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The degradation of Inconel 718 wrought alloy, occurred during scrvicc at clcvatcd temperatures, has been evaluated by the ,thermal electromotive force method in this study. This method is used as one of the various non-destructive inspection methods. It was tried to determine the degree of the degradation by this quantitative measurement. The specimens cut from turbine disk forgings with different grain sizes (ASTM6 and 10) were exposed at various temperatures simulating actual turbine disk service condition. The increase of thermal electromotive force value after exposure due to the morphology changes of 6 phase from 7 ” phase because of containing the niobium. The increase of thermal electromotive force value with these microstructure changes corresponded to the decrease of tensile properties at 823K(550 “C). It was confirmed that the inspection sensitivity of thermal electromotive force method was superior to other non-destructive inspection method such as hardness measurement. In application for the actual reliable inspection, it is proposed that thermal electromotive force method is applied for using relative difference in value between the rim portion and the less heated bore portion in the actual disk. Then, it is not ncccssary to consider effects of the chemical compositions and grain size in the different disks on this value. Moreover, this method has a great advantage that the degree of the degradation can be estimated quantitatively without damaging the parts and easy to adopt at the shop or user. Superalloys 718,6X5,706 and Various Derivatives Ediited by E.A. Loria The Minerals, Metals&Materials Society, 1994

Development of the Degradation Inspection Method of Inconel 718 Serviced at Elevated Temperatures