The effect of heat treatment on the homogenization of CMSX-4 Single-Crystal Ni-Based Superalloy

Paraschiv, Alexandru; Matache, Gheorghe; Puşcaşu, Cristian

doi:10.1016/j.trpro.2018.02.027

Cited by 21 publications

(8 citation statements)

References 10 publications

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“…This is in agreement with the results presented in this study. Other studies have also shown other variations in Mo partitioning, with Mo noted to partition into IDRs in some investigations, and DCs in others, all when looking at as-cast materials [13,43]. Overall, these works combined with the current study suggest that the partitioning behaviour of Mo is highly dependent on alloy composition and heat treatment, underlining the need for further dedicated studies.…”

Section: Microsegregationsupporting

confidence: 66%

“…Despite post-solidification heat treatments designed to homogenise the alloy, a degree of segregation persists leading to chemical heterogeneity between the dendrites and interdendritic regions, which cannot be fully eliminated due to the impractical treatment times and costs required [10]. Previous studies employing EDX and EPMA have convincingly shown Re, Co and W segregating into the dendrite cores (DCs) and Al, Ti and Ta enriching interdendritic regions (IDRs), with the partitioning extent decreasing with progressively longer and hotter heat treatments [11][12][13]. Although element partitioning behaviour has been extensively mapped on the micrometre scale between DCs and IDRs, to date, fewer studies have attempted to measure the extent of segregation on the nanoscale and its subsequent effects on the local compositions of γ and γ'.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Microsegregation and Heat Treatment on Localised Γ and Γ’ Compositions in Single Crystal Ni-Based Superalloys

Strutt

Bagot

Moody

et al. 2023

Preprint

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Section: Microsegregationsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Effect of Microsegregation and Heat Treatment on Localised Γ and Γ’ Compositions in Single Crystal Ni-Based Superalloys

Strutt

Bagot

Moody

et al. 2023

Preprint

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“…This could also be deduced from the elemental distribution shown in Figure 9c,g. Remarkably, the coarse γ phase and the irregular cubic γ phase gathered around the eutectic; the heterogeneous region was about 3.5 µm in width and was caused by an inadequate heat-treatment process [22]. The width of the coarse γ phase was 100 nm to 400 nm, shown as red arrows in Figure 9b, which is much wider than that of the regular γ phase with a value of about 70 nm.…”

Section: Microstructure and Element Distribution Around The Eutecticmentioning

confidence: 96%

Crack Propagation Behavior of a Ni-Based Single-Crystal Superalloy during In Situ SEM Tensile Test at 1000 °C

et al. 2020

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An in situ scanning electron microscope (SEM) tensile test for Ni-based single-crystal superalloy was carried out at 1000 °C. The stress displacement was obtained, and the yield strength and tensile strength of the superalloy were 699 MPa and 826 MPa, respectively. The crack propagation process, consisting of Model I crack and crystallographic shearing crack, was determined. More interestingly, the crack propagation path and rate affected by eutectics was directly observed and counted. Results show that the coalescence of the primary crack and second microcrack at the interface of a γ/γ′ matrix and eutectics would make the crack propagation rate increase from 0.3 μm/s to 0.4 μm/s. On the other hand, crack deflection decreased the rate to 0.05 μm/s. Moreover, movement of dislocations in front of the crack was also analyzed to explain the different crack propagation behavior in the superalloy.

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“…The standard heat treatment normally contains two steps: solution heat treatment and aging heat treatment. The temperature of solution heat treatment is above 1550 K. It is relatively high because the melting point of the SX is 1600 K. After the solution heat treatment, the coarse γ′ phase, and the other segregation tend to be invisible under an optical microscope, and the difference of the alloy element between dendritic and interdendritic tend to be consistent [ 4 ] The critical elements (Re, W, Al, Ti, and Ta) become more uniform as the solution heat treatment time increases from 2 h to 16 h. The distribution coefficients of these elements seem to depend strongly on the solution temperature and time [ 5 ]. The lattice constants and misfit values of different SX superalloys are different after full heat treatment.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of As-Cast and Heat-Treated Single-Crystal Ni-Based Superalloy Interface Using TEM

Han

et al. 2023

Nanomaterials

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The interface plays an important role in determining strength and toughness in multiphase systems and the accurate measurement of the interface structure in single crystal (SX) Ni-based superalloy is also essential. In this work, the γ and γ′ lattice constant, γ/γ′ interface width at dendritic and interdendritic region of casting and solution treatment SX Ni-based superalloy is measured. Various advanced equipment is used to characterize γ/γ′ interface nanostructure. A typical correlation between interface width and γ/γ′ misfit is also summarized. The interface width in the dendritic region of the as-cast sample is larger than that in the interdendritic region. The misfit in the dendritic region is larger than that in the interdendritic region, which has a trend of negative development. There is a common law of the as-cast interdendritic and dendrite interface sample, where the absolute value of the misfit between the two phases is increasing with the phase interface broadening. The comparison of the as-cast and heat-treated interdendritic sample shows that after heat treatment, the phase interface width increases, the misfit decreases, the lattice constant of γ phase increases, and the lattice constant of the γ′ phase decreases. By comparing the as-cast and heat treated dendrites, the absolute value of the misfit of the as-cast dendrite sample is significantly smaller than that of the heat-treated sample, and the misfit increases with the interface broadening. The comparison between interdendritic and dendritic heat-treated samples shows that the absolute value of the misfit between the two phases is smaller than that of the dendritic as-cast samples, and the absolute value of the misfit also increases with the phase interface broadening. In conclusion, property heat treatment can significantly increase the lattice constants of the γ and γ’ phases, reduce the lattice mismatch at the interface of the two phases, and improve the high temperature stability of the alloy. A better understanding of the microstructure of Ni-based single crystal superalloys will provide guidance for the subsequent design of more advanced nickel-based single-crystal superalloys.

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The effect of heat treatment on the homogenization of CMSX-4 Single-Crystal Ni-Based Superalloy

Cited by 21 publications

References 10 publications

Effect of Microsegregation and Heat Treatment on Localised Γ and Γ’ Compositions in Single Crystal Ni-Based Superalloys

Effect of Microsegregation and Heat Treatment on Localised Γ and Γ’ Compositions in Single Crystal Ni-Based Superalloys

Crack Propagation Behavior of a Ni-Based Single-Crystal Superalloy during In Situ SEM Tensile Test at 1000 °C

Experimental Study of As-Cast and Heat-Treated Single-Crystal Ni-Based Superalloy Interface Using TEM

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