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Influence of rare earth Ce on hot deformation behavior of as-cast Mn18Cr18N high nitrogen austenitic stainless steel

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Abstract

The hot deformation behavior of Mn18Cr18N and Mn18Cr18N+Ce high nitrogen austenitic stainless steels at 1173–1473 K and 0.01–1 s−1 were investigated by thermal compression tests. The influence mechanism of Ce on the hot deformation behavior was analyzed by Ce-containing inclusions and segregation of Ce. The results show that after the addition of Ce, large, angular, hard, and brittle inclusions (TiN-Al2O3, TiN, and Al2O3) can be modified to fine and dispersed Ce-containing inclusions (Ce-Al-O-S and TiN-Ce-Al-O-S). During the solidification, Ce-containing inclusions can be used as heterogeneous nucleation particles to refine as-cast grains. During the hot deformation, Ce-containing inclusions can pin dislocation movement and grain boundary migration, induce dynamic recrystallization (DRX) nucleation, and avoid the formation and propagation of micro cracks and gaps. In addition, during the solidification, Ce atoms enrich at the front of solid—liquid interface, resulting in composition supercooling and refining the secondary dendrites. Similarly, during the hot deformation, Ce atoms tend to segregate at the boundaries of DRX grains, inhibiting the growth of grains. Under the synergistic effect of Ce-containing inclusions and Ce segregation, although the hot deformation resistance and hot deformation activation energy are improved, DRX is more likely to occur and the size of DRX grains is significantly refined, and the problem of hot deformation cracking can be alleviated. Finally, the microhardness of the samples was measured. The results show that compared with as-cast samples, the microhardness of hot-deformed samples increases significantly, and with the increase of DRX degree, the microhardness decreases continuously. In addition, Ce can affect the microhardness of Mn18Cr18N steel by affecting as-cast and hot deformation microstructures.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51874084) and the Fundamental Research Funds for the Central Universities (No. 2125026).

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Authors and Affiliations

  1. School of Metallurgy, Northeastern University, Shenyang, 110819, China

    Yushuo Li, Yanwu Dong, Zhouhua Jiang, Qingfei Tang, Shuyang Du & Zhiwen Hou

  2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Yanwu Dong & Zhouhua Jiang

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  1. Yushuo Li
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  2. Yanwu Dong
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Correspondence to Yanwu Dong or Zhouhua Jiang.

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Li, Y., Dong, Y., Jiang, Z. et al. Influence of rare earth Ce on hot deformation behavior of as-cast Mn18Cr18N high nitrogen austenitic stainless steel. Int J Miner Metall Mater 30, 324–334 (2023). https://doi.org/10.1007/s12613-021-2355-6

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  • DOI: https://doi.org/10.1007/s12613-021-2355-6

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