|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Integrative Materials Design III: Performance and Sustainability
||Design of Fatigue Resistant Ni-base Superalloys via Meso-scale Engineering
||Sammy Tin, Martin Detrois, Mike Sangid, John Rotella
|On-Site Speaker (Planned)
In recent years, microstructure explicit fatigue models for polycrystalline Ni-base superalloys have been developed that confirm strain localization around microstructural features, primarily at twin boundaries, prior to nucleation of fatigue cracks. With this improved understanding of fatigue crack nucleation mechanisms, an ICME framework was used to identify the optimized microstructures in a commercial Ni-based superalloy, RR1000. A finite element based crystal plasticity model was used to inform the design of microstructures and identify desirable meso-scale grain boundary character distributions that could be varied to enhance the fatigue performance of RR1000. Following which, innovative hot deformation based grain boundary engineering techniques were used to systematically vary the grain boundary character distributions in small-scale forgings of RR1000. Small-scale forging trials of RR1000 were conducted to produce controlled microstructures with varying grain boundary character distributions. Experimental results will be presented and the implications for design and life prediction assessment will be discussed.
||Planned: Supplemental Proceedings volume