|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Fatigue in Materials: Fundamentals, Multiscale Modeling and Prevention
||Low Cycle Fatigue Behavior of Direct Metal Laser Sintered Inconel Alloy 718: Experiments and Crystal Plasticity Modeling
||Marko Knezevic, Saeede Ghorbanpour
|On-Site Speaker (Planned)
We investigate strength and low cycle fatigue (LCF) of direct metal laser sintered (DMLS) Inconel 718 superalloy as a function of different initial microstructure created by variation in the deposited direction. To further investigate effects of initial microstructure and condition of the material, a set of samples underwent hot isostatic pressing. To have a reference for the LCF behavior of DMLS Inconel 718, a set of wrought Inconel 718 samples in the same condition was also tested, and the results critically compared against the results for the DMLS materials. In order to understand particularities pertaining to LCF behavior of the material at the grain-scale, a dislocation density based hardening law is developed and used within elasto-plastic self-consistent crystal plasticity model to simulate LCF. The results reveal the significant role played by porosity, annealing twins as well as reverse dislocation motion and backstresses on the LCF life of the material.
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