|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials for High Temperature Applications: Next Generation Superalloys and Beyond
||Benchmarking Multi-scale Models with Microtensile Experiments and 3D Microstructural Characterization of René 88DT
||David Eastman, Paul Shade, Michael Uchic, George Weber, Somnath Ghosh, Will Lenthe, Tresa Pollock, Kevin Hemker
|On-Site Speaker (Planned)
Microstructure-dependent ICME-based deformation models require structural characterization and constitutive properties, in addition to experimentally obtained benchmarks at salient length scales. Traditional methods for calibrating and validating mechanical response models with bulk experiments miss many of the underlying microstructural details. Techniques for machining micro-scale samples, such as high-throughput laser ablation, and corresponding microtensile tests have been developed and are being used to elucidate the underlying microstructure-property relations for polycrystalline René 88DT. These experiments allow for meso-scale characterization through collection of critical data, such as grain size, grain orientation and local strain accumulation, for a microstructural volume that is tractable in crystal plasticity modeling. 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. Experimentally capturing these explicit microstructures and their attendant mechanical behavior provides quantitative metrics for crystal plasticity model development and validation.