|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Laser Powder Bed Fusion of Hydride-dehydride Ti-6Al-4V Powders: Effect of Hot Isostatic Pressing on Microstructure and Mechanical Properties
||Mohammadreza Asherloo, Ziheng Wu, Srujana Rao Yarasi, Muktesh Paliwal, Mike Marucci , Joe Capone, Anthony Rollett , Amir Mostafaei
|On-Site Speaker (Planned)
In powder bed additive manufacturing, it is assumed that spherical powder results in a desirable powder flowability and higher powder bed packing density. Here, we demonstrate that the bulk flow energy of hydride-dehydride (HDH) Ti-6Al-4V powder with a particle size of 50-120 μm is 341 mJ, while it is 384 mJ for spherical powder with a particle size of 20-63 μm. Laser powder bed fusion process is used to study process window (laser power-velocity) in which a relative density of > 99.5% is achieved. Selected coupons are post heat-treated via hot isostatic pressing to pinch off remnant pores. Microstructure at the cross-sections is studied by optical and scanning electron microscopies to measure solid volume fraction and study pore morphology. Synchrotron-based dynamic x-ray radiography is used to visualize real-time laser-powder interaction and possible defect formation. Mechanical performance (tensile strength, elongation and fatigue life) of the as-built and heat-treated parts are evaluated.