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The effect of the rafted y’ precipitates on the creep resistance of the conventionally cast superalloy IN-100 was investigated at the creep conditions of 900 “C/276 MPa. The creep rate was observed to be minimum when the rafted y’ size aspect ratio a/b was close to - 1 or - 2, where a and b are the rafted y’ particle sizes perpendicular and parallel to the applied tensile stress axis, respectively, whereas the creep rupture life showed the highest value when the initial-to-rafted y’ volume fraction ratio and the initial to rafted y’ size ratio were minimum. In addition, it was also observed that the ratio of the initial-to-rafted y’ particle surface area per unit volume controls the creep rate in the secondary and tertiary stages. It was predicted that the creep deformation mechanism changes from the Orowan bowing in the secondary stage to the particle shearing in the final stage.

Relationship Between Rafted &#947;' Morphology and Creep Resistance of a Nickel-Based Superalloy

Relationship Between Rafted γ' Morphology and Creep Resistance of a Nickel-Based Superalloy