Nucleation of recrystallisation in castings of single crystal Ni-based superalloys

Mathur, Harshal N.; Panwisawas, Chinnapat; Jones, C.N.; Reed, Roger C.; Rae, C.M.F.

doi:10.1016/j.actamat.2017.02.058

Cited by 43 publications

(14 citation statements)

References 30 publications

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“…In the presence of such non-equilibrium (eutectic) phases, it has been shown that deformation is concentrated near this eutectic morphology. The accumulated plastic strain subsequently promotes recrystallisation during subsequent solutioning to eliminate micro-segregation [12,13]. This is additionally confirmed by other studies, which report that dendrite cores (segregated in W and Re) which are the regions that solidify first are virtually dislocation free.…”

supporting

confidence: 75%

Relating micro-segregation to site specific high temperature deformation in single crystal nickel-base superalloy castings

D’Souza

Roebuck

Collins

et al. 2020

Materials Science and Engineering: A

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supporting

confidence: 75%

Relating micro-segregation to site specific high temperature deformation in single crystal nickel-base superalloy castings

D’Souza

Roebuck

Collins

et al. 2020

Materials Science and Engineering: A

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“…For mass production of nickel-based single-crystal superalloys with superior properties through hardening mechanisms, an investment casting process has been used. During production, however, several different kinds of defects are often discovered, such as surface scale, stray grains, freckle chain grains, equiax grains, low-angle grains [10] and recrystallized grains [10][11][12][13][14][15]. In addition, several different types of particles are often found as well, such as brittle topologically close packed (TCP) phases and rhenium-rich particles.…”

Section: Introductionmentioning

confidence: 99%

General View of Rhenium-Rich Particles along Defect Grain Boundaries Formed in Nickel-Based Single-Crystal Superalloy Turbine Blades: Formation, Dissolution and Comparison with Other Phases

Park

Withey

2021

Crystals

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Nickel-based single-crystal superalloy turbine blades have been widely used in engines of aircrafts or power plants, but some defect grains are often found on the surface of the blade after full heat treatment or even after casting. Rhenium-rich particles, as well as an intermediate layer, were almost always detected along any defect grain boundary region, if it existed, from a low-angle grain boundary to a high-angle boundary. The particles were also found on the top surface of the base material. The composition and morphology of the particles were different from the most common topologically close packed phases or a fine particle with similar morphology detected at the boundary region between a recrystallized grain and a matrix grain. An additional heat treatment could completely dissolve the fine particles. Furthermore, any rhenium-rich particles were not re-formed after achieving uniform distribution of the alloying elements.

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“…Zhuo et al [ 13 ] reported that formation and migration of dense dislocation walls had been observed in an SX Ni-base superalloy by Transmission electron microscope (TEM); concurrently, the SX matrix was cut into subgrains which are the precursor of cellular RX. In addition, a new RX mode induced by micro-grains of γ’ phases in surface eutectics was observed by Mathur et al [ 14 ]. Recent studies have reported that some second phases such as carbides usually form with the migration of RX grain boundaries due to their high solubility [ 15 ].…”

Section: Introductionmentioning

confidence: 94%

Experimental and Numerical Studies on Recrystallization Behavior of Single-Crystal Ni-Base Superalloy

Wang

Xiao-nan³

et al. 2018

Materials

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The recrystallization (RX) behavior of superalloy during standard solution heat treatment (SSHT) varies significantly with deformation temperature. Single-crystal (SX) samples of Ni-base superalloy were compressed to 5% plastic deformation at room temperature (RT) and 980 °C, and the deformed samples were then subjected to SSHT process which consists of 1290 °C/1 h, 1300 °C/2 h, and 1315 °C/4 h, air cooling. RT-deformed samples showed almost no RX grains until the annealing temperature was elevated to 1315 °C, while 980 °C-deformed samples showed a large number of RX grains in the initial stage of SSHT. It is inferred that the strengthening effect of γ’ phases and the stacking faults in them increase the driving force of RX for 980 °C-deformed samples. The RX grains nucleate and grow in dendritic arms preferentially when the microstructural inhomogeneity is not completely eliminated by SSHT. A model coupling crystal plasticity finite element method (CPFEM) and cellular automaton (CA) method was proposed to simulate the RX evolution during SSHT. One ({111} <110>) and three ({111} <110>, {100} <110>, {111} <112>) slip modes were assumed to be activated at RT and 980 °C in CPFEM calculations, respectively. The simulation takes the inhomogeneous as-cast dendritic microstructure into consideration. The simulated RX morphology and density conform well to experimental results.

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Nucleation of recrystallisation in castings of single crystal Ni-based superalloys

Cited by 43 publications

References 30 publications

Relating micro-segregation to site specific high temperature deformation in single crystal nickel-base superalloy castings

Relating micro-segregation to site specific high temperature deformation in single crystal nickel-base superalloy castings

General View of Rhenium-Rich Particles along Defect Grain Boundaries Formed in Nickel-Based Single-Crystal Superalloy Turbine Blades: Formation, Dissolution and Comparison with Other Phases

Experimental and Numerical Studies on Recrystallization Behavior of Single-Crystal Ni-Base Superalloy

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