|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||Potential Contributors to Creep Resistance in DMLS Processed IN718 Revealed through Modeling of Creep Test Data
||Blake Rogers, Amaneh Tasooji
|On-Site Speaker (Planned)
Creep tests were conducted on IN718 materials processed by (i) Direst Metal Laser Sintering (DMLS) method of Additive Manufacturing (AM), and (ii) conventional forging methods. Analysis and modeling of steady-state creep rate data exposed active creep deformation mechanisms across the stress and temperature regimes of interest and revealed improved high temperature performance for DMLS material. Transition temperatures (TT) associated with changes in active creep mechanisms along the ranges of stress were identified. The data revealed a positive shift in the TT for DMLS material, indicative of delayed activation of low-stress creep mechanisms. The observed behavior along with microstructural analysis illuminates potential factors responsible for the improved creep behavior in DMLS processed IN718. Limited TEM and SEM analysis revealed sub-micron grain boundary oxides in DMLS material. Grain boundary pinning by such oxides is believed to be responsible for the TT shift and improved creep resistance in DMLS materials.
||Planned: Supplemental Proceedings volume