可視光反射スペクトルを用いたNi基超合金の劣化損傷評価

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  • Evaluation of the degradation of the crystallinity of Ni-base superalloy using reflectance spectrum of visible light

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<p>Thermal power generation is required to be highly efficient due to concerns such as environment and energy problems. In order to improve the efficiency, it is essential to increase operating temperature. In addition, since thermal power generation is expected to control its output to be coexistent with renewable energies, not only creep but also creep-fatigue load is applied to its component because it is required to assure the safe and stable energy supply under random output of the renewable energies. For non-destructive inspection of actual plants, it is indispensable to develop a new technology for observing the degradation of materials used under the harsh conditions in the atmosphere. In this research, the reflection spectrum of the visible light was applied to the observation of micro texture and precipitates with different compositions in Ni-base superalloy (Alloy 617). A creep-fatigue test was applied to a small specimen of Alloy 617, and the reflectance spectrum was measured by irradiating white light on the as-received and damaged specimens. Under the creep-fatigue load, fine intergranular cracks appeared around the center region of the specimen before the final fracture. It was confirmed that the surface roughness in the damaged area increased and the growth of the surface oxide was observed by the spectrum analysis. In addition, the distributions of fine carbides and nitrides were successfully visualized by the spectrum analysis.</p>

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