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Precipitation strengthening of nano-scale TiC in a duplex low-density steel under near-rapid solidification

Abstract : Precipitation strengthening of nano-scale TiC is a promising method to improve mechanical properties of Fe–16Mn–9Al–0.8C (wt.%) low-density steel. This work attempted to introduce nano-scale TiC precipitates by adding 1 wt.% Ti element. The experimental results show that these precipitates with the total fraction of about 2 vol.% were formed and no coarse precipitates were observed despite the high Ti addition. It was interesting that the polygonal and needle-shaped TiC precipitates were observed in γ-austenite and δ-ferrite, respectively. Ti addition also decreased the volume fraction of γ-austenite significantly. Correspondingly, the yield strength was increased, but the elongation was significantly decreased due to the significant decrease of γ-austenite. Comparing with the Ti-free steel, the formation of TiC precipitates was the main reason for the increase in yield strength of Ti-bearing steel, and TiC precipitates also led to a higher strain hardening index at the first deformation stage. TiC precipitates promoted the Orowan strengthening, resulting in a higher strain hardening capability than Ti-free steel reinforced by shearable κ-carbide.
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https://hal.univ-lille.fr/hal-03066490
Contributeur : Lilloa Université de Lille <>
Soumis le : mardi 15 décembre 2020 - 12:15:00
Dernière modification le : mercredi 16 décembre 2020 - 03:38:37

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Jian-Lei Zhang, Cong-Hui Hu, Yu-Xiang Liu, Yang Yang, Gang Ji, et al.. Precipitation strengthening of nano-scale TiC in a duplex low-density steel under near-rapid solidification. Journal of Iron and Steel Research International, 2020, Journal of Iron and Steel Research International, ⟨10.1007/s42243-020-00511-z⟩. ⟨hal-03066490⟩

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