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Dsouza, Neil
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Publications (4/4 displayed)
- 2021Ultra-high temperature deformation in a single crystal superalloycitations
- 2020Relating micro-segregation to site specific high temperature deformation in single crystal nickel-base superalloy castingscitations
- 2018History dependence of the microstructure on time-dependent deformation during in-situ cooling of a nickel-based single crystal superalloycitations
- 2017The contrasting roles of creep and stress relaxation in the time-dependent deformation during in-situ cooling of a nickel-base single crystal superalloycitations
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article
The contrasting roles of creep and stress relaxation in the time-dependent deformation during in-situ cooling of a nickel-base single crystal superalloy
Abstract
Time dependent plastic deformation in a single crystal nickel-base superalloy during cooling from casting relevant temperatures has been studied using a combination of <i style="color: rgb(34, 34, 34); font-family: Lora, Palatino, Times, "Times New Roman", serif; font-size: 17px; letter-spacing: 0.17px;">in-situ</i> neutron diffraction, transmission electron microscopy and modelling. Visco-plastic deformation during cooling was found to be dependent on the stress and constraints imposed to component contraction during cooling, which mechanistically comprises creep and stress relaxation. Creep results in progressive work hardening with dislocations shearing the γ′ precipitates, a high dislocation density in the γ channels and near the γ/γ′ interface and precipitate shearing. When macroscopic contraction is restricted, relaxation dominates. This leads to work softening from a decreased dislocation density and the presence of long segment stacking faults in γ phase. Changes in lattice strains occur to a similar magnitude in both the γ and γ′ phases during stress relaxation, while in creep there is no clear monotonic trend in lattice strain in the γ phase, but only a marginal increase in the γ′ precipitates. Using a visco-plastic law derived from <i style="color: rgb(34, 34, 34); font-family: Lora, Palatino, Times, "Times New Roman", serif; font-size: 17px; letter-spacing: 0.17px;">in-situ</i> experiments, the experimentally measured and calculated stresses during cooling show a good agreement when creep predominates. However, when stress relaxation dominates accounting for the decrease in dislocation density during cooling is essential.