Effect of Annealing and Double Aging on the Microstructure and Mechanical Properties of Hot-Rolled Al17Cr10Fe36Ni36Mo1 Alloy
Abstract
:1. Introduction
2. Experiments
2.1. Preparation and Pretreatment of Samples
2.2. Microstructural Characterization and Tensile Mechanical Property Tests
3. Results and Discussion
3.1. Short-Time Annealing at Different Temperatures
3.2. Solution and Aging
4. Conclusions
- (1)
- The precipitation behaviors of the HR alloy can be affected by different annealing temperatures. In the FCC matrix, some B2 nanoprecipitates were observed in the HR700 alloy, the needle-like B2 structures were precipitated in the HR800 alloy, the island-like B2 precipitates were found in the HR1000 alloy, and the B2 precipitates rapidly coarsened into micron-scale structures in the HR1150 alloy. In addition, the BCC particles precipitated in the B2 matrix of the HR alloy were completely dissolved above 1000 °C.
- (2)
- The HR-DA alloy showed better comprehensive mechanical properties than the HR-SA alloy. After the HR alloys were treated with SSA and SDA, short rod-like L12 precipitates were observed in the FCC matrix of both the HR-SA and HR-DA alloys, and the number and size of the L12 phases in the HR-DA alloy were greater than those of the HR-SA alloy. The L12 precipitates can greatly improve the strength of the alloy by hindering the movement of dislocation. Therefore, the HR-DA alloy shows the excellent tensile strength of 1365.7 ± 9.5 MPa and fracture elongation of 14.2 ± 1.5% at room temperature.
- (3)
- The HR-DA alloy also showed acceptable mechanical properties at a high temperature. The L12 phases and B2 nanoprecipitates were observed in the FCC matrix and FCC grain boundaries, respectively. The high-density L12 phases significantly contributed to the yield strength and the B2 nanoprecipitates can effectively hinder the dislocation movement as well as the grain boundary sliding. These results led to the HR-DA alloy obtaining a high tensile strength of 641.4 ± 6.0 MPa and a fracture elongation of 16.9 ± 1.0% at 700 °C, showing great potential for elevated temperatures applications.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Alloys | σs, MPa | σb, Mpa | ɛp, % |
---|---|---|---|
HR | 471.2 ± 6.5 | 1019.2 ± 8.5 | 20.1 ± 1.0 |
HR700 | 568.4 ± 5.0 | 1107.2 ± 9.0 | 22.2 ± 1.5 |
HR850 | 400.8 ± 5.5 | 980.3 ± 7.0 | 31.6 ± 1.5 |
HR1000 | 414.1 ± 7.0 | 1008.1 ± 9.5 | 28.1 ± 1.0 |
HR1150 | 360.7 ± 5.0 | 955.9 ± 7.5 | 23.4 ± 1.0 |
Temperature °C | σs, MPa | σb, Mpa | ɛp, % |
---|---|---|---|
20 | 813.2 ± 6.5 | 1365.7 ± 11.5 | 14.2 ± 1.0 |
600 | 702.6 ± 7.0 | 913.1 ± 8.5 | 20.1 ± 1.5 |
700 | 576.8 ± 5.5 | 641.4 ± 6.0 | 16.9 ± 1.0 |
800 | 339.1 ± 7.5 | 346.3 ± 7.0 | 43.5 ± 1.5 |
900 | 152.9 ± 5.0 | 163.6 ± 5.5 | 102.2 ± 1.0 |
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Qiu, Y.; Shi, X.; Liu, X.; Chen, Z.; Wang, J.; Liu, X.; Bai, X.; He, F.; Wang, Z. Effect of Annealing and Double Aging on the Microstructure and Mechanical Properties of Hot-Rolled Al17Cr10Fe36Ni36Mo1 Alloy. Metals 2024, 14, 726. https://doi.org/10.3390/met14060726
Qiu Y, Shi X, Liu X, Chen Z, Wang J, Liu X, Bai X, He F, Wang Z. Effect of Annealing and Double Aging on the Microstructure and Mechanical Properties of Hot-Rolled Al17Cr10Fe36Ni36Mo1 Alloy. Metals. 2024; 14(6):726. https://doi.org/10.3390/met14060726
Chicago/Turabian StyleQiu, Yunji, Xinbo Shi, Xiaoming Liu, Zhihua Chen, Jianbin Wang, Xin Liu, Xiaoyu Bai, Feng He, and Zhijun Wang. 2024. "Effect of Annealing and Double Aging on the Microstructure and Mechanical Properties of Hot-Rolled Al17Cr10Fe36Ni36Mo1 Alloy" Metals 14, no. 6: 726. https://doi.org/10.3390/met14060726