|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Fatigue and Fracture III
||Evolution of Defect Characteristics During In Situ Tensile Loading of a Laser Powder Bed Fusion Processed 316L Stainless Steel Alloy: A Synchrotron X-ray Tomography Study
||Hahn Choo, Kin-Ling Sham, Xianghui Xiao, Derek Morin, Elena Garlea
|On-Site Speaker (Planned)
Using in-situ high-energy synchrotron x-ray microtomography, the evolution of defect characteristics during tensile deformation of a laser powder bed fusion (LPBF) processed 316L stainless steel alloy was investigated. Specimens with two different types of defects, namely a near-optimal density case with spherical pores and a porous case with lack-of-fusion defects, were studied. First, the defects in as-printed specimens are characterized by quantitative image analysis of microtomography data for size, shape, orientation, and density. Then, changes in such defect characteristics in the elastic, plastic, and fracture regimes during uniaxial tensile deformation were studied. The effect of built-in defects on macroscopic tensile behavior, subsequent changes in the defect characteristics during deformation/fracture, and the interaction between the built-in defects and the damage propagation during tensile fracture will be discussed. This work was performed under the auspices of the U.S. Department of Energy by Consolidated Nuclear Security, LLC (CNS) under Contract DE-NA-0001942.
||Planned: Supplemental Proceedings volume