A study on the effect of composition, and the mechanisms of recrystallisation in single crystal Ni-based superalloys

Mathur, Harshal N.; Jones, Nicholas Blurton; Rae, C.M.F.

doi:10.1051/matecconf/20141407003

Cited by 9 publications

(2 citation statements)

References 20 publications

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“…This phenomenon is termed as re-crystallisation. To a lesser extent, re-crystallisation is also dependent on the alloy composition [17], as well as the presence of the non-equilibrium γ/γ / eutectic; the latter has been proposed to act as pinning sites for the grain boundary and thereby retards growth of the re-crystallised grains [18]. Some key questions persist on the nucleation mechanism of these re-crystallised grains [19 -23] and the critical "inelastic" strains and their temperature dependence [16,24,25].…”

Section: Introductionmentioning

confidence: 99%

The role of stress relaxation and creep during high temperature deformation in Ni-base single crystal superalloys – Implications to strain build-up during directional solidification

et al. 2016

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Section: Introductionmentioning

confidence: 99%

The role of stress relaxation and creep during high temperature deformation in Ni-base single crystal superalloys – Implications to strain build-up during directional solidification

et al. 2016

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“…Hence, the microstructure must play a key role in determining the susceptibility of an alloy to recrystallise. This has a direct relationship to the bulk alloy composition, which has been demonstrated to have some dependency on recrystallisation [12]. Finally, the dissolution of phases during recrystallisation is enhanced by the presence of residual stresses [13].…”

Section: Introductionmentioning

confidence: 96%

Ultra high-temperature deformation in a single crystal superalloy: Meso-scale process simulation and micro-mechanisms

Tang¹,

D’Souza²,

Roebuck³

et al. 2020

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A mesoscale study of a single crystal nickel-base superalloy subjected to an industrially relevant process simulation has revealed the complex interplay between microstructural development and the micromechanical behaviour. As sample gauge volumes were smaller than the length scale of the highly cored structure of the parent material from which they were produced, their subtle composition differences gave rise to differing work hardening rates, influenced by varying secondary dendrite arm spacings, γ phase solvus temperatures and a topologically inverted γ/γ microstructure. The γ precipitates possessed a characteristic 'X' morphology, resulting from the simultaneously active solute transport mechanisms of thermally favoured octodendritic growth and N-type rafting, indicating creep-type mechanisms were prevalent. High resolution-electron backscatter diffraction (HR-EBSD) characterisation reveals deformation patterning that follows the γ/γ microstructure, with high geometrically necessary dislocation density fields localised to the γ/γ interfaces; Orowan looping is evidently the mechanism that mediated plasticity. Examination of the residual elastic stresses indicated the 'X' γ precipitate morphology had significantly enhanced the deformation heterogeneity, resulting in stress states within the γ channels that favour slip, and that encourage further growth of γ precipitate protrusions. The combination of such localised plasticity and residual stresses are considered to be critical in the formation of the recrystallisation defect in subsequent post-casting homogenisation heat treatments.

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Castability and Recrystallization Behavior of γ′-Strengthened Co-Base Superalloys

et al. 2020

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A study on the effect of composition, and the mechanisms of recrystallisation in single crystal Ni-based superalloys

Cited by 9 publications

References 20 publications

The role of stress relaxation and creep during high temperature deformation in Ni-base single crystal superalloys – Implications to strain build-up during directional solidification

The role of stress relaxation and creep during high temperature deformation in Ni-base single crystal superalloys – Implications to strain build-up during directional solidification

Ultra high-temperature deformation in a single crystal superalloy: Meso-scale process simulation and micro-mechanisms

Castability and Recrystallization Behavior of γ′-Strengthened Co-Base Superalloys

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