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Gamma prime stability and its influence on tensile behavior of a wrought superalloy with different Fe contents

Published online by Cambridge University Press:  12 April 2016

Chang Shuai Wang ,
Yong An Guo ,
Jian Ting Guo  and
Lan Zhang Zhou
Chang Shuai Wang*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Yong An Guo
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Jian Ting Guo
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Lan Zhang Zhou*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
b)e-mail: cswang@imr.ac.cn
a)Address all correspondence to these authors. e-mail: lzz@imr.ac.cn
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Abstract

Gamma prime (γ′) stability and its influence on tensile behavior of a newly developed wrought superalloy with various Fe contents was studied both experimentally and thermodynamically. The results show that the γ′-solvus temperature is higher and γ–γ′ lattice mismatch is bigger in the alloy with the lower Fe content. During long-term thermal exposure at 650–750 °C, the coarsening behavior of γ′ precipitates follows Ostwald ripening kinetics and the lower Fe content can decrease the coarsening rate of γ′ precipitates due to the increase of the activation energy for γ′ coarsening. Moreover, the lower Fe content can retard the transformation from γ′ to η phase. The tensile properties of the alloys with different Fe contents are almost same after standard heat treatment. However, after thermal exposure, the decrease of tensile strength in the alloy with lower Fe content is less than that of the alloys with higher Fe content due to the improvement of γ′ stability.

Keywords

wrought superalloyγ′ coarseningtransformation from γ′ to ηtensile behaviorFe content700 °C A-USC
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1361 - 1371
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Copyright
Copyright © Materials Research Society 2016 

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