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

Abstract:

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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:

Edited by:

Enhou Han, Guanghong Lu and Xiaolin Shu

Pages:

276-281

DOI:

10.4028/www.scientific.net/MSF.689.276

Citation:

S. G. Tian et al., "Creep Behaviors of a Single Crystal Nickel-Based Superalloy Containing 4.2%Re", Materials Science Forum, Vol. 689, pp. 276-281, 2011

Online since:

June 2011

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Price:

$35.00

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