Creep Behaviors of a Single Crystal Nickel-Based Superalloy Containing 4.2%Re

Su Gui Tian; Ben Jiang Qian; Fu Shun Liang; An An Li; Xing Fu Yu

doi:10.4028/www.scientific.net/MSF.689.276

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HomeMaterials Science ForumMaterials Science Forum Vol. 689Creep Behaviors of a Single Crystal Nickel-Based...

Creep Behaviors of a Single Crystal Nickel-Based Superalloy Containing 4.2%Re

Abstract:

By the measurement of creep curves and microstructure observation, an investigation has been made into the creep behaviors and microstructure evolution of a single crystal nickel-based superalloy containing 4.2%Re. Results show that the superalloy displays an obvious sensibility on the applied temperatures and stresses in the range of the applied temperatures and stresses. During the initial creep, the cubical g¢ phase in the alloy is transformed into an N-type rafted structure along the direction vertical to the applied stress axis. After crept up to fracture, the rafted g¢ phase in the region near fracture is transformed into a twisted configuration. The dislocation climbing over the rafted g¢ phase is considered to be the main deformation mechanism of the alloy during the steady creep state, and dislocations shear into the rafted g¢ phase is the main deformation mechanism of the alloy in the later stage of creep.

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Periodical:

Materials Science Forum (Volume 689)

Pages:

276-281

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.689.276

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Online since:

June 2011

Authors:

Su Gui Tian, Ben Jiang Qian, Fu Shun Liang, An An Li, Xing Fu Yu

Keywords:

Creep Behaviour, Deformation Feature, Micro-Structure Evolution, Rhenium, Single Crystal Nickel-Based Superalloy

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