Discontinuous Precipitation and Phase Stability In Re- and Ru-Containing Nickel-Base Superalloys |
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| Authors: | Astrid Heckl Samir Cenanovic Mathias G?ken Robert F. Singer |
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| Affiliation: | (1) Institute of Science and Technology of Metals, Department of Materials Science and Engineering, University Erlangen-Nuremberg, Martensstr. 5, D-91058 Erlangen, Germany;(2) Institute General Materials Properties, Department of Materials Science and Engineering, University Erlangen-Nuremberg, Erlangen, Germany |
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| Abstract: | The phase stability of nickel-base superalloys has been investigated using a new in-house-designed alloy series with stepwise
increased additions of Re and Ru at otherwise fixed atomic fractions of alloying elements. Results presented in this study
are focused on the lesser-known topologically closed packed (TCP) formation of columnar colonies or so-called discontinuous
precipitation. A detailed investigation of these colonies allowed for identifying compositional changes during the growth
process and for providing a three-dimensional (3-D) illustration of the TCP phases within these colonies. The results were
used to compare the colony growth process with existing growth models. Furthermore, the influence of Re and Ru on the appearance
of discontinuous precipitation has been investigated by means of colony width and the effect on creep properties. Larson-Miller
plots are given to illustrate the creep strength of directionally solidified samples with and without TCP colonies compared
with single crystalline samples free from TCP colonies. |
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