About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Environmental Degradation of Additively Manufactured Alloys
|
Presentation Title |
High Temperature Oxidation and Phase Transformations in γ-TiAl Produced by Additive Manufacturing |
Author(s) |
Radoslaw Piotr Swadzba |
On-Site Speaker (Planned) |
Radoslaw Piotr Swadzba |
Abstract Scope |
γ-TiAl intermetallics have recently been successfully applied on low pressure turbine blades of modern aircraft engines due to their low density, high specific strength and creep resistance, all of which make them excellent alternatives for Ni-based superalloys. In this paper the results of investigations are presented concerning the oxidation behavior, microstructure evolution and phase transformations that occur within a 48-2-2 γ-TiAl alloy produced by EBM. Analytical tools such as EBSD as well as quantitative XRD were employed to study the phase transformations taking place during long-term high temperature exposure up to 3000 hours at 750 and 850 °C in 500 hour intervals. The oxidation behavior of the alloy was studied under cyclic and isothermal oxidation conditions at 750 and 850 °C up to 3000h. Special effort has been done in order to perform a detailed investigation of the growth of protective oxide scales using high resolution STEM, EFTEM and EELS. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |