|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Accelerated Design and Testing of New Nickel Superalloys with Increased Creep Resistance
||Sabin Sulzer, Roger Reed, Angus Wilkinson
|On-Site Speaker (Planned)
Improved Ni-base superalloys for applications in industrial gas turbines must combine a set of material properties which imply certain trade-offs.
The Alloys-By-Design method is used to systematically reduce large compositional spaces to ideal compositions based on models for the most important characteristics: creep resistance, oxidation resistance, microstructural stability, density, and cost.
Constitutive equations for a physically-based model for creep resistance in the intermediate temperature/stress regime are developed. Several contributions influencing dislocation propagation are considered including lattice misfit, microstructure, and phase composition.
The evolution of dislocation density in matrix channels during tertiary creep is informed by correlative high-resolution EBSD and ECCI studies. This combination enables a qualitative and quantitative assessment of changes in dislocation arrangements.
Novel small-scale testing procedures with an Electro-Thermal Mechanical Testing machine allow rapid property assessment of new alloys. Standard creep tests can be interrupted at different stages, and specimens are used for the analysis mentioned above.
||Planned: Supplemental Proceedings volume