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Thermomechanical fatigue tests development and life prediction of a nickel base superalloy

Autores: Garcia de la Yedra, A.; Pedrejón Bardo, José Luis; Martín Meizoso, Antonio; Rodriguez, R.
ISSN: 0732-8818
Volumen: 40
Número: 2
Páginas: 777 - 787
Fecha de publicación: 2016
Thermomechanical fatigue (TMF) tests are carried out in order to characterize the behavior of turbine blades and vanes materials: superalloys. These materials suffer high stress levels at very high temperature and to simulate these extreme operation conditions a test-piece is subjected to controlled thermal and mechanical strain waveforms. In this paper, a test procedure is explained, which is unusual due to the fact that the heating system is based on direct resistance method and temperature is controlled by means of a pyrometer. For this purpose, emissivity evolution was studied. The effectiveness of the method, as well as some other important aspects such as alignment and a proper thermal-mechanical strain decoupling are discussed. Finally, some preliminary results of the cyclic behavior and life prediction of C-1023 nickel base superalloy are introduced. This also includes an analysis of specimens fractography.