ICAMS / Interdisciplinary Centre for Advanced Materials Simulation
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γ' hardened cobalt-base superalloys

Date: 13.02.2013
Time: 10:00 a.m.
Place: seminar room 0.08

Steffen Neumeier, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
Alexander Bauer, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
Mathias Göken, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
Christopher Zenk, Department of Materials Science and Engineering, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

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 [1]. 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. Additionally, it will be shown how systematic alloy development can lead to competitive alloys with well-balanced properties.

[1] Sato et al., Cobalt-Base High-Temperature Alloys, Science 312 (2006) 90-91

Supporting information:

Special_Neumeier_13_02_13.pdf
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