Novel Cooling Rate Correlations in Molten Metal Gas Atomization

Ciftci, Nevaf; Ellendt, N.; Coulthard, G.; Barreto, Erika Soares; Mädler, Lutz; Uhlenwinkel, Volker

doi:10.1007/s11663-019-01508-0

Cited by 56 publications

(31 citation statements)

References 44 publications

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“…The model was presented in detail earlier. [13] It has mainly an applicative approach aiming at correlating the behaviour of different alloys and atomization plants. It compares average cooling rates derived from Eq.…”

Section: Modelling Backgroundmentioning

confidence: 99%

“…Subscript ''x'' refers to thermophysical quantities of the alloy under investigation (Al-4.5Cu in the present work), which are related to the corresponding parameters of a reference system, identified by the subscript ''ref'', i.e. the Cu-6Sn alloy gas atomized in argon atmosphere of Reference [13]. This model is independent of the atomization equipment used and it can be in principle applied to different alloys since it only requires basic physical quantities of a reference system which may be available from literature databases.…”

Section: Modelling Backgroundmentioning

confidence: 99%

“…[1]. [13] In the present work, the correlation is checked for gas-atomized Al-4.5Cu. The Al-Cu system has been chosen because of the availability of previous studies on atomization and solidification.…”

Section: Introductionmentioning

confidence: 99%

“…The present study is aimed to characterize gas-atomized Al-4.5Cu powders as well as to investigate the efficiency of the semi-empirical model proposed by Ciftci et al [13] which predicts the cooling rate in molten metal gas atomization. Results are compared with literature and a heat transfer model is used to get insight into the role of convection, conduction and radiative dissipation when atomizing Al alloys.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

On the Cooling Rate-Microstructure Relationship in Molten Metal Gas Atomization

Gianoglio

Ciftci

Armstrong

et al. 2021

Metall Mater Trans A

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Gas atomization is the most used powder production technique since it provides good control on particles shape, surface oxidation and dimension. It is a rapid solidification technique involving fast cooling rates, which are strictly correlated to particle size. This relationship is typically described with a power law function that can be determined experimentally by measuring the microstructural length-scale or through the application of a heat transfer model. Both paths were exploited in the present work focusing on a gas-atomized Al-4.5Cu alloy. Atomized powders were characterized by means of X-ray diffraction, differential scanning calorimetry, light and scanning electron microscopy to investigate the relationship between cooling rate and microstructure length-scale. A recently proposed semi-empirical model was validated and discussed in terms of a physically based heat transfer approach. The change in gas-to-melt mass flow ratio (GMR) was also investigated showing that it does not affect appreciably the relationship between solidification rate and particle size, but does increase the Cu supersaturation in the powders of finer size.

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Section: Modelling Backgroundmentioning

confidence: 99%

Section: Modelling Backgroundmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

On the Cooling Rate-Microstructure Relationship in Molten Metal Gas Atomization

Gianoglio

Ciftci

Armstrong

et al. 2021

Metall Mater Trans A

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show abstract

“…In the past, we have shown that drop-on-demand droplet generation and solidification of the spheres are possible even for metals with high melting points, such as steels [22]. It has also been demonstrated that correlations for secondary dendrite arm spacing can be used to determine the average cooling rate of molten metal droplets during solidification in sprays [23,24] to obtain a better understanding of process conditions experimentally.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Adjustment of Spherical Micro-samples for High-Throughput Analysis Using a Drop-on-Demand Droplet Generator

2019

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High-throughput methods for the development of structural materials require samples which are comparable in geometric dimensions and microstructure. Molten metal droplet generators produce thousands of droplets and microspheres from specific alloys with very good reproducibility. In this study, droplet generation experiments were conducted with two alloys and their microstructure was analyzed regarding secondary dendrite arm spacing (SDAS) in order to determine cooling rates during solidification. A droplet cooling model was developed, and predictions showed good agreement with the experimental data. Finally, a sensitivity study was conducted using the validated model to identify critical process parameters which have great impact on the resulting microstructure and need to be well-controlled to achieve the desired reproducibility in microstructure.

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Atomization of Alloys

2024

Metallic Powders for Additive Manufacturing

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Novel Cooling Rate Correlations in Molten Metal Gas Atomization

Cited by 56 publications

References 44 publications

On the Cooling Rate-Microstructure Relationship in Molten Metal Gas Atomization

On the Cooling Rate-Microstructure Relationship in Molten Metal Gas Atomization

Microstructure Adjustment of Spherical Micro-samples for High-Throughput Analysis Using a Drop-on-Demand Droplet Generator

Atomization of Alloys

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