Characterisation of secondary phases in Ni-base superalloy Rene 65

ABSTRACT

The 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.