|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Qualification of Wire + Arc Additive Manufacture: Challenges and Outlook
||Paul A Colegrove, Stewart Williams, Filomeno Martina
|On-Site Speaker (Planned)
For over 10 years Cranfield University has pioneered the Wire + Arc Additive Manufacture process for producing complex, meter-sized components with the potential to significantly reduce cost and lead times. Qualification is essential but extremely challenging, and methods for processes like welding are difficult to implement because the thermal cycle, which is the main determinant of the material properties, is highly variable. This is because it is affected by factors like the deposition strategy, and the part geometry which determine the ability to extract heat. For titanium an intermediate cooling rate provides the optimum balance between strength and ductility. For this reason, a number of techniques for thermal cycle quantification are being explored including melt pool size assessment, pyrometry and thermography. Finally techniques are being developed for monitoring the oxygen level – which affects ductility in titanium, grain structure and defects through on and off-line NDT methods.
||Planned: Supplemental Proceedings volume