|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Characterization of Additive Manufactured IN718 Using Ultrasonic Measurements
||Paul Panetta, Hualong Du, Waled Hassan
|On-Site Speaker (Planned)
Additive manufactured materials have the potential to make a great impact on manufacturing, but the microstructures of these materials are complex in their morphology, residual stress and texture. We developed ultrasonic measurements to map the 3-D spatial distribution of grain morphology in IN718 nickel superalloy manufactured through direct laser deposition (DLD) process. Ultrasonic measurements were performed by using two focused transducers in the pitch-catch configuration to collect ultrasonic scattering from grain boundaries in various directions. Ultrasonic scattering is significantly sensitive to the mean grain size and grain morphology. The 3-D spatial distribution of grain morphology was measured by comparing the root mean square (RMS) curves of ultrasonic scattered signals captured in various directions. In this work we are able to determine the direction and degree of elongation of dendritic grains. These measurements can be used for qualifying the material and the process as well as provide feedback during fabrication.
||Planned: Supplemental Proceedings volume