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Influence of W, Re, Cr, and Mo on microstructural stability of the third generation Ni-based single crystal superalloys

Published online by Cambridge University Press:  17 October 2016

Bo Wang ,
Jun Zhang ,
Taiwen Huang ,
Haijun Su ,
Zhuoran Li ,
Lin Liu  and
Hengzhi Fu
Bo Wang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Jun Zhang*
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Taiwen Huang
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Haijun Su
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Zhuoran Li
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Lin Liu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
Hengzhi Fu
Affiliation:
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
*
a) Address all correspondence to this author. e-mail: zhjscott@nwpu.edu.cn
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Abstract

The effects of W, Re, Cr, and Mo on microstructural stability, such as the morphology of γ′ phase and the topologically close-packed (TCP) phase precipitation are systematically investigated in eleven kinds of Ni-based single crystal superalloys containing certain amounts of Co, Al, and Ta. After heat treatment, all the designed alloys show different sizes of γ′ phases with typical cuboidal morphology occupying 75% of the total volume. With increasing Re content, the size of γ′ decreases obviously, while the size of γ′ decreases slightly with increasing Cr and Mo contents. Increasing W does not affect the size of γ′. As a result of thermal exposure at 1000 °C for 1000 h, some acicular, rod-like, and blocky TCP phases are precipitated in most alloys. It is noted that Mo and Re can strongly promote the precipitation of TCP phase, but W has no obvious effect on TCP phase precipitation. In addition, transmission electron microscope analysis indicates that these TCP phases are σ phase, μ phase, and R phase.

Keywords

alloymicrostructureNi

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Type
Articles
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Journal of Materials Research , Volume 31 , Issue 21 , 14 November 2016 , pp. 3381 - 3389
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Copyright
Copyright © Materials Research Society 2016 

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Footnotes

Contributing Editor: Mathias Göken

References

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