Regensburg 2013 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 37: Mechanical Properties I

MM 37.1: Vortrag

Mittwoch, 13. März 2013, 11:45–12:00, H26

γ' Hardened Cobalt-Base Superalloys - A New Class of High Temperature Materials — •Steffen Neumeier, Christopher Zenk, Alexander Bauer, and Mathias Göken — Lehrstuhl Allgemeine Werkstoffeigenschaften, Department Werkstoffwissenschaften, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Deutschland

Conventional Co-based alloys are suitable materials for use in corrosive environments at high temperatures. However, the classic Co-based alloys with high Chromium contents cannot compete with γ' (Ni3Al) hardened Ni-base superalloys in terms of strength as they are only carbide and solid solution hardened. Accordingly, these alloys are only used as materials for static parts in gas turbines for energy conversion, for example. However, this situation could change in the future due to the discovery of the ternary compound Co3(Al,W) in 2006. This stable intermetallic phase with L12 crystal structure is in equilibrium with the face centered cubic Co solid solution and therefore γ/γ' Co-base superalloys with microstructures similar to Ni-base superalloys can be generated. This new class of high temperature materials shows promising properties but is still in its early stages of development. In this talk the positive aspects of Co as base material will be discussed and the microstructures as well as the thermo-physical, mechanical and oxidation properties of these new γ/γ' Co-base superalloys will be presented and compared with Ni-base superalloys.