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2020 | OriginalPaper | Chapter

Initial Intergranular Cracking of Ni-Base Superalloys Due to the Degradation of the Crystallinity of Grain Boundaries Under Creep-Fatigue Loading

Authors : Wataru Suzuki, Yifan Luo, Kenta Ishihara, Kens Suzuki, Hideo Miura

Published in: Proceedings of the Third International Conference on Theoretical, Applied and Experimental Mechanics

Publisher: Springer International Publishing

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Abstract

The mechanism of the drastic decrease in the lifetime of Ni-base superalloy, Alloy 617 under creep-fatigue loading at elevated temperatures was clarified by using EBSD (Electron Back-Scatter Diffraction) analysis. The degradation process was monitored by using an intermittent creep-fatigue test and EBSD analysis. The change of the crystallinity of grains and grain boundaries was quantitatively analyzed by using the image quality (IQ) value obtained from the EBSD analysis. The IQ value indicated the density of defects such as vacancies, dislocations, local strain, and so on. The decrease in the IQ value corresponded to the decrease in the crystallinity of the observed area. The accumulation of fine voids was found to be accelerated under the creep-fatigue loading, and it caused the drastic decrease of not only the IQ value, but also the strength of the grain boundaries. Intergranular cracking started to occur when the crystallinity of grain boundaries decreased to the critical value due to the degradation of the crystallinity caused by the local accumulation of dislocations and voids around the grain boundaries.

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Literature
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go back to reference Suzuki, W., Ishihara, K., Kikuchi, R., Suzuki, K., Miura, H.: Change of the effective strength of grain boundaries in Alloy 617 under creep-fatigue loadings at 800 ℃. In: Proceedings on ASME2015 Int. Mechanical Engineering Congress and Exposition, (IMECE2015), Salt Lake City, UT, USA, no. 11210, 6 p (2019) Suzuki, W., Ishihara, K., Kikuchi, R., Suzuki, K., Miura, H.: Change of the effective strength of grain boundaries in Alloy 617 under creep-fatigue loadings at 800 ℃. In: Proceedings on ASME2015 Int. Mechanical Engineering Congress and Exposition, (IMECE2015), Salt Lake City, UT, USA, no. 11210, 6 p (2019)
Metadata
Title
Initial Intergranular Cracking of Ni-Base Superalloys Due to the Degradation of the Crystallinity of Grain Boundaries Under Creep-Fatigue Loading
Authors
Wataru Suzuki
Yifan Luo
Kenta Ishihara
Kens Suzuki
Hideo Miura
Copyright Year
2020
DOI
https://doi.org/10.1007/978-3-030-47883-4_58

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