Role of Stabilization Heat Treatment Inducing γ′-γ″ Co-Precipitates and η Phase on Tensile Behaviors of Inconel 706
Abstract
:1. Introduction
2. Experimental Procedures
2.1. Materials and Heat Treatments
2.2. Mechanical Testing
2.3. Microstructure Characterization
3. Results
3.1. Microstructure Characterization
3.2. Tensile Properties
4. Discussion
4.1. Effect of Stabilization Treatment on the Microstructures
4.2. Effect of Stabilization Treatment on Tensile Properties
5. Conclusions
- (1)
- The yield strength and elongation of alloy IN706 decrease with increasing stabilization time.
- (2)
- As the stabilization time increases (from 0 h to 5 h), the η phase undergoes a transition from granular to rod-shaped and needle-like morphology, accompanied by an increase in both size and quantity. Simultaneously, the size of γ′-γ″ co-precipitates increases while their overall number decreases, and the presence of PFZ was found in S3 and S5 samples.
- (3)
- The yield strength of the samples decreases gradually with increasing stabilization time. This phenomenon is due to the influence of the size and volume fraction of γ′-γ″ co-precipitates on the alloy-strengthening effect. With the increase in stabilization time, the size of γ′-γ″ co-precipitates becomes larger and the volume fraction becomes smaller, leading to the decrease in their yield strength.
- (4)
- During room-temperature and in situ tensile tests, it was found that the decrease in elongation during stabilization treatment could be attributed to the presence of η phase at the grain boundaries, as the presence of the η phase on the grain boundaries tends to induce stress concentration, which leads to cracks at the grain boundaries, resulting in a decrease in the plasticity of the samples.
- (5)
- These results can provide theoretical guidance for the development and application of high-performance IN706 alloys.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Samples | Heat Treatment | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | References |
---|---|---|---|---|---|
S0 | Stabilization 0 h | 1031 | 1258 | 28 | Current study |
S1 | Stabilization 1 h | 982 | 1242 | 24 | Current study |
S3 | Stabilization 3 h | 997 | 1256 | 23 | Current study |
S5 | Stabilization 5 h | 980 | 1240 | 20 | Current study |
S0-1 | Stabilization 0 h | 1085 | 1262 | 22 | [1] |
S3-1 | Stabilization 3 h | 979 | 1245 | 17 | [1] |
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Liu, C.; Gao, L.; Wu, H.; Miao, K.; Wu, H.; Li, R.; Li, X. Role of Stabilization Heat Treatment Inducing γ′-γ″ Co-Precipitates and η Phase on Tensile Behaviors of Inconel 706. Metals 2024, 14, 826. https://doi.org/10.3390/met14070826
Liu C, Gao L, Wu H, Miao K, Wu H, Li R, Li X. Role of Stabilization Heat Treatment Inducing γ′-γ″ Co-Precipitates and η Phase on Tensile Behaviors of Inconel 706. Metals. 2024; 14(7):826. https://doi.org/10.3390/met14070826
Chicago/Turabian StyleLiu, Chenglu, Lei Gao, Hao Wu, Kesong Miao, He Wu, Rengeng Li, and Xuewen Li. 2024. "Role of Stabilization Heat Treatment Inducing γ′-γ″ Co-Precipitates and η Phase on Tensile Behaviors of Inconel 706" Metals 14, no. 7: 826. https://doi.org/10.3390/met14070826