Fundamental Improvement of Creep Resistance of New-Generation Nano-Oxide Strengthened Alloys via Hot Rotary Swaging Consolidation
Abstract
:1. Introduction
2. Materials and Methods
3. Mechanical Testing
4. Microstructure Characterization
5. Discussion
6. Conclusions
- Two batches of the Fe-10Al-3Y2O3-1Ti new-generation ODS alloys are prepared by hot consolidation of mechanically alloyed powder using (i) rolling and (ii) rotary swaging.
- Secondary recrystallization of the hot rotary swaging consolidated specimens featuring ultra-fine-grained microstructure leads to rather coarse grains significantly elongated in the direction of swaging axis.
- Although the microstructure of nano-oxides in the secondary recrystallized grains of the ODS alloy consolidated by hot rolling is significantly more regular and finer than that of the ODS alloy consolidated by hot rotary swaging, the strength of the latter at 1100 °C is by a factor of 1.5 to 2 higher than that of the first one.
- The creep strength of the present new-generation of ODS alloy at 1100 °C is predominantly determined by the morphology of grain boundaries being the weakest link due to their limited cohesive strength.
- The creep strength at 1100 °C of the new-generation ODS alloys consolidated by hot rotary swaging exceeds that of top commercial ODS alloy by more than 30%.
- The hot consolidation of the ODS powder via rotary swaging compared to rolling is proven advantageous for production of the new-generation high-strength ODS alloys for application at temperatures 1100–1300 °C.
Author Contributions
Funding
Conflicts of Interest
References
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Svoboda, J.; Kunčická, L.; Luptáková, N.; Weiser, A.; Dymáček, P. Fundamental Improvement of Creep Resistance of New-Generation Nano-Oxide Strengthened Alloys via Hot Rotary Swaging Consolidation. Materials 2020, 13, 5217. https://doi.org/10.3390/ma13225217
Svoboda J, Kunčická L, Luptáková N, Weiser A, Dymáček P. Fundamental Improvement of Creep Resistance of New-Generation Nano-Oxide Strengthened Alloys via Hot Rotary Swaging Consolidation. Materials. 2020; 13(22):5217. https://doi.org/10.3390/ma13225217
Chicago/Turabian StyleSvoboda, Jiří, Lenka Kunčická, Natália Luptáková, Adam Weiser, and Petr Dymáček. 2020. "Fundamental Improvement of Creep Resistance of New-Generation Nano-Oxide Strengthened Alloys via Hot Rotary Swaging Consolidation" Materials 13, no. 22: 5217. https://doi.org/10.3390/ma13225217