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Power Plant Life Management and Performance Improvement by J Oakey

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8.

Creep, fatigue and microstructural degradation in gas turbine superalloys

P. Auerkari,     VTT Technical Research Centre of Finland, Finland

Abstract:

Creep and fatigue are important and life-limiting damage mechanisms for many gas turbine components and therefore must be accounted for in design. Creep is promoted by high levels of stress and temperature that also drive microstructural changes in turbine materials. Fatigue is caused by fluctuating loads from, for example, rotation, vibration or thermal cycling, and can also limit component design and life at more modest temperatures. The main characteristics of creep, fatigue, microstructural damage and their combined impact are introduced below, with emphasis on aspects relevant in life ...

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