About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials Research in Reduced Gravity
|
Presentation Title |
Effect of Inert Gas Atmosphere on Evaporation Losses and Density Measurement for Electromagnetically Levitated Superalloys |
Author(s) |
Jannatun Nawer, Stéphane Gossé, Michael P SanSoucie, Douglas Matson |
On-Site Speaker (Planned) |
Jannatun Nawer |
Abstract Scope |
Mass evaporation changes the composition of alloys during melting and annealing affecting their final product performance. The use of inert gas significantly reduces the evaporation, so a mathematical model based on Langmuir’s equation was developed to track mass loss of each species in the alloy composition during the measurement of thermo-physical properties in ISS-EML. Two Ni-based super alloys, CMSX-10 and LEK-94 were investigated to predict the dynamic mass loss and track the potential for composition shifts throughout each thermal cycle. Conducting experiments in an inert shielding-gas environment virtually eliminates composition shifts (less than 1%) due to differential relative evaporation and the composition is maintained within the desired limits. Knowledge of the activities of the various species of these alloys as a function of temperature increases the accuracy of density measurements because dynamic mass is now known. |
Proceedings Inclusion? |
Planned: Publication Outside of TMS |