Microstructure and Mechanical Properties of a High-Mn TWIP Steel Subjected to Cold Rolling and Annealing
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Cold Rolling
3.2. Annealing Behavior
3.3. Mechanical Properties
4. Conclusions
- The cold rolling resulted in significant strengthening of the steel. The hardness increased from 1900 to almost 6000 MPa after rolling reduction of 80%.
- Annealing behavior was characterized by the development of recovery and recrystallization. Recovery took place during annealing at temperatures of 673 and 773 K, leading to fractional softening below 0.2. On the other hand, the static recrystallization readily developed during annealing at 873 and 973 K, leading to fractional softening of about 0.8.
- The recrystallized grain size depended on annealing temperature and rolling reduction. An increase in the rolling reduction from 20% to 80% led to a decrease in the mean recrystallized grain size from about 8 to 1.6 μm after subsequent annealing at 923 K and to 1.1 μm after annealing at 873 K.
- The yield strength of the recovered and recrystallized steel samples, as well as partially recrystallized ones, could be expressed by a modified Hall-Petch type relationship taking into account the fractional contributions from grain size strengthening and dislocation strengthening.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Kalinenko, A.; Kusakin, P.; Belyakov, A.; Kaibyshev, R.; Molodov, D.A. Microstructure and Mechanical Properties of a High-Mn TWIP Steel Subjected to Cold Rolling and Annealing. Metals 2017, 7, 571. https://doi.org/10.3390/met7120571
Kalinenko A, Kusakin P, Belyakov A, Kaibyshev R, Molodov DA. Microstructure and Mechanical Properties of a High-Mn TWIP Steel Subjected to Cold Rolling and Annealing. Metals. 2017; 7(12):571. https://doi.org/10.3390/met7120571
Chicago/Turabian StyleKalinenko, Alexander, Pavel Kusakin, Andrey Belyakov, Rustam Kaibyshev, and Dmitri A. Molodov. 2017. "Microstructure and Mechanical Properties of a High-Mn TWIP Steel Subjected to Cold Rolling and Annealing" Metals 7, no. 12: 571. https://doi.org/10.3390/met7120571