Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96
Abstract
:1. Introduction
2. Materials and Methods
3. Creep Model with Pre-Strain Effect
3.1. Micro-Twinning-Based Creep Model
3.2. Creep Model with Pre-Strain Effect
4. Result and Discussion
4.1. Influence of Pre-Strain on the Creep Behaviour
4.2. Influence of Pre-Strain on Microstructure
4.3. Validation of the Creep Rate Model
btp (Å) | Γpt (J/m2) | Γtt (J/m2) | Γtm (J/m2) | Dord at 973 K (m2/s) | x |
---|---|---|---|---|---|
1.44 [38] | 0.7 [25] | 0.02 [25] | 0.03 [39] | 3.24 × 10−20 | 2 btp [25] |
5. Conclusions
- (1)
- The steady-state creep rate and 70 h creep strain continuously increased with the increase in pre-strains. Compared with an unstrained specimen, the creep strain of pre-strained specimens accumulated rapidly in the first few hours, followed by a higher steady-state creep rate. For specimens with more than 1% pre-strain, the steady-state creep rate was more than 10 times greater than that of the unstrained specimen.
- (2)
- Room-temperature pre-tension within 6.04% plastic strain had no obvious influence on the morphology and distribution of γ′ precipitates, whereas the dislocation density continuously increased with the increase in pre-strains. The increases in mobile dislocation density after pre-strain were the main reasons for the increase in creep rates of FGH96 alloys.
- (3)
- The predicted steady-state creep rates showed good agreement with the experimental data; the creep model proposed in this study could capture the pre-strain effect while considering the micro-twinning mechanism.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
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(m−2) | k1 (m−1) | k2 |
---|---|---|
8.27 × 1011 | 1.7490 × 108 | 41.83 |
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Wang, H.; Zhang, J.; Shang, H.; Sha, A.; Cheng, Y.; Duan, H. Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96. Materials 2023, 16, 3874. https://doi.org/10.3390/ma16103874
Wang H, Zhang J, Shang H, Sha A, Cheng Y, Duan H. Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96. Materials. 2023; 16(10):3874. https://doi.org/10.3390/ma16103874
Chicago/Turabian StyleWang, Hao, Jingyu Zhang, Huashan Shang, Aixue Sha, Yangyang Cheng, and Huiling Duan. 2023. "Experiment and Modelling of the Pre-Strain Effect on the Creep Behaviour of P/M Ni-Based Superalloy FGH96" Materials 16, no. 10: 3874. https://doi.org/10.3390/ma16103874