Micromechanics applied to the thermal shock behavior of refractory ceramics

Schmitt, Nicolas; Burr, Alain; Berthaud, Yves; Poirier, Jacques

doi:10.1016/s0167-6636(02)00156-4

Cited by 45 publications

(32 citation statements)

References 4 publications

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“…[29] Even though the oxide-carbon refractory consists of a large number of different inclusions, the random distribution of these inclusions makes the material behave as an isotropic ZHIGANG medium in the global sense. Therefore, the multiphase GSCS can be applied to predict the global properties.…”

Section: Prediction Methodsmentioning

confidence: 99%

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Prediction of properties of Al2O3-C refractory based on microstructure by an improved generalized self-consistent scheme

Wang

Kong

et al. 2005

Metall Mater Trans B

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An improved generalized self-consistent scheme (GSCS), which has a simplified computation process, was proposed to predict the properties, based on microstructure, of multiphase materials. The results of the prediction of the elastic modulus, Poisson's ratio, coefficient of thermal expansion, and coefficient of thermal conductivity of an Al 2 O 3 -C refractory using a multiscale homogenization method with this improved GSCS agree with the experimental results. It is found that understanding the microstructure and choosing a suitable matrix for the prediction are very important for prediction accuracy.

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Section: Prediction Methodsmentioning

confidence: 99%

“…The mean local properties (elastic modulus (E), Poisson's ratio (), thermal-expansion coefficient (␣), and thermal-conductivity coefficient ()) of the different constituents and their volume fractions (C r ) are given in Table II. [29] M ϭ a NϪ1 iϭ1 …”

Section: Prediction Of the Thermoelastic Properties Of An Al 2 Omentioning

confidence: 99%

Prediction of properties of Al2O3-C refractory based on microstructure by an improved generalized self-consistent scheme

Wang

Kong

et al. 2005

Metall Mater Trans B

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“…The Schmitt's model offers a theoretical explanation for this phenomenon. 20) The degree to which the slag sticks to the temperature tube is mainly dependent on slag and tube material composition, as well as the micro-structure on the surface of the temperature tube. Temperature tubes are made of about 75% Al 2 O 3 , 20% graphite, and 5% carbonaceous binder; slag is mainly comprised of CaO, MgO, and SiO 2 , but at individual proportions that differ considerably across different steel-making plants.…”

Section: Slag Adhesion Principlementioning

confidence: 99%

Molten Steel Level Measurement Based on Temperature Attenuation Characteristic

Xie

2016

ISIJ Int.

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This paper proposes a molten steel level measuring method in a tundish. This method is based on the temperature attenuation characteristic of the temperature tube. Our previous work focused on the temperature distribution of the temperature tube which can be used for molten steel level measurement. In some continuous casters, sticky slag adheres to the tube, thus, blocking the temperature information on the tube. To avoid this problem of lacking true temperature, we analyzed the principle of adhesion and conclude that the adhesive slag thickness of the tube is influenced by whether that part of the tube contacts the slag or the molten steel prior to being lifted. Consequently, for detecting the adhesive slag thickness online with available pyrometer, a heat transfer model is established. Through analysis of the model, it was revealed that the thickness of the adhesive slag remarkably influences the measurable maximum curvature time of the temperature attenuation. In addition, this maximum curvature time is insensitive to other irrelevant factors such as initial temperature and ambient temperature. Therefore, the maximum curvature time of the temperature attenuation of the adhesive slag indirectly indicates the molten steel level. Finally, the experiments prove the feasibility and the sound accuracy of this method with the maximal error being 3 mm. This method is not only suited for the molten steel level measurement, but also applicable to other non-destructive measurement of coating layer thickness.

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“…Yoshikawa et al stated that there has been little stress analysis work done on multilayer SENs [5] and, in relation to design analysis, this continues to be the case. Schmitt et al used the case of the submerged entry nozzle to demonstrate the efficacy of applying a combined micromechanics/computational approach to prediction of the microstructural performance of the alumina/graphite material under conditions of thermal shock [6]. In a similar sense, Deng et al used finite element analysis of microstructure to develop a regime for inducing residual stresses during the SEN manufacturing process with the aim of reducing erosion of the component in service [7].…”

Section: Computational Analysis Of Refractory Componentsmentioning

confidence: 99%

Finite element analysis applied to redesign of submerged entry nozzles for steelmaking

Ewing

Hendry

Nash

2011

Proceedings of the Institution of Mechanical Engineers, Part L:

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This version is available at https://strathprints.strath.ac.uk/30854/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the AbstractThe production of steel by continuous casting is facilitated by the use of refractory hollow-ware components. A critical component in this process is the submerged entry nozzle (SEN). The normal operating conditions of the SEN are arduous, involving large temperature gradients and exposure to mechanical forces arising from the flow of molten steel; experimental development of the components is challenging in so hazardous an environment. The effects of the thermal stress conditions in relation to a well-tried design were therefore simulated using a finite element analysis approach. It was concluded from analyses that failures of the type being experienced are caused by the large temperature gradient within the nozzle. The analyses pointed towards a supported shoulder area of the nozzle being most vulnerable to failure and practical in-service experience confirmed this.As a direct consequence of the investigation, design modifications, incorporating changes to both the internal geometry and to the nature of the intermediate support material, were implemented, thereby substantially reducing the stresses within the Al 2 O 3 /graphite ceramic liner. Industrial trials of this modified design established that the component reliability would be significantly improved and the design has now been implemented in series production.

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Micromechanics applied to the thermal shock behavior of refractory ceramics

Cited by 45 publications

References 4 publications

Prediction of properties of Al2O3-C refractory based on microstructure by an improved generalized self-consistent scheme

Prediction of properties of Al2O3-C refractory based on microstructure by an improved generalized self-consistent scheme

Molten Steel Level Measurement Based on Temperature Attenuation Characteristic

Finite element analysis applied to redesign of submerged entry nozzles for steelmaking

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