| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Research in Reduced Gravity
|
| Presentation Title |
Chill-cooling of D2 Tool Steel Under Reduced Gravity Conditions |
| Author(s) |
Jonas Valloton, Thomas Volkmann, Hani Henein |
| On-Site Speaker (Planned) |
Hani Henein |
| Abstract Scope |
An industrial D2 tool steel sample is processed with an electromagnetic levitator under microgravity conditions during a parabolic flight. The levitated sample is cooled and solidified by a Si3N4 chill plate. Deformation of the droplet during solidification and propagation of the growth front are monitored by a high-speed camera while the temperature-time profile at the interface between the metal and the chill plate is measured by a pyrometer. The benefit of microgravity is that electromagnetic stirring of the liquid is reduced. This enhances the impact of solidification shrinkage, thermal contraction and mechanical deformation on liquid flow. The surface of the sample shows a clear columnar to equiaxed transition as well as a strong solidification shrinkage between the primary columnar dendrites. The effect of undercooling and cooling rate on the final microstructure is investigated through SDAS measurements, microhardness, SEM, EDX, EBSD and Neutron Diffraction. |
| Proceedings Inclusion? |
Planned: Publication Outside of TMS |