About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
General Poster Session
|
Presentation Title |
C-18: The Role of Composition and Microstructure on the Cyclic Oxidation Kinetics of IN738LC, N5 and Rene 80 |
Author(s) |
Mallikarjuna Heggadadevanapura Thammaiah, Norman Richards, William Caley |
On-Site Speaker (Planned) |
Mallikarjuna Heggadadevanapura Thammaiah |
Abstract Scope |
The cyclic oxidation behaviour of IN738LC, Rene 80 and N5 was investigated. The test consisted of 1000 cycles of 1 h exposure in static air at 900°C using a discontinuous thermogravimetric method. The cyclic oxidation resistance of N5 was found to be better than that of IN738LC and Rene 80; also, scale spallation for N5 was minimal compared to the other two alloys. Although both IN738LC and Rene 80 showed scale spallation, the rate was more severe in Rene 80 due to the combined effects of high Ti and formation of volatile Mo-rich oxides. The spallation in N5 was due to the formation of Ta-Hf-oxy carbides, which generate a high shear strain at the matrix-oxide and oxy-carbide interface. A COSP-Monte Carlo simulation was found to provide a reasonable fit for IN738LC, whereas the approach was less applicable in Rene 80 and N5 due to severe and unpredictable spallation respectively. |
Proceedings Inclusion? |
Undecided |