About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Real Time Imaging
|
Presentation Title |
In-situ Measurements of Dissolution of TiN in Liquid Cobalt |
Author(s) |
Ming Zhong, Chris Pistorius, Bryan Webler |
On-Site Speaker (Planned) |
Bryan Webler |
Abstract Scope |
The dissolution of cubic carbonitrides in cobalt is a key step in the formation of the cobalt enriched zone (CEZ) during production of cemented carbide tool inserts. A model system of cobalt + TiN was used with confocal scanning laser microscope (CSLM) equipped with a hot stage to study dissolution at 1500°C and 1550°C in argon and nitrogen atmospheres. The dissolution rate of TiN was quantified and the rate-controlling step was hypothesized to be mass transfer of nitrogen in the liquid cobalt. This was tested by using the shrinking core model to calculate the diffusivity of nitrogen based on the measured dissolution rates. The measured diffusivities were found to be consistent with previously reported values. The findings of this work can be utilized in detailed models of CEZ formation during cemented carbide production. |
Proceedings Inclusion? |
Planned: |