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Precipitation of κ-Carbide in a V-Containing Austenite-Based Lightweight Steel

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Abstract

The precipitation behavior of κ-carbides in a Fe–20Mn–9Al–1.2C–1.0V austenite based lightweight steel has been studied. V element is kept in solid solution by near-rapid solidification and precipitated as V-carbides by annealing, respectively. Aging treatments at temperatures of 500 °C to 600 °C were performed for the as-cast and cold-rolled steels. The results show that when the aging temperature is higher than 550 °C, intergranular κ-carbides begin to appear along the austenite boundaries, and coarse κ-carbides greatly reduce the ductility of the alloy. Cold rolling before aging precipitation can promote the precipitation of κ-carbides and accelerate the eutectoid transformation of austenite. V element is slightly enriched in the region of κ-carbides. First principles analysis shows that V segregation into κ-carbides will increase the nucleation barrier energy. After annealing, precipitated V-carbides induce the subsequent precipitation of κ-carbides in the form of band distribution, which is very different from the uniform precipitation without V-carbides.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Nos. 51974184, 51574162), and the National MCF Energy R&D Program of China (No. 2018YFE0306102).

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On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Correspondence to Changjiang Song.

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Liu, M., Li, X., Zhang, Y. et al. Precipitation of κ-Carbide in a V-Containing Austenite-Based Lightweight Steel. Metall Mater Trans A 53, 1231–1243 (2022). https://doi.org/10.1007/s11661-021-06584-z

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  • DOI: https://doi.org/10.1007/s11661-021-06584-z

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