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| Effect of Annealing on Microstructure and Mechanical Properties of Ultrafine-grained TWIP Steel Produced by Severely Asymmetric and Symmetric Rolling |
Xuefeng YAO1, Bin FU1,2, Liming FU1( ), Daoda ZHANG3, Dengcan YAO3, Aidang SHAN1 |
1 Department of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
2 School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China.
3 Jiangxi Mechanical Science Institute, Nanchang 330002, China. |
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Cite this article:
Xuefeng YAO, Bin FU, Liming FU, Daoda ZHANG, Dengcan YAO, Aidang SHAN. Effect of Annealing on Microstructure and Mechanical Properties of Ultrafine-grained TWIP Steel Produced by Severely Asymmetric and Symmetric Rolling. Chinese Journal of Materials Research, 2017, 31(11): 809-817.
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Abstract The effect of annealing temperature on microstructure and mechanical properties of TWIP steel (Fe-0.5C-18.6Mn-1.5Al-0.5Si) is investigated, while the steel was produced aforehand by severe symmetric and asymmetric rolling at room temperature. The results show that the grain size is significantly refined after severe asymmetric and symmetric rolling, and the ultimate tensile strength (UTS) increased from 593 MPa to 2021 MPa. The severely rolled TWIP steel shows no recrystallization when annealed below 500℃, partial recrystallization when annealed between 500-600℃, and full recrystallization when annealed above 700℃. With the increasing annealing temperature, the strength decreases while the elongation increases. Specifically, the UFG (Ultrafine-grained) TWIP steel with an average grain size of 500nm and excellent mechanical properties can be obtained when annealed at 700℃, i.e. the UTS, elongation and product of strength and elongation of the steel are 1114 MPa,59.4 % and 66.2 GPa·%, respectively. Moreover, when annealed between 500-600℃, there existed many dispersive fine-grained intermetallic compounds with DO3-type crystallographic structure in the produced steel, which can significantly enhance the strength of the steel
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Received: 07 December 2016
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| Fund: Supported by National Science Foundation for Post-doctoral Scientists of China (No. 2015M581608), Foundation of Department of Science and Technology of Jiangxi Province (No. 20151BDH80082) and National Key Research and Development Program of China (No. 2014ZX07214-002) |
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