|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Fatigue and Fracture III
||The Role of As-printed Defects and Microstructural Heterogeneities in EBM-PBF Ti-6Al-4V: Tensile Testing and Characterization at Appropriate Length Scales
||Nik Hrabe, Jake Benzing, Li-Anne Liew, Ryan M. White, Frank W DelRio
|On-Site Speaker (Planned)
Inherently, additively manufactured (AM) processes produce defects, anisotropy and heterogeneities in the microstructure of metal parts. In the current work on Ti-6Al-4V (manufactured using electron beam melting powder bed fusion), mini-tensile specimens are used to measure the influence of build orientation (horizontal vs. vertical) and heat treatment (as-built vs. hot isostatic pressing) on tensile properties. The role of defect content, grain size and texture will be discussed. Building on this work, meso-scale tensile specimens with gauge dimensions on the order of a few hundred microns were extracted from as-built parts. Meso-scale testing enables tracking of specific microstructural features that form along prior-â grain boundaries and sub-surface defects (pores and lack-of-fusion zones) throughout the entire gauge length, before and after deformation. The coupling of non-destructive characterization techniques with meso-scale mechanical testing is necessary to evaluate the role of as-printed defects and microstructural heterogeneities at an appropriate length scale.
||Planned: Supplemental Proceedings volume