|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||Microstructure Evolution, Fatigue Crack Growth Mechanisms, and Effects of Heat Treatment and HIP in Ti-6Al-4V Alloys Fabricated by Electron Beam Melting
||Robert Warren, Haize Galarraga, Diana Lados, Ryan Dehoff, Michael Kirka
|On-Site Speaker (Planned)
Electron Beam Melting (EBM) is an Additive Manufacturing process that selectively fuses powder-bed particles using an electron beam as the power source. EBM can produce unique microstructures and mechanical properties which are related to the processes specific thermal history. In this study, Ti-6Al-4V alloys fabricated by EBM have been systematically investigated. The microstructures, tensile, and long and small fatigue crack growth (FCG) properties have been evaluated and compared in different orientations relative to the deposition direction. The effects of various heat treatments, Hot Isostatic Pressing (HIP), initial crack size, and stress ratio on the FCG mechanisms at the microstructural scale of the materials has been determined, and will be discussed from structural design perspective. Original analytical methods for FCG threshold correlations and computational modeling work for predicting temperature evolution during processing and microstructure development will also be presented and discussed for properties optimization and rapid qualification.
||Planned: Supplemental Proceedings volume