|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Benchmarking Multi-scale Models with Microtensile Experiments and 3D Microstructural Characterization of René 88DT
||David Eastman, Paul Shade, Michael Uchic, George Weber, Akbar Bagri, Somnath Ghosh, Will Lenthe, Tresa Pollock, Kevin Hemker
|On-Site Speaker (Planned)
Microstructure-dependent multi-scale crystal plasticity models require microstructural characterization and constitutive properties for calibration, in addition to experimentally obtained benchmarks at salient length scales. Traditional methods for validating mechanical response models with bulk experiments miss microstructural details. Techniques for machining micro-scale samples and corresponding microtensile tests have been developed and are being used to elucidate microstructure-property relations in polycrystalline René 88DT. These experiments allow for meso-scale characterization through collection of critical data, including grain size, grain orientation and local strain accumulation, for microstructural volumes that are tractable in crystal plasticity modeling. Experimentally capturing explicit microstructures and their attendant mechanical behavior provides quantitative metrics for model development. The effect of sample size has also been studied to determine an appropriate representative volume element for modeling René 88DT. It was found that sample strength decreases with size owing to a finite sampling of grain orientations with a biased distribution of Schmid factor values.
||Planned: Supplemental Proceedings volume