|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Deformation and Damage Mechanisms in High Temperature Ni, Co and Fe-based Superalloys
||Effects of Strain Rate and Temperature Variation on Dislocation Structures and Faults in a Polycrystalline Ni-based Superalloy
||Regina Schlütter, Olivier Messé, Enrique Galindo-Nava, Thomas Jackson, Catherine Rae
|On-Site Speaker (Planned)
Effects of varying strain rate and test temperature on active deformation mechanisms were investigated for a monomodal and a bimodal γ'-microstructure in Ni-based disc alloy RR1000. For alloy development purposes, dislocation reactions and faulting need to be understood in the elevated temperature regime, specifically effects of tertiary γ'. Tests were mainly conducted as monotonic tensile tests, supported by some tensile creep testing at high stresses close to the yield stress to assess and compare effects of the test method on deformation modes. Deformation mechanisms were identified through bright field transmission electron microscopy. Significant changes in the deformation modes between the various tensile conditions were observed, from pure APB-coupled shear to extended stacking faults dominating the deformation at 650°C, to a mixture of stacking fault shear types, commonly only observed under creep conditions, at higher temperatures.
This work was supported by Rolls-Royce plc and the EPSRC under EP/H022309/1, EP/H500375/1 and EP/M005607/1.
||Planned: Supplemental Proceedings volume