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Estimation of the heat transfer coefficient in melt spinning process
KTH, School of Information and Communication Technology (ICT), Material Physics (Closed 20120101). (Condensed Matter Physics)
2009 (English)In: Journal of Physics, Conference Series, ISSN 1742-6588, E-ISSN 1742-6596, Vol. 144, 012104- p.Article in journal (Refereed) Published
Abstract [en]

Effect of the quenching wheel velocity in the range 20.7-26.5 m/s on the cooling rate as well as on the structure and microtopology of the contact surfaces of the glass-forming FeNiPB melt-spun ribbons has been experimentally studied. Both the values of the cooling rate and heat transfer coefficient at the wheel-ribbon interface estimated from the temperature vs. time curves recorded during melt spinning runs are in the ranges (1.6-5.2)×10 6 K/s and (2.8-5.2)×10 5 Wm -2K -1, respectively, for ribbon thicknesses of 31.4-22.0 μm. It was found that the density of the air pockets at the underside surface of ribbons decreases while its average depth remains essentially unchanged with the wheel velocity. Using the surface quality parameters the values of the heat transfer coefficient in the areas of direct ribbon-wheel contact were evaluated to be ranging from 5.75 to 6.65×10 5 Wm -2K -1.

Place, publisher, year, edition, pages
2009. Vol. 144, 012104- p.
Keyword [en]
Air pockets, Contact surface, Cooling rates, Glass-forming, Melt spinning process, Melt-spun ribbons, Microtopology, Surface-quality parameters, Time curves, Wheel velocities, Cooling, Melt spinning, Wheels, Heat transfer coefficients
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-152431DOI: 10.1088/1742-6596/144/1/012104ISI: 000271827100104Scopus ID: 2-s2.0-80052808393OAI: oai:DiVA.org:kth-152431DiVA: diva2:754460
Conference
13th International Conference on Rapidly Quenched and Metastable Materials, August 24-29, 2008, Dresden, Germany
Note

QC 20141010

Available from: 2014-10-10 Created: 2014-09-26 Last updated: 2017-12-05Bibliographically approved

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