The paper deals with the use of small samples for fatigue tests of two types of steels used for power plant components. The main advantage of small fatigue samples is the possibility of their use in cases, where sufficient amount of material is not available for standard test specimens manufacturing. This problem can occur in cases of power plant components, e.g. steam turbine rotors or pressure vessels. The results of the small sample tests are afterwards correlated with the results of standard fatigue test specimens. In addition, different ways of sample manufacturing are compared. The small samples are produced either by machining, or waterjet cutting. The stress concentration which occurs in the small fatigue samples was determined by finite element method. The performed tests proved an acceptable correlation of small and standard test specimen results.Keywords: Small fatigue test, P92, 15CH2NMFA, power plant parts
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