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Influence of microstructure degradation induced by pretreatment on the creep behavior in Ni-based single-crystal superalloy with different orientations

Published online by Cambridge University Press:  26 February 2020

Wenyan Gan
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Hangshan Gao
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Yanchao Zhao
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Zhixun Wen*
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China; and Shaanxi Key Laboratory of Structure Strength and Reliability for Aeroengine, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Guangxian Lu
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Bo Jiang
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Zhufeng Yue
Affiliation:
School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China; and Shaanxi Key Laboratory of Structure Strength and Reliability for Aeroengine, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
*
a)Address all correspondence to this author. e-mail: zxwen@nwpu.edu.cn
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Abstract

The effects of stress-free and stress-assisted pretreatments at a relatively high temperature on the creep properties of [001] and [011] oriented Ni-based single-crystal superalloys are investigated in this article. The results show that the creep life of the pretreated samples is shorter than that of the original samples. The variation of the γ/γ′ morphology during the creep process is characterized by the microstructure period. Based on the interaction between the dislocations in the γ matrix channel and the γ′ phase, the difference in creep properties of the two oriented alloys after pretreatment is analyzed. Combined with the crystal plasticity theory and the number of activated slip systems observed in the experiments, it can be concluded that the two oriented alloys after pretreatment show obvious creep anisotropy and that the creep life increases with the number of activated slip system.

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Article
Copyright
Copyright © Materials Research Society 2020

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