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| Precipitation strengthening of nano-scale TiC in a duplex low-density steel under near-rapid solidification |
| Jian-lei Zhang1,2, Cong-hui Hu1, Yu-xiang Liu1, Yang Yang1, Gang Ji2, Chang-jiang Song1, Qi-jie Zhai1 |
1 Center for Advanced Solidification Technology (CAST), State Key Laboratory of Advanced Special Steel, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;
2 UMR 8207-UMET- Unite′ Mate′riaux et Transformations, University of Lille, French National Centre for Scientific Research (CNRS), French National Institute for Agricultural (INRAE), Centrale Lille Institute, 59000 Lille, France |
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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 c-austenite and d-ferrite, respectively. Ti addition also decreased the volume fraction of gamma-austenite significantly. Correspondingly, the yield strength was increased, but the elongation was significantly decreased due to the significant decrease of c-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 kappa-carbide.
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| Cite this article: |
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Jian-lei Zhang,Cong-hui Hu,Yu-xiang Liu, et al. Precipitation strengthening of nano-scale TiC in a duplex low-density steel under near-rapid solidification[J]. Journal of Iron and Steel Research International, 2021, 28(9): 1141-1148.
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| [1] |
Jia‑jia Qiu, Min Zhang, Gu‑hui Gao, Zhun‑li Tan, Bing‑zhe Bai. Research and modeling on correlation among microstructure, yield strength and process of bainite/martensite steel[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(7): 834-841. |
| [2] |
Wei‑sen Zheng, Yan‑lin He, Xiao‑gang Lu. Thermodynamic modeling of Cr–Al–C and Ni–Al–C systems for low-density steels[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2020, 27(10): 1190-1199. |
| [3] |
J. Chen, J.J. Wang, H. Zhang, W.G. Zhang, C.M. Liu. Evolution of deformation twins with strain rate in a mediummanganese wear-resistant steel Fe–8Mn–1C–1.2Cr–0.2V[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(9): 983-990. |
| [4] |
Hai-long Yi, Lu-ran Zhang, Rui-hai Duan, Xin-zeng Liang. Microstructure–mechanical property relationship in Ti–Mo microalloyed steel with random and interphase precipitates[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(8): 838-845. |
| [5] |
Jian-feng Xiao, Hai-tao Cui, Hong-jian Zhang, Wei-dong Wen. A united tension/compression asymmetry micro-mechanical model for nickel-base single-crystal alloys[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(6): 621-630. |
| [6] |
Guo-chao Li, Xu Cheng, Hua-ming Wang. Improvement of proof-ultimate strength difference in laser additive manufactured Ti–6Al–2V–1.5Mo–0.5Zr–0.3Si alloy by tuning basketweave structure[J]. JOURNAL OF IRON AND STEEL RESEARCH,INTERNATIONAL, 2019, 26(6): 631-636. |
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2021, Vol. 28 
