Thermomechanical fatigue behavior of the third-generation,single-crystal superalloy TMS-75: Deformation structure |
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Authors: | Zhou H Ro Y Koizumi Y Kobayashi T Harada H Okada I |
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Affiliation: | (1) the National Institute for Materials Science, Tsukuba-shi, 305-0047 Ibaraki, Japan;(2) Mitsubishi Heavy Industries, Ltd., 676-8686 Takasago, Hyogo, Japan |
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Abstract: | The deformation structure after the out-of-phase thermomechanical fatigue (OP TMF) of the single-crystal (SC), Ni-based superalloy
TMS-75 has been studied. Mechanical experiments were performed at temperatures between 400 °C and 900 °C under different total
strain ranges with varying hold times in the compression stage. The lives of TMF for samples with hold times of 10 and 60
minutes dropped drastically by one order of magnitude as compared with those without it. Different structures developed during
TMF were correlated to the difference in mechanical behavior for the two cases. The dislocations in the γ phase and the stacking faults (SFs) in the γ′ phase were quantitatively analyzed by transmission electron microscopy (TEM). This work verified that shearing of the γ′ precipitates occurred with a single-dislocation mechanism rather than a dislocation-reaction mechanism. The implications
of this work on the design of superalloys are presented. |
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