Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574697 | Materials Science and Engineering: A | 2014 | 6 Pages |
Abstract
A new Ni-Fe base superalloy for applications of advanced ultra-supercritical (A-USC) boiler tubes was heat treated to three different statuses, i.e. aging treatment, aging treatment plus 1000 h and 7000 h thermal exposure at 700 °C. The specimens with various heat treatments have been compressed at 700 °C. The yield strength first increased with thermal exposure time and decreased after further thermal exposure. After aging treatment and 1000 h thermal exposure, deformation was heterogeneous, and dislocation slip combing climb was dominant process. However, after 7000 h thermal exposure, deformation became homogeneous. Stacking faults shearing the γⲠprecipitates were also observed. The coarsening of γⲠprecipitates and α-Cr precipitation occurred during long term thermal exposure. The influence of microstructural evolution on the yield strength and deformation mechanisms is discussed.
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Authors
Y. Yuan, Z.H. Zhong, Z.S. Yu, H.F. Yin, Y.Y. Dang, X.B. Zhao, Z. Yang, J.T. Lu, J.B. Yan, Y. Gu,