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Investigation on precipitation phenomena and mechanical properties of Ni–25Cr–20Co alloys aged at high temperature

Published online by Cambridge University Press:  25 September 2018

Limin Wei ,
Shuo Wang ,
Quan Yang ,
Yi Cheng  and
Shuping Tan
Limin Wei*
Affiliation:
Material Research Institute of Harbin Boiler Co., Ltd., Harbin 150046, China; and State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin 150046, China
Shuo Wang
Affiliation:
Material Research Institute of Harbin Boiler Co., Ltd., Harbin 150046, China; and State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin 150046, China
Quan Yang
Affiliation:
Material Research Institute of Harbin Boiler Co., Ltd., Harbin 150046, China; and State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin 150046, China
Yi Cheng
Affiliation:
Material Research Institute of Harbin Boiler Co., Ltd., Harbin 150046, China; and State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin 150046, China
Shuping Tan
Affiliation:
Material Research Institute of Harbin Boiler Co., Ltd., Harbin 150046, China; and State Key Laboratory of Efficient and Clean Coal-fired Utility Boilers, Harbin 150046, China
*
a)Address all correspondence to this author. e-mail: beyond4650@163.com
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Abstract

The evolution of carbides and the coarsening behavior of L12 ordered γ′ phase in Ni–25Cr–20Co alloys aged for varying time from 1000 to 5000 h at 700 and 750 °C were discussed in this paper. The mechanical properties of the alloys after aging were also discussed. Due to the changing of predominated resistance factor, a few of the γ′ precipitates’ shape changed from spherical to cuboidal after aging at 750 °C for 3000 h. The sizes and volume fraction of the γ′ precipitates were measured after aging at both temperatures. The experimentally determined temporal exponent of the γ′ coarsening indicated that the coarsening kinetics is in accordance with both models: the classical matrix diffusion LSW model and the trans-interface diffusion-controlled model. Additionally, the coarsening rate of the γ′ precipitates is dominated by the diffusion coefficients of Nb based on the classical LSW model. Furthermore, the yield strength curves of the alloys aged at 700 °C showed different trends at both test temperatures which is related to the influence of γ′ coarsening on the critical resolved shear stress.

Keywords

Ni–25Cr–20Co alloyγ′ precipitates morphologycoarsening kineticsmechanical propertiescritical resolved shear stress
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 20 , 29 October 2018 , pp. 3479 - 3489
Copyright
Copyright © Materials Research Society 2018 

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References

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