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Effect of Mg addition on temper embrittlement in 2.25Cr–1Mo steel doped with 0.056% P–Mg segregation behavior at grain boundary

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Abstract

To verify the microalloying function and segregation behavior of trace Mg at grain boundary in steel, the 2.25Cr–1Mo steel doped with 0.056% P containing different Mg contents was refined with a vacuum-induction furnace. The effects of trace Mg addition on the temper embrittlement susceptibility of 2.25Cr–1Mo steel were studied by step-cooling test and the segregation behavior of Mg at grain boundary was explored by Auger electron spectroscopy. It is shown that P-induced temper embrittlement susceptibility can be reduced after subjecting to step-cooling treatment with trace Mg addition, mainly benefited from the segregation of Mg at grain boundary. This segregation can decrease the segregation amounts of P and S, especially for P, and increase the grain boundary cohesion, reducing the adverse effect on temper embrittlement caused by P and S.

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Acknowledgements

The authors thank the National Natural Science Foundation of China for their financial support under contract No. 51801210. The authors also thank Prof. S.N. Zhang in Institute of Metal Research for valuable discussions and L.P. Yang in Tsinghua University for her careful analysis and testing.

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Authors and Affiliations

  1. Shi-changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Science, Shenyang, 110016, Liaoning, China

    Xiao-bing Li, Xin Dong, Peng-xiang Zhao, Wei-wei Xing, Lei-lei Ding, Ying-che Ma & Kui Liu

  2. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Shenyang, 110014, Liaoning, China

    Xiao-bing Li, Wei-wei Xing, Lei-lei Ding, Ying-che Ma & Kui Liu

  3. School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, Liaoning, China

    Xin Dong & Nan-nan Zhang

  4. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, Anhui, China

    Peng-xiang Zhao

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  1. Xiao-bing Li
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  2. Xin Dong
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  3. Peng-xiang Zhao
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Correspondence to Xiao-bing Li or Ying-che Ma.

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Li, Xb., Dong, X., Zhao, Px. et al. Effect of Mg addition on temper embrittlement in 2.25Cr–1Mo steel doped with 0.056% P–Mg segregation behavior at grain boundary. J. Iron Steel Res. Int. 28, 1259–1267 (2021). https://doi.org/10.1007/s42243-020-00506-w

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  • DOI: https://doi.org/10.1007/s42243-020-00506-w

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