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Investigation of V–N Micro-alloying Using Nitrogen Bottom Blowing

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Abstract

Herein, a novel method of V–N micro-alloying was developed by adding ferrovanadium and nitrogen bottom blowing. For comparison, melting experiments were carried out by directly adding ferrovanadium nitride. Results indicate that nitrogen content increases rapidly and can reach the actual production level via nitrogen bottom blowing. TEM observations show that carbonitrides precipitate along the dislocation line, on the boundary of cementite and ferrite–cementite, and the ferrite grain boundary. Meanwhile, higher the nitrogen content in the steel, more the precipitates and higher dispersion will form, which indicates that addition of ferrovanadium first is better than blowing nitrogen first. Furthermore, the size, distribution and dispersion of carbonitrides obtained via the method of firstly adding ferrovanadium are comparable with that of directly adding ferrovanadium nitride. The results reveal that it is feasible to realize V–N micro-alloying by adding ferrovanadium and nitrogen bottom blowing.

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Acknowledgments

The authors are grateful for the support from Graduate Student Innovation Fund of North China University of Science and Technology “Basic Research on V–N micro-alloying Using Nitrogen Bottom Blowing and Adding Ferrovanadium” (Grant No. 2018B01), National Natural Science Foundation of China “Fundamental Research of Preparating Sm–Fe–N Powder with High Pressure Metallurgy and Gas Atomizating Quenching” (Grant No. 51574104) and “Research on Mechanism of High Pressure Nitriding Melting and Solidification in Stainless Steel Micro-bath” (Grant No. 51774139), and Natural Science Foundation of Hebei Province (Grant No. E2019209597).

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Authors and Affiliations

  1. School of Metallurgy and Energy, North China University of Science and Technology, Tangshan, 063009, China

    Guolong Ni, Dingguo Zhao, Shuhuan Wang & Chunyan Song

  2. Tangshan Key Laboratory of Special Metallurgy and Material Manufacture, Tangshan, 063009, China

    Guolong Ni, Dingguo Zhao, Shuhuan Wang & Chunyan Song

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  1. Guolong Ni
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  2. Dingguo Zhao
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Correspondence to Shuhuan Wang.

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Ni, G., Zhao, D., Wang, S. et al. Investigation of V–N Micro-alloying Using Nitrogen Bottom Blowing. Trans Indian Inst Met 73, 2693–2701 (2020). https://doi.org/10.1007/s12666-020-02083-8

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