About this Abstract |
Meeting |
2021 TMS Annual Meeting & Exhibition
|
Symposium
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Materials for High Temperature Applications: Next Generation Superalloys and Beyond
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Presentation Title |
Oxidation of TiAl Alloys GE 4822 and TNM-B1 between 600°C and 900°C and Impact on Mechanical Properties |
Author(s) |
Mathias C. Galetz, Lukas Mengis, Anke Silvia Ulrich |
On-Site Speaker (Planned) |
Mathias C. Galetz |
Abstract Scope |
Light weight material titanium aluminides (TiAl) can substitute Ni-alloys in several parts of today´s aero engines. Their maximal service temperature is usually given in the range of 700-750 °C, because among others above their oxidation resistance becomes insufficient. Many studies have investigated the oxidation behavior of TiAl at very high temperatures, and thus well above the actual service temperature. A comparative study on the isothermal oxidation behavior of the two β–containing titanium aluminide alloys GE 4822 and TNM-B1 in the HIPed condition was carried out between 600°C and 900°C for up to 1000 h in air. Both suffer from an undesirable embrittlement due to oxidation and phase transformations in the subsurface Zone, that have a strong impact on the mechanical properties at room temperature. An approach is presented to describe phenomena that are linked to the oxidation induced embrittlement in due consideration of the already existing theories in literature. |
Proceedings Inclusion? |
Planned: |