Discontinuous Precipitation and Phase Stability In Re- and Ru-Containing Nickel-Base Superalloys

被引：30
|
作者：
Heckl, Astrid [1 ]
Cenanovic, Samir [2 ]
Goeken, Mathias [2 ]
Singer, Robert F. [1 ]
机构：
[1] Univ Erlangen Nurnberg, Dept Mat Sci & Engn, Inst Sci & Technol Met, D-91058 Erlangen, Germany
[2] Univ Erlangen Nurnberg, Inst Gen Mat Properties, Dept Mat Sci & Engn, D-91058 Erlangen, Germany
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2012年 / 43A卷 / 01期
关键词：
CELLULAR PRECIPITATION;
D O I：
10.1007/s11661-011-0833-6
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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.
引用
收藏
页码：10 / 19
页数：10
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