|About this Abstract
||2019 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Fatigue and Fracture III
||Role of Multi-scale Microstructural Features in Tensile, Compressive, Fatigue, and Fracture Behavior of Direct Metal Laser Sintered Inconel-718
||Nicholas Ferreri, Saeede Ghorbanpour, Jonathan Bicknell, Sven Vogel, Marko Knezevic
|On-Site Speaker (Planned)
A comprehensive investigation into the role of initial microstructure on strength and fatigue behavior was performed on direct metal laser sintered (DMLS) Inconel-718 superalloy. Results are reported for different initial microstructures created by variation in sample orientation with respect to the build direction during processing. A set of samples underwent hot isostatic pressing, and wrought Inconel 718 samples were also tested as a reference to compare against the DMLS materials. Microstructural characterization provided information on grain structure, porosity and annealing twins as well as volume fractions and morphologies of secondary intermetallic phases, which were correlated with mechanical behavior. Furthermore, to better understand the deformation mechanics of the material, a dislocation density based hardening law was developed and used within elasto-plastic self-consistent crystal plasticity model to simulate all tests except high cyclic fatigue. The modeling, in conjunction with the detailed characterization, reveals the role of microstructural features on the material behavior.
||Planned: Supplemental Proceedings volume