Étude du comportement post-coulée de réfractaires électrofondus à Très Haute Teneure en Zircone (THTZ)

Abstract : This work has been carried out in the frame of a French national research program on new refractories for glass production (NOREV) and focussed on the numerical simulation of the post-casting cooling of fused-cast refractories with a very high zirconia content (HZ). A numerical model of the cooling-down sequence of a tile has been developed from thermal measurements performed in a mould during a casting on industrial site. This calculation allowed the time positioning, for each location in the tile, of the physical phenomena occurring during cooling: solidification, creep and phase transformation of zirconia. Isothermal and non-isothermal mechanical tests allowed the constitutive equations of creep (isotropic hardening) and during zirconia transformation (Leblond transformation-induced viscoplasticity model). From the thermal loadings, the thermal stresses induced by cooling have been calculated, as well as the residual stresses remaining at room temperature. The phase transformation of zirconia, which induces a 4% volume swelling, seems to be the most critical physical phenomenon for both types of stresses. The performed parametric studies proved the interest of the numerical model as a tool for improving the process by varying different parameters: cast material properties, mould shape, properties of its constituents,...
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Submitted on : Monday, January 9, 2012 - 12:05:44 PM
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  • HAL Id : pastel-00657812, version 1

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Laetitia Petroni. Étude du comportement post-coulée de réfractaires électrofondus à Très Haute Teneure en Zircone (THTZ). Matériaux. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0046⟩. ⟨pastel-00657812⟩

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