|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Gamma (FCC)/Gamma-Prime (L12) Co-Based Superalloys II
||Modeling Precipitate Coarsening in Cobalt-based Superalloys
||Andrea Jokisaari, Shahab Naghavi, Peisheng Wang, Wei Xiong, Kil-Won Moon, Christopher Wolverton, Ursula Kattner, Careyln Campbell, Peter Voorhees, Olle Heinonen
|On-Site Speaker (Planned)
Given the novel nature of γ/γ' cobalt-based superalloys, extensive research is underway to understand their microstructural evolution under service conditions. Advances in numerical frameworks, greater computational resources, and a strong collaboration with other researchers allow us to study precipitate evolution in this novel material system. Here, we present a mesoscale model of γ' precipitate coarsening in cobalt-based superalloys that is informed by atomistic and experimental data. The effect of elastic stiffnesses of the γ and γ' phases, γ/γ' misfit strain, interfacial energy, applied stress, and CALPHAD-based thermodynamic and kinetic information are incorporated to predict microstructural evolution. Three-dimensional simulations were performed to study the effect of temperature, particle size, applied stress, and spatial distribution on precipitate morphology and spacing. This approach should help shorten the development cycle of new γ/γ' cobalt-based superalloys by predicting microstructure evolution before performing time-consuming experimental testing of new compositions.