Stress corrosion cracking (SCC) is a common problem found on aging low-pressure turbine (LP) rotors that operate in a wet/dry stream environment. While much has been published on the growth rate of SCC in turbine rotor-disk materials, incubation time is rarely addressed. Since no effective way has been demonstrated to prevent disk rim SCC from occurring other than to replace the damaged rim with a weld repair of higher chromium content, a better understanding of incubation time could provide operators with a means to treat SCC before cracks are large enough to start to grow. This paper discusses the critical mechanisms involved in the SCC incubation, process and describes a probabilistic approach to make meaningful assessments of incubation time. Data published for General Electric turbine rotors is used to test the model.
- Power Division
Probabilistic Analysis of Turbine Disc SCC Incubation and Propagation
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Lam, TCT, & Dewey, R. "Probabilistic Analysis of Turbine Disc SCC Incubation and Propagation." Proceedings of the 2002 International Joint Power Generation Conference. 2002 International Joint Power Generation Conference. Scottsdale, Arizona, USA. June 24–26, 2002. pp. 381-387. ASME. https://doi.org/10.1115/IJPGC2002-26156
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