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NASA NTRS · Technical Memorandum (TM)
The Effects of Hot Corrosion Pits on the Fatigue Resistance of a Disk Superalloy
Attribution
This is the abstract and citation. Full text lives at NASA NTRS — we link out rather than host. All credit to the authors and Glenn Research Center.
Abstract
Verbatim from NASA NTRS. Not paraphrased, not summarized.
The effects of hot corrosion pits on low cycle fatigue life and failure modes of the disk superalloy ME3 were investigated. Low cycle fatigue specimens were subjected to hot corrosion exposures producing pits, then tested at low and high temperatures. Fatigue lives and failure initiation points were compared to those of specimens without corrosion pits. Several tests were interrupted to estimate the fraction of fatigue life that fatigue cracks initiated at pits. Corrosion pits significantly reduced fatigue life by 60 to 98 percent. Fatigue cracks initiated at a very small fraction of life for high temperature tests, but initiated at higher fractions in tests at low temperature. Critical pit sizes required to promote fatigue cracking were estimated, based on measurements of pits initiating cracks on fracture surfaces.
Authors
- Gabb, Timothy P. NASA Glenn Research Center
- Telesman, Jack NASA Glenn Research Center
- Hazel, Brian General Electric Aviation
- Mourer, David P. General Electric Aviation
Citation: Gabb, Timothy P., Telesman, Jack, Hazel, Brian , et al. (2019). The Effects of Hot Corrosion Pits on the Fatigue Resistance of a Disk Superalloy. Glenn Research Center. NASA NTRS ID 20090033745. https://ntrs.nasa.gov/citations/20090033745 ↗