Effect of Vacuum Environment on Creep Rupture Properties of Inconel 617 at 1000℃ : Especially, Based on Crack Initiation and the Propagation

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The effect of vacuum environment on the creep rupture properties of Inconel 617 was investigated at 1000℃. (1) Creep rupture time of unnotched and notched specimens in 0.3 torr was shorter than that in air in the range of stresses from 3.5 Kgf/mm^<2> to 6.0 Kgf/mm^<2> and the grain sizes from ASTM Nos.2 to 4 tested. (2) This effect resulted from both early initiation and fast propagation of the creep crack in 0.3 torr. (3) It was estimated that both the early crack initiation and the fast propagation in 0.3 torr resulted from an increase of local creep rate at both the notch root of the specimen and the crack tip. (4) It was supposed that the increase of local creep rate in 0.3 torr resulted from the decarburization of the specimen through the non-protective oxide layer which was produced by lack of oxygen it the vacuum.
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