| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Refractory Metallic Materials
|
| Presentation Title |
Thermomechanical Model Based Approach to Mitigate Crack Susceptibility in Additive Manufactured Refractory Material. |
| Author(s) |
Rohit Sitaram Randhavan, Shashank Sharma, Narendra Dahotre |
| On-Site Speaker (Planned) |
Rohit Sitaram Randhavan |
| Abstract Scope |
The primary challenge in laser-based additive manufacturing (AM) of tungsten is to achieve higher without solid-state cracking. Strategies to mitigate defects, such as pre-heating the substrate and alloying pure tungsten, have shown considerable success. However, there is still a lack of fundamental understanding of the physical phenomena involved. The present study adopts a CALPHAD informed 3D FE-based thermomechanical computational model to provide a physics-based understanding of crack evolution in AM of tungsten and its alloys. The role of thermal gradient, cooling rate, strain rate, and state of stress in the heat-affected zone in possible cracking mechanisms were elucidated with the help of the developed model. The results from the thermomechanical model were integrated with Scheil-based calculation using CALPHAD to study the effect of compositional change on crack susceptibility of tungsten-based alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Solidification, Modeling and Simulation |