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Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

By tailoring the reverse austenite transformation behavior of 9Cr oxide dispersion strengthened (ODS) ferritic/martensitic steels, the residual ferrite in ODS steels can be controlled. The reverse austenite transformation behavior of ODS steels is closely related to the initial microstructure conditions prior to austenite transformation. For the spark plasma sintered steels, both the amount and size of residual ferrite decrease with increasing heating rate. Nevertheless, high heating rate will increase the amount and size of residual ferrite in annealed ODS steels. As an isothermal treatment is performed at temperatures above Ac1, lower isothermal temperature has a more evident effect on the ferrite distribution in spark plasma sintered steels than that in annealed ones.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 52034004) and the China Postdoctoral Science Foundation Grant (No. 2019M650028).

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Authors and Affiliations

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

    Xiaosheng Zhou & Hao Chen

  2. State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science and Engineering, Tianjin University, Tianjin, 300354, China

    Chenxi Liu & Yongchang Liu

Authors
  1. Xiaosheng Zhou
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  2. Hao Chen
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  3. Chenxi Liu
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  4. Yongchang Liu
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Correspondence to Yongchang Liu.

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Zhou, X., Chen, H., Liu, C. et al. Residual Ferrite Control of 9Cr ODS Steels by Tailoring Reverse Austenite Transformation. Acta Metall. Sin. (Engl. Lett.) 34, 187–195 (2021). https://doi.org/10.1007/s40195-020-01171-4

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  • DOI: https://doi.org/10.1007/s40195-020-01171-4

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