Abstract
ABSTRACTThe Ni-base superalloy Rene 65 is a newly introduced cast and wrought alloy, used for turbine disc applications in aero-engines. The fine-grained and γ′-strengthened alloy was developed to increase service temperatures up to over 700°C and therefore, enhance the efficiency of aerospace turbines.In this work, the phases occurring in the as-received material as well as after continuous cooling experiments are characterised by transmission electron microscopy (TEM). In the as-received material, a tri-modal γ′ size distribution is found, ranging from a few nanometres up to approx. 5 µm. In addition, borides are found preferentially at grain boundaries with a size of approx. 1 µm. For different cooling rates, a change in morphology and size distribution of γ′ precipitates is found.This is part of a thematic issue on Nanoscale Materials Characterisation and Modeling by Advances Microscopy Methods - EUROMAT.
Highlights
The main objectives for developing new alloys for aeroengines applications are high strength, long-term stability of the microstructure and corrosion resistance at elevated temperatures and high pressures
The phases occurring in the as-received material as well as after continuous cooling experiments are characterised by transmission electron microscopy (TEM)
In contrast to the powder metallurgical alloys like IN100, Rene 65 is produced by the less cost-intensive triple melting technology which consists of Vacuum Induction Melting (VIM), followed by Electroslag Remelting (ESR) and Vacuum Arc Remelting (VAR) [4]
Summary
The main objectives for developing new alloys for aeroengines applications are high strength, long-term stability of the microstructure and corrosion resistance at elevated temperatures and high pressures. The phases occurring in the as-received material as well as after continuous cooling experiments are characterised by transmission electron microscopy (TEM). Most of them exhibit an fcc γ -matrix with fine dispersed coherent γ precipitates, forming an ordered L12 crystal structure of Ni3(Ti,Al) type, or other Ni3X compounds, like e.g. the γ ”-phase in the Inconel 718 alloy [1].
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