Growth behavior of γ′ phase in a powder metallurgy nickel-based superalloy under interrupted cooling process

Fan, Xianqiang; Zhang, Ang; Guo, Zhipeng; Wang, X.; Yang, Jie; Zou, Jixing

doi:10.1007/s10853-018-3002-0

Cited by 24 publications

(4 citation statements)

References 41 publications

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“…As the solidification proceeds, a small quantity of liquid is transformed into the solid, and the solid increment is assumed to have the same orientation with that of the previously solidified ones. This method has been successfully verified in our previous work [ 18,32–34 ] and is physically closer to the real solidification condition.…”

Section: Mathematical Modelsupporting

confidence: 68%

Solution to Multiscale and Multiphysics Problems: A Phase‐Field Study of Fully Coupled Thermal‐Solute‐Convection Dendrite Growth

Zhang

Jiang

Guo³

et al. 2021

Advcd Theory and Sims

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Solidification process is a complex phase transition problem involving multiscale and multiphysical characteristics. To investigate the complex interaction, a high‐performance numerical scheme is developed to explore the thermal‐solute‐convection interaction during solidification. Al–Cu dendrite growth with the Lewis number ≈104 and Prandtl number ≈10−2 (or Schmidt number ≈102) is simulated and discussed. By constructing a multilevel data structure, this numerical scheme allows the time step magnified by 2–3 orders of magnitude in comparison with that for explicit methods. With the capacity of the acceleration strategy including parallel computing and adaptive mesh refinement, the computing efficiency can be further improved by 2–3 orders of magnitude. The combination of multilevel structure and acceleration strategy makes a problem of up to 109 uniform meshes much easier to handle. The coupled governing equations involving the multiscale and multiphysical characteristics are solved with high efficiency and high numerical stability, even when the solid fraction approaches 100%. Both single and multi‐dendrite growths are discussed to reveal the effect of the thermal‐solute‐convection interaction on the large‐scale 2D and 3D microstructure evolution. The presence of the liquid flow changes the distribution of both domain temperature and solute component, which changes dendrite morphology and growth dynamics.

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Section: Mathematical Modelsupporting

confidence: 68%

Solution to Multiscale and Multiphysics Problems: A Phase‐Field Study of Fully Coupled Thermal‐Solute‐Convection Dendrite Growth

Zhang

Jiang

Guo³

et al. 2021

Advcd Theory and Sims

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“…In the case of solid-state transformations, these conditions are not identical; precipitated morphology especially is not affected by solute redistribution or convection, and the role of elastic strain cannot be neglected in solid-state phase transformations [ 12 , 13 , 14 , 15 , 16 ]. Studies on the formation of solid-state dendrites in Ni-based alloys [ 13 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ] have shown that there are differences in the morphology and size of solid-solution dendrites and intermetallic compound dendrites due to different atomic diffusion mechanisms and crystal structures, which affect the evolution of dendrites. At present, the mechanism of nucleation, growth, and morphological evolution of proeutectoid FeAl in dendritic morphology in the solid state has not been reported.…”

Section: Introductionmentioning

confidence: 99%

The Mechanism of Dendrite Formation in a Solid-State Transformation of High Aluminum Fe-Al Alloys

Yang

Zhang

et al. 2023

Materials

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The mechanism of solid-state dendrite formation in high-aluminum Fe-Al alloys is not clear. Applying an in-situ observation technique, the real-time formation and growth of FeAl solid-state dendrites during the eutectoid decomposition of the high-temperature phase Fe5Al8 is visualized. In-situ experiments by HT-CSLM reveal that proeutectoid FeAl usually does not preferentially nucleate at grain boundaries regardless of rapid or slow cooling conditions. The critical radii for generating morphological instability are 1.2 μm and 0.9 μm for slow and rapid cooling, respectively. The morphology after both slow and rapid cooling exhibits dendrites, while there are differences in the size and critical instability radius Rc, which are attributed to the different supersaturation S and the number of protrusions l. The combination of crystallographic and thermodynamic analysis indicates that solid-state dendrites only exist on the hypoeutectoid side in high-aluminum Fe-Al alloys. A large number of lattice defects in the parent phase provides an additional driving force for nucleation, leading to coherent nucleation from the interior of the parent phase grains based on the orientation relationship {3¯30}Fe5Al8//{1¯10}FeAl, <111¯>Fe5Al8//<111¯>FeAl. The maximum release of misfit strain energy leads to the preferential growth of the primary arm of the nucleus along <111¯> {1¯10}. During the rapid cooling process, a large supersaturation is induced in the matrix, driving the Al atoms to undergo unstable uphill diffusion and causing variations in the concentration gradient as well as generating constitutional undercooling, ultimately leading to morphological instability and the growth of secondary arms.

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“…The use of superalloys is particularly dominant in aerospace engines and various industrial gas turbines. [1][2][3][4][5][6] However, the working conditions of Ni-Cr-Fe superalloys that have a working temperature of 800 C or higher are extremely demanding. The amount of water vapor in the exhaust gas reaches 20%, which accelerates the corrosion of the material; in addition, high-frequency cyclic stress results in fatigue damage and eventually material breakage.…”

Section: Introductionmentioning

confidence: 99%

“…Highly alloyed iron‐, nickel‐, and cobalt‐based superalloys are resistant to large complex stresses and maintain surface stability above 600 °C; therefore, they have a wide range of applications in high‐temperature environments, such as energy power, petrochemical industry, metallurgical mining, transportation, and glass building materials. The use of superalloys is particularly dominant in aerospace engines and various industrial gas turbines . However, the working conditions of Ni–Cr–Fe superalloys that have a working temperature of 800 °C or higher are extremely demanding.…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

et al. 2020

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The influences of the size and shape of the γ 0 phase and the type and distribution of carbides on the fracture behavior of a new Ni-Cr-Fe superalloy subjected to four different solution aging treatments are examined. The γ 0 phase and γ matrix of the L1 2-ordered structure maintain a coherent orientation relationship on the {100} and {110} atomic planes according to transmission electron microscopy observations. The material becomes stronger because the movement of dislocations is hindered by the γ 0 phase and MC (Nb-rich, Ti-rich) and M 23 C 6 (Cr-rich, Mo-rich) carbides. The two-stage aging system (850 C Â 4 h þ 730 C Â 4 h) substantially increases the size of the γ 0 phase. The solid solution sample shows a microporous-aggregated ductile fracture, and the solution-aged samples show a microporous-aggregated crystalline fracture according to scanning electron microscopy observations. The fracture mechanism is also discussed.

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Growth behavior of γ′ phase in a powder metallurgy nickel-based superalloy under interrupted cooling process

Cited by 24 publications

References 41 publications

Solution to Multiscale and Multiphysics Problems: A Phase‐Field Study of Fully Coupled Thermal‐Solute‐Convection Dendrite Growth

Solution to Multiscale and Multiphysics Problems: A Phase‐Field Study of Fully Coupled Thermal‐Solute‐Convection Dendrite Growth

The Mechanism of Dendrite Formation in a Solid-State Transformation of High Aluminum Fe-Al Alloys

Effect of Heat Treatment on the Microstructure and Fracture Behaviors of a Ni–Cr–Fe Superalloy

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