Effect of solidification parameters on the microstructures and properties of CMSX-10

Abstract. The effect of solidification parameters on the secondary dendrite arm spacing in a MAR-M247 Nibased superalloy has been studied by a novel approach, based on physical simulation of melting/solidification experiment with a constant cooling rate and variable temperature gradient. The applied experimental method proved to be efficient as it yielded a spread of microstructures corresponding to a range of well controlled solidification rates in a single melting/solidification experiment. In addition, it has been demonstrated that secondary dendrite arm spacing is better related to the solidification rate than to the cooling rate in the case when significant variations of thermal parameters during the solidification process occur.

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“…Similar results were also reported in the earlier works [1,[5][6][7][8][16][17][18][19][20]. The trendline equation:…”

Section: Resultssupporting

confidence: 88%

Effect of solidification parameters on the secondary dendrite arm spacing in MAR M-247 superalloy determined by a novel approach

Milenković

Rahimian

Sabirov

et al. 2014

MATEC Web of Conferences

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“…In the literature, it is shown that it is easier to determine the c¢ solvus temperature for non-heat-treated material during cooling. [30][31][32] Nevertheless, since we want to characterize the behavior of the as-cast and as-built material during heat treatment heating conditions, the focus is on heating.…”

Section: Thermo-analysismentioning

confidence: 99%

“…Thus, strong element segregations present in the as-cast material lead to a wide range of the c¢-solvus temperature. [26,32] As a consequence of SEBM processing, size, distribution, and volume fraction of the c¢ precipitates are very homogenous. A difference between the dendritic core and the interdendritic region is barely noticeable.…”

Section: Thermo-analysismentioning

confidence: 99%

Microstructure of the Nickel-Base Superalloy CMSX-4 Fabricated by Selective Electron Beam Melting

Ramsperger

Singer

Körner

2016

Metall Mater Trans A

194

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Powder bed-based additive manufacturing (AM) processes are characterized by very hightemperature gradients and solidification rates. These conditions lead to microstructures orders of magnitude smaller than in conventional casting processes. Especially in the field of high performance alloys, like nickel-base superalloys, this opens new opportunities for homogenization and alloy development. Nevertheless, the high susceptibility to cracking of precipitation-hardenable superalloys is a challenge for AM. In this study, electron beam-based AM is used to fabricate samples from gas-atomized pre-alloyed CMSX-4 powder. The influence of the processing strategy on crack formation is investigated. The samples are characterized by optical and SEM microscopy and analyzed by microprobe analysis. Differential scanning calorimetry is used to demonstrate the effect of the fine microstructure on characteristic temperatures. In addition, in situ heat treatment effects are investigated.

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“…With increasing withdrawal rate, the diffusion time for homogenous solid backdiffusion decreases significantly, resulting in the increased degree of segregation for the constituent elements, particularly for the strong segregation element Re, W, Al, and Ta. [21] Therefore, compared to the results of the DSQ technique, the Re and Ru show much stronger influences on the segregation of Re, W, Al, and Ta at higher withdrawal rates. …”

Section: A Segregationmentioning

confidence: 81%

“…However, it should be noted that the segregation of constituent elements is also closely related to the processing conditions, such as cooling rate, thermal gradient, convection of liquid metal, casting shape, orientation of single-crystal, and so on. [15,[19][20][21][22] In the current study, we mainly focus on the solidification characteristics of Re-and Ru-containing single-crystal superalloys and their influences on the segregation.…”

Section: A Segregationmentioning

confidence: 99%

Effects of Re and Ru on the Solidification Characteristics of Nickel-Base Single-Crystal Superalloys

Liu

Zhao

et al. 2011

Metall Mater Trans A

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The solidification characteristics, such as the phase transformation temperature and partition coefficient, were investigated in four Ni-base single-crystal superalloys with varied contents of Re and Ru. Differential scanning calorimetry (DSC) analysis reveals that the liquidus and solidus temperatures decrease with increasing levels of Re additions. However, the Ru only has negligible influences on the liquidus and solidus temperatures. The partition coefficient of constituent elements is investigated by using the directional solidification followed quenching (DSQ) technique. Re is found to reduce the segregation of Re and W, whereas Ru only has negligible effects on the segregation of Re and W. For comparison, the matrix scanning is performed on the representative dendritic structures. With increasing withdrawal rate, Re and Ru additions show the stronger influences on segregation behavior of alloying elements, particularly for Al and Ta.

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Effect of solidification parameters on the microstructures and properties of CMSX-10

Cited by 101 publications

References 6 publications

Effect of solidification parameters on the secondary dendrite arm spacing in MAR M-247 superalloy determined by a novel approach

Effect of solidification parameters on the secondary dendrite arm spacing in MAR M-247 superalloy determined by a novel approach

Microstructure of the Nickel-Base Superalloy CMSX-4 Fabricated by Selective Electron Beam Melting

Effects of Re and Ru on the Solidification Characteristics of Nickel-Base Single-Crystal Superalloys

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