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Formation Mechanism and Nucleation Effect of Ti2O3–TiN Complex Nucleus at Solidification Front of 18Cr Ferritic Stainless Steel

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Abstract

Formation mechanism of Ti2O3–TiN complex nucleus and its nucleation effect on δ-Fe at solidification front of Fe-18Cr ferritic stainless steel was investigated through experimental and theoretical methods. According to the equilibrium calculation, Ti2O3 will crystallize in the molten steel before solidification and TiN will not form until the solid phases appear. However, complex nucleus and equiaxed grains exist in the edge of Ti-bearing ingot, where the solidification velocity and temperature gradient are high. Therefore, complex nucleus is indicated to be formed at solidification front and a non-equilibrium solidification model for multi-component alloy was established to investigate the dendrite tip interface phenomenon. The calculation results exhibit an element enrichment at solidification front and explain well with the formation of complex nucleus before solidification. It is also found that there is approximate lattice matching between TiN, and Ti2O3, δ-Fe on the basis of disregistry theory. These results are consistent with the observed complex nucleus and the increased equiaxed zone ratio (EZR) of Ti-bearing ferritic stainless steel.

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Acknowledgment

This work was supported by the National Natural Science Foundation of China [Project Grant No. 51374020].

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  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology, Beijing, Beijing, 100083, China

    Yuyang Hou & Guoguang Cheng

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  1. Yuyang Hou
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Manuscript submitted September 23, 2018.

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Hou, Y., Cheng, G. Formation Mechanism and Nucleation Effect of Ti2O3–TiN Complex Nucleus at Solidification Front of 18Cr Ferritic Stainless Steel. Metall Mater Trans B 50, 1351–1364 (2019). https://doi.org/10.1007/s11663-019-01540-0

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