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Simultaneous Increase of Both Strength and Ductility of Medium Mn Transformation-Induced Plasticity Steel by Vanadium Alloying

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Abstract

In general, microalloying such as vanadium (V) is considered to deteriorate the mechanical stability of austenite grains in medium Mn steel due to the consumption of C content. In this paper, we show that the mechanical stability of austenite grains could be optimized by V-alloying. This is because the V-alloying will refine the austenite grain size and tends to stabilize the austenite grains. The competition between the grain refinement and the reduced C content results in proper mechanical stability of austenite grains, providing continuous transformation-induced plasticity (TRIP) effect. In addition, the V-alloying suppresses the formation of intergranular cracks, leading to a ductile fracture morphology and a large non-uniform elongation.

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M.X. Huang acknowledges the financial support from the Research Grants Council of Hong Kong (Nos. HKU719712E, HKU712713E, 17203014) and National Science Foundation of China (No. 51301148).

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Correspondence to M. X. Huang.

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Manuscript submitted October 13, 2017.

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He, B.B., Huang, M.X. Simultaneous Increase of Both Strength and Ductility of Medium Mn Transformation-Induced Plasticity Steel by Vanadium Alloying. Metall Mater Trans A 49, 1433–1438 (2018). https://doi.org/10.1007/s11661-018-4517-3

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  • DOI: https://doi.org/10.1007/s11661-018-4517-3

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