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

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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.

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ACKNOWLEDGMENTS

This work was supported by the National High Technology Research and Development Program of China (863 Program) (No. 2012AA03A501), the National Natural Science Foundation of China (No. 51301171), and the National Energy Administration Program of China (No. NY20150102-1).

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Chang Shuai Wang, Yong An Guo, Jian Ting Guo & Lan Zhang Zhou

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  1. Chang Shuai Wang
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Correspondence to Chang Shuai Wang or Lan Zhang Zhou.

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Wang, C.S., Guo, Y.A., Guo, J.T. et al. Gamma prime stability and its influence on tensile behavior of a wrought superalloy with different Fe contents. Journal of Materials Research 31, 1361–1371 (2016). https://doi.org/10.1557/jmr.2016.139

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