Microstructural Evolution during Tensile Creep of a Single-Crystal Nickel-Base Superalloy

Tensile creep tests were conducted at 980°C under a constant stress on a single crystal nickel base superalloy. Some tests were interrupted at different stages during the creep process. The strain-time curves indicated that this alloy exhibited conventional primary, steady-state and tertiary stages...

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Bibliographic Details
Published in:Key engineering materials 2007-09, Vol.353-358, p.511-514
Main Authors: Yang, Xiao Guang, Li, Ying, Yu, Hui Chen, Wu, Xue Ren, Shi, Duo Qi
Format: Article
Language:English
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Summary:Tensile creep tests were conducted at 980°C under a constant stress on a single crystal nickel base superalloy. Some tests were interrupted at different stages during the creep process. The strain-time curves indicated that this alloy exhibited conventional primary, steady-state and tertiary stages at this temperature. The transmission electron microscope (TEM) observations of foils taken from the gauge sections of specimens were made to interpret the microstructural evolution that occurred during the creep process. It was found that the γ′ particles were rafted in the direction perpendicular to the applied stress. The acceleration of the creep rate was related to the change of the dislocation density.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.353-358.511