Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574335 | Materials Science and Engineering: A | 2015 | 7 Pages |
Abstract
Addition of Re in nickel-based superalloys results in an increase of the creep life. However, Re is also known to segregate to the dendrite core and to promote the formation of topologically closed packed (TCP) phases. In the present work, the local segregation of Re was studied in the heat treated and creep deformed state of a nickel-based superalloy. Tensile creep deformation at 1050 °C resulted in the formation of TCP phases in the dendritic regions. Characterization using TEM confirmed the presence of μ phase that grows on {111} planes. Measurements with a nanoindenting AFM show that the μ phase is harder and shows less work hardening than both the γ and the γⲠphases. Furthermore, in the creep deformed state the hardness of the matrix phase is very similar in the dendrite core and in interdendritic areas, although Re is still enriched in the dendrite core. It is shown that Re is consumed in the dendrite core by the TCP phases.
Related Topics
Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Hamad ur Rehman, Karsten Durst, Steffen Neumeier, Alireza B. Parsa, Aleksander Kostka, Gunther Eggeler, Mathias Göken,