On the Influence of the Microstructure upon the Fatigue and Corrosion Fatigue Behavior of UNS N07718
Abstract
:1. Introduction
2. Materials and Methods
2.1. Fatigue and Corrosion Fatigue Tests
2.2. Electrochemical Tests
3. Results
3.1. Pitting Susceptibility
3.2. Results of Corrosion Fatigue Tests
4. Discussion
5. Conclusions
- Electrochemical as well as fatigue and CF examinations were successfully conducted on three different metallurgical conditions of alloy 718. The CF behavior was determined using customized rotating bending machines enabling testing in a simulated drilling environment consisting in a 2.25 mol/L Cl-containing solution of pH 9 at 125 °C.
- Among all investigated metallurgical conditions of alloy 718, conditions 1 and 3 have shown the largest fatigue strength in air at room temperature. It is assumed that the large amount of the strengthening phases γ′ and γ″ as well as the refinement of these precipitates confers condition 3 an excellent fatigue behavior. Opposite to conditions 2 and 3, the presence of a limited amount of δ-phase at the grain boundaries in condition 1 is expected to enhance the support effect in the plastic zone at the vicinity of the crack tip.
- While the largest reduction in fatigue strength was determined for condition 1, condition 2 has shown a remarkable CF resistance when exposed to the alkaline 2.25 mol/L Cl-containing brine at 125 °C. This difference cannot be explained only in terms of pitting corrosion susceptibility, because the electrochemical results as well as the appearance of the specimens after testing have confirmed the excellent pitting corrosion resistance of all three investigated metallurgical conditions in the test environment. On the other hand, it was demonstrated that the microstructure of alloy 718 plays a relevant role in its CF behavior. Therefore, the CF behavior of conditions 1 and 2 can be rationalized in terms of their microstructural particularities, in particular, by the presence of δ-phase.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Cr | Mo | Ni | Al | Nb | Ti | Mn | Fe | Rest |
---|---|---|---|---|---|---|---|---|
18.6 | 3.0 | 53.7 | 0.45 | 5.0 | 0.83 | 0.08 | 17.3 | 1.04 |
Condition | OCP (mVSHE) | Ecorr (mVSHE) | Epit (mVSHE) | Erp (mVSHE) |
---|---|---|---|---|
1 | 18 ± 32 | −46 ± 50 | 508 ± 21 | 61 ± 20 |
2 | −62 ± 28 | −53 ± 50 | 460 ± 68 | 86 ± 24 |
3 | 25 ± 13 | −15 ± 10 | 440 ± 69 | 68 ± 10 |
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Engler, C.T.; Klapper, H.S.; Oechsner, M. On the Influence of the Microstructure upon the Fatigue and Corrosion Fatigue Behavior of UNS N07718. Metals 2021, 11, 117. https://doi.org/10.3390/met11010117
Engler CT, Klapper HS, Oechsner M. On the Influence of the Microstructure upon the Fatigue and Corrosion Fatigue Behavior of UNS N07718. Metals. 2021; 11(1):117. https://doi.org/10.3390/met11010117
Chicago/Turabian StyleEngler, Christopher Tom, Helmuth Sarmiento Klapper, and Matthias Oechsner. 2021. "On the Influence of the Microstructure upon the Fatigue and Corrosion Fatigue Behavior of UNS N07718" Metals 11, no. 1: 117. https://doi.org/10.3390/met11010117