Vliv místní doby tuhnutí na materiálovou strukturu tuhnoucí keramiky EUCOR

The effect of the computed local solidification time on the material structure of solidified ceramics EUCOR

článek ve sborníku ve WoS nebo Scopus

en

Corundo-baddeleyit material (CBM) – EUCOR – is a heat- and wear-resistant material even at extreme temperatures. This article introduces a numerical model of solidification and cooling of this material in a non-metallic mold. The numerical model is capable of determining the total solidification time of the casting and also the place of the casting which solidifies last. Furthermore, it is possible to calculate the temperature gradient at any point and time, the local solidification time and determine the solidification interval of any point. The local solidification time is one of the input parameters for the cooperating model of chemical heterogeneity. This second model and its application on EUCOR samples prove that the applied method of measuring the chemical heterogeneity provides the detailed quantitative information on the material structure and makes it possible to analyze the solidification process. The analysis of this process entails statistical processing of the measurement results of the heterogeneity of the EUCOR components and performs the correlation of individual components during solidification. The verification of both numerical models was conducted on a real cast 350 x 200 x 400 mm block.

Korundo baddeleytický materiál Eucor je tepelně a otěruvzdorný materiál i při vysokých teplotách. Pro řešení numerického modelu tuhnutí odlitku a okolí byl použit software ANSYS. Je předložena originální optimalizace technologie odlévání. Vypočtená lokální doba tuhnutí v libovolných bodech modelu je použita při řešení kooperujícího modelu chemické heterogenity, který podává detailní kvantitativní informace o struktuře materiálu a umožňuje analyzovat proces tuhnutí. Ověření obou modelů proběhlo na odlitku 350x200x400 mm.

Corundo-baddeleyit material (CBM) – EUCOR – is a heat- and wear-resistant material even at extreme temperatures. This article introduces a numerical model of solidification and cooling of this material in a non-metallic mold. The numerical model is capable of determining the total solidification time of the casting and also the place of the casting which solidifies last. Furthermore, it is possible to calculate the temperature gradient at any point and time, the local solidification time and determine the solidification interval of any point. The local solidification time is one of the input parameters for the cooperating model of chemical heterogeneity. This second model and its application on EUCOR samples prove that the applied method of measuring the chemical heterogeneity provides the detailed quantitative information on the material structure and makes it possible to analyze the solidification process. The analysis of this process entails statistical processing of the measurement results of the heterogeneity of the EUCOR components and performs the correlation of individual components during solidification. The verification of both numerical models was conducted on a real cast 350 x 200 x 400 mm block.

Korundo baddeleytický materiál, tuhnutí, teplotní pole, chemická heterogenita, numerické modely

Corundo baddeleyit material, solidification, temperature field, chemical heterogeneity, numerical models

2012

26.06.2012

VUT v Brně

Brno

978-80-214-4529-1

Sborník příspěvků mezinárodní konference Hydro/Termo (31. setkání kateder mechaniky tekutin a hydromechaniky)

1

213–216

4