|About this Abstract
||3rd World Congress on High Entropy Alloys (HEA 2023)
||Assessing Additive Manufacturing Processability of Novel Refractory High Entropy Alloys Prior to Powder Manufacture
||Lucy Farquhar, Lova Chechik, Alex Goodall, Abdallah Reza, Felix Hofmann, Iain Todd, Russell Goodall
|On-Site Speaker (Planned)
Many high entropy alloys (HEAs) have been manufactured by additive manufacturing (AM), resulting in components with excellent build quality. However, AM processes require controlled feedstock materials, and screening HEAs for AM processability is time consuming and costly. For refractory HEAs especially, bespoke powders can also be difficult to manufacture with huge associated costs and lead times. This work presents an alloy processability assessment for the laser powder bed fusion (LPBF) process, to be used prior to welding trials or expensive powder manufacture. CALPHAD analysis is used along with Rosenthal based simulations to predict the alloy susceptibility to solidification and solid state cracking. These results are then compared with experimental weld tracks and LPBF of CoCrFeNi-based HEAs and with the cracking behaviour of some commonly processed commercial alloys. The method is then used to predict AM processability of some novel refractory HEAs, one of which is then successfully manufactured by LPBF.
||Planned: Metallurgical and Materials Transactions