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Phase Transformation and Carbide Precipitation of Functional Gradient Semi-solid 9Cr18 Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The unique phase transformation and carbide evolution in 9Cr18 steel were investigated during semi-solid forming and subsequent heat treatment. The functional gradient thixoforging 9Cr18 component was divided into inner area and edge area. Microstructure evolution was different at each area. After semi-solid cooling, the solid particles in the inner area were retained as meta-austenite. During annealing, M23C6 carbide began to precipitate when temperature reached 700 °C. Martensite transformation occurred when temperature reached 800 °C. The occurrence of M23C6 carbide and martensite structure would be harmful to the mechanical properties of inner area. In the edge area, the liquid underwent eutectic transformation to form bar-shape M7C3 carbide and secondary austenite after semi-solid cooling. The width of bar-shape carbide would decrease during annealing. By controlling the carbide evolution, we could tailor the functional gradient material with required property.

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Acknowledgements

The research was supported by the National Natural Science Foundation of China (No. 51175036) and the authors are also grateful to the support from the China Scholarship Council (CSC) (Grant No. 201606460014).

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Authors and Affiliations

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

    Yong-Jin Wang & Ren-Bo Song

  2. Institute of Industrial Science, The University of Tokyo, Komaba 4-6-1, Meguro, Tokyo, 153-8505, Japan

    Yong-Jin Wang

  3. Ansteel Mining Engineering Corporation, Anshan, 114004, China

    Ren-Feng Song

Authors
  1. Yong-Jin Wang
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  2. Ren-Bo Song
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Correspondence to Ren-Bo Song.

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Wang, YJ., Song, RB. & Song, RF. Phase Transformation and Carbide Precipitation of Functional Gradient Semi-solid 9Cr18 Steel. Acta Metall. Sin. (Engl. Lett.) 31, 823–830 (2018). https://doi.org/10.1007/s40195-018-0723-7

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  • DOI: https://doi.org/10.1007/s40195-018-0723-7

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