‘Herringbone’ defect formation in planar-flow melt spinning

Cox, Brenton L.; Steen, Paul H.

doi:10.1016/j.jmatprotec.2013.04.009

Cited by 16 publications

(3 citation statements)

References 20 publications

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“…The casting process parameters mainly include the temperature of molten alloy, applied pressure of the molten alloy to the bottom of the nozzle, the nozzle–wheel distance, velocity of cooling wheel substrate, and temperature and flow rate of coolant in the cooling wheel. PFC processes have been the subject of numerous studies by a number of scientists and engineers, with the emphases mainly focused on puddle formation [ 11 , 12 ] and process stability [ 13 , 14 ], as well as the influences of processing parameters and processing conditions on materials structure [ 15 , 16 ], ribbon thickness [ 17 , 18 ], and ribbon surface topography [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Reducing the Core Losses of Fe-Si-B Amorphous Alloy Ribbons by High Cooling Rate Planar Flow Casting

Wang

Liu

et al. 2022

Materials

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In the planar flow casting (PFC) process, the cooling rate significantly affects the structure and properties of a cast ribbon. The influence of the thermal conductivity of the cooling wheel substrate on cooling rate was simulated by a numerical method, and it is shown that a higher thermal conductivity of the cooling wheel substrate leads to a higher cooling rate in the PFC process. Two copper-beryllium (Cu-2Be) rings with thermal conductivities of 175.3 W/m·K and 206.5 W/m·K were manufactured and installed onto a wheel core as the substrate of the cooling wheel. The effects of cooling rate on the soft magnetic properties of Fe-Si-B amorphous ribbons were investigated by pragmatic ribbon casting. The results show that the increment in the thermal conductivity of the cooling wheel substrate from 175.3 W/m·K to 206.5 W/m·K lowered the coercive force of amorphous ribbon from 2.48 A/m to 1.92 A/m and reduced the core losses at 1.4 T and 50 Hz by up to 22.1%.

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Section: Introductionmentioning

confidence: 99%

Reducing the Core Losses of Fe-Si-B Amorphous Alloy Ribbons by High Cooling Rate Planar Flow Casting

Wang

Liu

et al. 2022

Materials

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“…PFMS involves the deposition of molten metal through a nozzle onto the surface of a rotating cold wheel, on which the metal solidifies into a thick film or ribbon. [3][4][5] The speed of the wheel has a significant impact on cooling rates and film thicknesses. Typical film thicknesses obtained in PFMS for metals can range from 8 lm to a few hundred micrometers, depending on the material being cast as well as on the processing conditions.…”

Section: Introductionmentioning

confidence: 99%

Novel Ballistic Processing of Thick Films: Structural Evolution and Mechanical Behavior

Hille

Youssef

Azadfallah

et al. 2020

Metall Mater Trans A

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Ballistic processing (BP) is a new process that promises almost instantaneous processing of thick and thin films, through the acceleration of a carrier through a molten metal stream. The mechanisms by which such films are produced are difficult to study due to the ultrarapid processing speeds involved. In this article, we use the thermal properties of the carrier to reveal the mechanisms of formation of these films. High-speed imaging and extensive postprocessing characterization were used to arrive at a fundamental understanding of the microstructural evolution of thick films in BP. Results show that the thermal characteristics of the carrier material play a role in the morphology, topography, structure, and mechanical behavior of the processed films. An increase in carrier thermal conductivity generally resulted in an increase in film thickness and apparent elastic modulus. Increasing the carrier speed beyond the current limit is forecasted to decrease the thickness and improve the properties.

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“…Tkatch et al [51] found that the cooling rate ranges between 4 x 10' * and 6.9 x 10*K/s and the ribbon thickness decreases from 92 to 18 ^m with increasing wheel speed from 9 to 30.5 m/s in melt spinning of Fe4oNÍ4oPi4B6. Cox and Steen [52] observed that herringbone formation was influenced by the substrate motion of translation in the planar-flow process.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Analytical Modeling of Free-Jet Melt Spinning for Fe75−Si10−B15 (at. %) Metallic Glasses

Wang

Mitra

2014

Journal of Heat Transfer

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Amorphous fiber, ribbon, or film is produced through melt spinning. In this manufacturing process, a continuous delivery of amorphous material is simultaneously dependent on the wheel spinning rate, metallic liquid viscosity, surface tension force, heat transfer inside the melt pool and along the substrate, and other parameters. An analysis of a freejet melt spinning for fiber manufacture has been performed to relate the process control parameters with amorphous formation. We present a numerical simulation of transient impingement of a free melt jet with a rapidly rotating wheel, along with theoretical estimates of melt ribbon thickness, to investigate dynamical characteristics of the flow in melt pool. The nucleation temperature and the critical cooling rate are predicted in the paper for alloy Feys-Siio-Bjs (at. %). Thermal conduction is found to dominate undercooling in melt spinning by comparing the temperature and velocity measurements with our numerical simulation and the analytical solutions.

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‘Herringbone’ defect formation in planar-flow melt spinning

Cited by 16 publications

References 20 publications

Reducing the Core Losses of Fe-Si-B Amorphous Alloy Ribbons by High Cooling Rate Planar Flow Casting

Reducing the Core Losses of Fe-Si-B Amorphous Alloy Ribbons by High Cooling Rate Planar Flow Casting

Novel Ballistic Processing of Thick Films: Structural Evolution and Mechanical Behavior

Numerical and Analytical Modeling of Free-Jet Melt Spinning for Fe75−Si10−B15 (at. %) Metallic Glasses

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