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Influence of thermal exposure on the creep properties of an aluminized Ni-based single crystal superalloy in different surface orientations
Highlights Aluminizing treatment decreased the creep strength of superalloy. Long-term exposure deteriorated the creep strength of coated superalloy. Surface orientation affected the creep lifetime of coated superalloy. Fracture deformation mechanism in coated superalloy was discussed.
Abstract The effect of thermal exposure on the creep properties of an aluminized Ni-based single crystal superalloy in different surface orientations has been studied in the present study. The specimens were coated by a pack aluminizing process conducted at 1000°C for 5h under an argon atmosphere. Long-term exposure was performed at 1100°C for 500h prior to the creep test. The creep properties were found to deteriorate after the long-term exposure as a result of the coarsening of γ′ precipitates accompanied by the formation of a secondary reaction zone which is known to degrade the strength of aluminide coating on a Ni-based single crystal superalloy. The formation of a topologically close-packed phase is one of the degradation factors that are responsible for the reduction of the creep strength of the aluminide coating on a Ni-base single crystal superalloy both with and without long-term exposure. The anisotropic creep properties between the two side-surfaces are due to the different arrangements of slip systems.
Influence of thermal exposure on the creep properties of an aluminized Ni-based single crystal superalloy in different surface orientations
Highlights Aluminizing treatment decreased the creep strength of superalloy. Long-term exposure deteriorated the creep strength of coated superalloy. Surface orientation affected the creep lifetime of coated superalloy. Fracture deformation mechanism in coated superalloy was discussed.
Abstract The effect of thermal exposure on the creep properties of an aluminized Ni-based single crystal superalloy in different surface orientations has been studied in the present study. The specimens were coated by a pack aluminizing process conducted at 1000°C for 5h under an argon atmosphere. Long-term exposure was performed at 1100°C for 500h prior to the creep test. The creep properties were found to deteriorate after the long-term exposure as a result of the coarsening of γ′ precipitates accompanied by the formation of a secondary reaction zone which is known to degrade the strength of aluminide coating on a Ni-based single crystal superalloy. The formation of a topologically close-packed phase is one of the degradation factors that are responsible for the reduction of the creep strength of the aluminide coating on a Ni-base single crystal superalloy both with and without long-term exposure. The anisotropic creep properties between the two side-surfaces are due to the different arrangements of slip systems.
Influence of thermal exposure on the creep properties of an aluminized Ni-based single crystal superalloy in different surface orientations
Latief, F.H. (author) / Kakehi, K. (author)
2013-11-28
6 pages
Article (Journal)
Electronic Resource
English
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