Abstract：The effects of precipitates on stress rupture properties of GH907 superalloy was studied in this paper.Special heat treatments were employed to obtain microstructures with ideal strengthening precipitate.It was determined that the single γ' could not provide satisfying rupture properties though excellent tensile strength could be reached;obvious profit could not be observed by the appearance of Laves in the microstructure;however,ε was beneficial to the rupture life of the alloy,specially to eliminating the notch sensitivity.The reason is also explained by means of a model based on the principal facet stress method.
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