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Effects of Nitrogen on the Morphology and Evolution of M2C Eutectic Carbides in Fe-Mo-W-Co-Cr-V-C Alloy

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Abstract

The effects of nitrogen on the characteristics and evolutions of M2C eutectic carbides in the Fe-Mo-W-Co-Cr-V-C alloy were investigated in both as-cast and wrought states. Microstructural observation, electrolytic extraction method, and x-ray diffraction analysis were conducted on the specimens. The results showed that, in the case of low nitrogen concentration (w[N]% = 0.006) in the as-cast alloy, lamellar M2C carbides were found to be the dominant precipitate. Nitrogen addition resulted in M2C carbide precipitate as a fibrous structure rather than a lamellar structure. Fibrous M2C were more likely to decompose into fine spherical M6C and V(C,N) during the forging process compared to lamellar M2C. Accordingly, it was suggested that adding nitrogen to Fe-Mo-W-Co-Cr-V-C alloy was required to achieve small dimensions and homogeneous distribution of carbides.

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Acknowledgements

This research was sponsored by the National Natural Science Foundation of China (NSFC) by a Grant of No. U1560203.

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing, 100083, People’s Republic of China

    Yi-Wa Luo, Han-Jie Guo & Jing Guo

  2. Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing, 100083, People’s Republic of China

    Yi-Wa Luo, Han-Jie Guo, Jing Guo & Fei Wang

  3. Tianjin Cisri-Harder Materials and Technology Co. LTD, Central Iron and Steel Research Institute (CISRI), Tianjin, 301721, People’s Republic of China

    Xiao-Lin Sun

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  1. Yi-Wa Luo
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  2. Han-Jie Guo
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Correspondence to Han-Jie Guo.

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Luo, YW., Guo, HJ., Sun, XL. et al. Effects of Nitrogen on the Morphology and Evolution of M2C Eutectic Carbides in Fe-Mo-W-Co-Cr-V-C Alloy. JOM 72, 326–332 (2020). https://doi.org/10.1007/s11837-018-3173-9

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  • DOI: https://doi.org/10.1007/s11837-018-3173-9

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