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Effect of Co on microstructural stability of the third generation Ni-based single crystal superalloys

Published online by Cambridge University Press:  28 March 2016

Bo Wang ,
Jun Zhang ,
Taiwen Huang ,
Wenchao Yang Open the ORCID record for Wenchao Yang [Opens in a new window] ,
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
Wenchao Yang
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 effect of Co on element segregation and microstructure is investigated in the third generation Ni-based single crystal superalloys with 4, 8.5, and 11.5 wt% Co addition. The results show that the increase of Co content leads to a severe element segregation in as-cast microstructure. After heat treatment, the size of γ′ phase is slightly reduced with Co content increase. During the thermal exposure, the γ′ phase coarsens gradually but its coarsening rate decreases with increasing Co content. In addition, some acicular and blocky topologically close-packed (TCP) phases are precipitated in 4% Co and 8.5% Co alloys. However, no TCP phase can be found in 11.5% Co alloy. Finally, it may be concluded that although a higher Co content is harmful for the element segregation, it is beneficial to maintain the cuboidal morphology of γ′ phase, decrease its coarsening rate, and impede the precipitation of TCP phase.

Keywords

ComicrostructureNi

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Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1328 - 1337
Copyright
Copyright © Materials Research Society 2016 

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