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Effect of Nb Addition on Dendrite Growth and Equiaxed Grain Ratio of Fe-20 Pct Cr High-Purity Ferritic Stainless Steel

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ABSTRACT

The acquisition of a high equiaxed zone ratio (EZR) is crucial for ferritic stainless steel (FSS). The main method of achieving this is to use effective particles to promote heterogeneous nucleation. In this study, an increased EZR was obtained owing to dendritic growth kinetics influenced by Nb addition. The EZR increased from 12 to 44 pct when 0.7 wt pct Nb was added to the FSS. The mechanism of increase of the EZR was analyzed by modified dendritic growth kinetics using the Kurz–Giovanola–Trivedi model coupled with thermodynamic data from ThermoCalc. The dendritic growth kinetics for Fe-20 pct Cr and Fe-20 pct Cr-0.7 pct Nb can be expressed as \( V = 2.258 \times 10^{ - 5} \cdot \Delta T^{3.617} \) and \( V = 5.755 \times 10^{ - 7} \cdot \Delta T^{3.248} \), respectively, which means that undercooling (ΔT) of Fe-20 pct Cr-0.7 pct Nb was larger than that of Fe-20 pct Cr under the same solidification velocity (V). The undercooling enlarged at the dendrite tip then provided favorable nucleation conditions for FSS and increased the EZR. The as-cast structure, simulated by the cellular automaton–finite element model combined with modified dendritic growth kinetics, compared well with an actual ingot.

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ACKNOWLEDGMENT

This study 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, Shijian Li & Guoguang Cheng

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  1. Yuyang Hou
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  2. Shijian Li
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Correspondence to Guoguang Cheng.

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Manuscript Submitted April 13, 2018.

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Hou, Y., Li, S. & Cheng, G. Effect of Nb Addition on Dendrite Growth and Equiaxed Grain Ratio of Fe-20 Pct Cr High-Purity Ferritic Stainless Steel. Metall Mater Trans A 49, 5445–5457 (2018). https://doi.org/10.1007/s11661-018-4838-2

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  • DOI: https://doi.org/10.1007/s11661-018-4838-2

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