Investigations on fatigue curves in dependency of water quality for nickel-martensitic steels

With the need for flexible operation, Francis runners are exposed to various operating conditions outside the traditional operating range. To grant sufficient fatigue life, a deep knowledge of both loads and material behavior is mandatory. With the change in operation diverse stress amplitudes and n...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2021-06, Vol.774 (1), p.12059
Main Authors: Leibing, B, von Locquenghien, F, Rückle, D, Schellenberg, G
Format: Article
Language:English
Subjects:
Corrosion fatigue
Fatigue life
Fatigue tests
Martensitic stainless steels
Nickel
Turbines
Water quality
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Summary:With the need for flexible operation, Francis runners are exposed to various operating conditions outside the traditional operating range. To grant sufficient fatigue life, a deep knowledge of both loads and material behavior is mandatory. With the change in operation diverse stress amplitudes and number of cycles have to be considered for the comparison with fatigue curves. Hydro power turbines are exposed to possible corrosion attack due to the surrounding water environment, which is a relevant impact on the fatigue curves. Therefore an overview of parameters that influence the corrosivity will be given. From an evaluation of a database that contains water quality data of worldwide hydro power projects, different water qualities are defined to perform fatigue tests with the influence of a corrosive medium. For selected water qualities, preliminary material test results will be presented.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/774/1/012059