|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Advanced Characterization of High-temperature Alloys: Phase Evolution during Manufacturing and Service-induced Deformation
||High Temperature Creep Properties along Concentration Gradients in Superalloys
||Lukas Haussmann, Steffen Neumeier, Mathias Göken
|On-Site Speaker (Planned)
A high temperature indentation creep approach with a 20 µm cylindrical flat punch has been developed to allow creep measurements on the micrometer scale. We have used this technique combined with a newly developed 1D positioning system, to investigate the concentration gradients of a Co-Ni diffusion couple and a multinary CoNi-base superalloy diffusion couple with increasing Cr content. This approach allows the microstructural and mechanical characterization of many alloy compositions in only one sample. For the Co-Ni diffusion couple it could be shown, that the creep strength at 550°C and the hardness increase up to 50Ni-50Co due to an increasing solid solution hardening. In the Co-base superalloy diffusion couple, a significantly increased content of Cr leads to additional tertiary phases and a decrease of γ′ volume fraction. However, hardness measurements and indentation creep experiments reveal an optimal Cr content for the best hardness, creep and oxidation properties.
||Characterization, High-Temperature Materials, Mechanical Properties