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Surface tension measurements of industrial steels - DLR contribution to ThermoLab-Midterm Report

Schmidt-Hohagen, Frank and Egry, Ivan (2005) Surface tension measurements of industrial steels - DLR contribution to ThermoLab-Midterm Report. Project Report.

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Abstract

Industrial alloys are generally multi-component systems with volatile and highly reactive components. Consequently, their processing in the liquid state requires special precautions. Therefore, the existing electromagnetic-levitation device with a high-vacuum chamber, designed for surface tension measurements, was modified and improved for this task. For the measurements of the surface tensions with the help of the oscillating drop technique the temperatures and the video sequences of the levitated, molten alloy were recorded without contact by pyrometer and by high-speed camera, respectively. This method yields the frequencies of the surface oscillations of the sample around the equilibrium shape and - using the modified Rayleigh law - the values of the surface tension. With the help of this method two commercial industrial steels were processed in the new EML-apparatus for ESA`s Thermolab project : the CORUS - low alloyed steel and the SANDVIK - high alloyed steel ( SAF 2507 ) .

Document Type:Monograph (Project Report)
Title:Surface tension measurements of industrial steels - DLR contribution to ThermoLab-Midterm Report
Authors:
AuthorsInstitution or Email of Authors
Schmidt-Hohagen, FrankUNSPECIFIED
Egry, IvanUNSPECIFIED
Date:June 2005
Journal or Publication Title:ThermoLab High-Precision Thermophysical Property Data of Liquid Metals for Modelling of Industrial Solidification Processes: Mid-Term-Report
Editors:
EditorsEmail
Fecht, H.-J.UNSPECIFIED
Wunderlich, R.K.UNSPECIFIED
Status:Published
Keywords:Industrial alloys, electromagnetic-levitation, surface tension, oscillating drop technique, surface oscillations, Rayleigh law
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Institute of Space Simulation > Center for Solidification of Undercooled Melts (ZEUS)
Deposited By: Frank Schmidt-Hohagen
Deposited On:26 Oct 2006
Last Modified:27 Apr 2009 12:56

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