The Methodology of Analysis on Geometrical Changes of a Mixed Zone in Resistance-Heated Samples

The article presents the use of computer graphics methods and computational geometry for the analysis on changes of geometrical parameters for a mixed zone in resistance-heated samples. To perform the physical simulation series of resistance heating process, the Gleeble 3800 physical simulator, loca...

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Bibliographic Details
Published in:Archives of metallurgy and materials 2019-01, Vol.64 (4), p.1463-1470
Main Authors: Dębiński, T, Głowacki, M, Hojny, M
Format: Article
Language:English
Subjects:
Brittleness
Cold
Computational geometry
Computer graphics
Computer science
Computer simulation
Cooling
Differential equations
Electric currents
Experiments
Geometry
Heat conductivity
Heat transmission
Influence
Mechanical properties
Melting
Metallurgy
mixed zone
Mushy zones
Numerical models
Parameter estimation
Physical simulation
Process parameters
Resistance heating
Solids
Thermal simulators
visualization
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Summary:The article presents the use of computer graphics methods and computational geometry for the analysis on changes of geometrical parameters for a mixed zone in resistance-heated samples. To perform the physical simulation series of resistance heating process, the Gleeble 3800 physical simulator, located in the Institute for Ferrous Metallurgy in Gliwice, was used. The paper presents a description of the test stand and the method for performing the experiment. The numerical model is based on the Fourier-Kirchoff differential equation for unsteady heat flow with an internal volumetric heat source. In the case of direct heating of the sample, geometrical parameters of the remelting zone change rapidly. The described methodology of using shape descriptors to characterise the studied zone during the process allows to parametrise the heat influence zones. The shape descriptors were used for the chosen for characteristic timing steps of the simulation, which allowed the authors to describe the changes of the studied parameters as a function of temperature. Additionally, to determine the impact of external factors, the remelting zone parameters were estimated for two types of grips holding the sample, so-called hot grips of a shorter contact area with the sample, and so-called cold grips. Based on the collected data, conclusions were drawn on the impact of the process parameters on the localisation and shape of the mushy zone.
ISSN:1733-3490
2300-1909
DOI:10.24425/amm.2019.130114