solid fraction and precipitation amount of MnS, but affects the precipitation location and segregation of the solutes. For low- and medium-sulfur steels, the temperatures calculated by the diffusion control growth (DCG) model and the Lever model were nearly identical, whereas the temperature calculated by the Scheil model was lower. However, for high-sulfur steels, the precipitation temperatures calculated by three segregation models were nearly same. The precipitation solid fraction is more reasonable to describe the precipitation behavior of MnS. The precipitation behavior of MnS, observed by the HT-CLSM, matches well with that in the DCG model.

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Acknowledgements

The work is financially sponsored by the National Key Research and Development Program of China (No. 2018YFB0704400), the State Key Laboratory of Development and Application Technology of Automotive Steels (Bao-steel Group Co. Ltd.), and the National Natural Science Foundation of China (No. 51671124).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy and School of Materials Science and Engineering, Shanghai University, Shanghai, 200444, China

    De-lin Hu, Hui Liu, Jian-bo Xie, Juan Cheng, Jian Li & Jian-xun Fu

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  1. De-lin Hu
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  2. Hui Liu
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  3. Jian-bo Xie
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  4. Juan Cheng
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Correspondence to Jian-xun Fu.

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Hu, Dl., Liu, H., Xie, Jb. et al. Analysis of precipitation behavior of MnS in sulfur-bearing steel system with finite-difference segregation model. J. Iron Steel Res. Int. 25, 803–812 (2018). https://doi.org/10.1007/s42243-018-0117-0

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