|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Integrative Materials Design III: Performance and Sustainability
||In-situ Inspection of Laser-based Directed Energy Deposition Processes Using Laser Ultrasonics
||Marissa Brennan, Todd A. Palmer, Maxwell Wiedmann, Marvin Klein
|On-Site Speaker (Planned)
Lack of fusions defects (LOFDs) have tendencies to form in directed energy deposited (DED) builds upon incorrect selection of hatch spacing, disruptions in powder flow, and changes to molten pool shape. Part qualification must take place following entire component fabrication in means to locate and repair LOFDs using post-processing (HIP), otherwise components must be scrapped. Reduction of post-processing steps and improved production confidence levels emphasize current (AM) demands. Laser-ultrasonics, an in-line, non-destructive inspection (NDI) technique displayed capability of operating in close proximity to the DED head. LOFDs produced by varying hatch spacing and powder flow replicated realistic defects formed during processing. Ranges of titanium, nickel, and precipitation hardened (PH) grade stainless steel alloys provides evidence indicating opportune ultrasonic advancements in detecting defect formation in recently deposited layers that can be resolved by operators prior to entire component fabrication, reducing post-processing repairs. Additional signal information demonstrates feasible monitoring of microstructural evolution.
||Planned: Supplemental Proceedings volume