Effect of withdrawal rate on the microsegregation, thermophysical properties and spatial orientation of a Ni3Al based single crystal superalloy

Ai, Cheng; Zhou, Jian; Li, Shusuo; Zhang, Heng; Pei, Yanling; Gong, Shengkai

doi:10.1016/j.jallcom.2015.11.082

Cited by 16 publications

(2 citation statements)

References 47 publications

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“…It is widely known that element segregation is mainly affected by temperatures [17]. In this work, only the crystal orientation was changed, but the cooling rate was not changed.…”

Section: Dendritic Segregationmentioning

confidence: 99%

Effect of secondary orientation on the microstructures in thin-walled castings of nickel-based single-crystal superalloys

Xu,

Huang,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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With the increasing turbine inlet temperature of aero-engine, the requirement of temperature capacity of turbine blades is more stringent. A variety of complex cooling structures have been designed, among which the micro cooling represented by lamilloy is the latest development. At present, the thickness of lamilloy turbine blade is 0.5 mm or less. The reason for performance degradation caused by thin-walled is still controversial and the understanding of dendrite growth behaviour under space constraints is insufficient. In this study, 0.75 mm wall thickness nickel-based superalloy DD403 samples were cast by high-rate directional solidification. The growth and evolution of dendrites in plank-shaped specimens with different secondary deviation angles were investigated. The variation of dendrite spacing and the arrangement of dendrites under different secondary deviation angles were studied. It is found that the primary dendrite arm spacing in the thin-walled region decreased with the increase of the secondary deviation angle, but there was no significant change in the average size of γ′ phases and elements segregation.

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“…It is widely known that element segregation is mainly affected by temperatures [17]. In this work, only the crystal orientation was changed, but the cooling rate was not changed.…”

Section: Dendritic Segregationmentioning

confidence: 99%

Effect of secondary orientation on the microstructures in thin-walled castings of nickel-based single-crystal superalloys

Xu,

Huang,

Zhang

et al. 2024

J. Phys.: Conf. Ser.

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“…As engine components' service temperature continuously rises, intermetallic-based superalloys owning better performance have been chosen as prime alternate high-temperature structural materials [1,2]. Due to their low density, excellent oxidation resistance and favorable thermal conductivity at high temperatures [3], Ni 3 Al phase becomes the fundamental strengthening phase in Ni-Al series intermetallic-based superalloys [4], which have been successfully developed as cast polycrystalline superalloys [5], single-crystal superalloys [6] and powder metallurgy superalloys [7]. Cast polycrystalline Ni 3 Al-based superalloys with equiaxed grains or columnar grains have been usually used as blades in different cooling stages of turbine with consideration for its lower costs of replacement and repair [8].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Zhang

Peng

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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In this work, water cooling, air cooling (AC) and furnace cooling (FC) were applied to investigate the effect of cooling rate on microstructure evolution of primary γ′ in a newly designed Ni 3 Al-based alloy. The results showed that nucleation rate of primary γ′ increased with increasing cooling rate. In addition, higher cooling rate shortened growth period of primary γ′, which made its morphology close to the initial precipitated γ′. For AC and FC specimens, due to the lower cooling rate, primary γ′ possessed longer growth period and its morphology was mainly due to the evolution of lattice misfit between γ and primary γ′. Meanwhile, growth of primary γ′ depended on lattice misfit distribution between its corner and edge area. Moreover, primary γ′ morphologies of sphere, cube and concave cube with tip corners were illustrated by considering interaction between elemental diffusion and elastic strain energy.

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Influence of Microstructural Homogenization on the Localized Deformation Behavior of Single-Crystal Ni-Based Superalloy, CMSX-4

Nath,

Scholz,

Pfetzing

et al. 2023

Metall Mater Trans A

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Effect of withdrawal rate on the microsegregation, thermophysical properties and spatial orientation of a Ni3Al based single crystal superalloy

Cited by 16 publications

References 47 publications

Effect of secondary orientation on the microstructures in thin-walled castings of nickel-based single-crystal superalloys

Effect of secondary orientation on the microstructures in thin-walled castings of nickel-based single-crystal superalloys

Microstructure Evolution of Primary γ′ Phase in Ni3Al-Based Superalloy

Influence of Microstructural Homogenization on the Localized Deformation Behavior of Single-Crystal Ni-Based Superalloy, CMSX-4

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