Numerical Modelling Of The Surface Cracking
Tendency In Solidifying Ceramic Materials
Author(s)
J. Dobrovská, F. Kavička, K. Stránský & B. Sekanina
Abstract
EUCOR is a ceramic material resistant to extreme heat and wear. A block made
of EUCOR with dimensions of 350 x 200 x 400 mm was used for the numerical
calculation and the experiment. The numerical model of the casting block
temperature field determines the temperature gradients, the solidification rate and
the local solidification time (i.e., the time between the liquidus and solidus
temperatures). The local solidification time significantly affects the forming of
the pouring structure of the given material and it makes one of the input
parameters for the second cooperating chemical heterogeneity model. This model
and its application on EUCOR samples prove that the applied measuring method
of the chemical heterogeneity provides detailed quantitative information on the
material structure and makes possible the analysis of the solidification process.
The analysis of this process entails statistical processing of results of the
heterogeneity measurements of the EUCOR components and it performs
correlation of individual components during the solidification. The model of the
chemical heterogeneity enables estimation of the structure parameters at any
critical point of castings. The combining of both models makes it possible to
estimate the structure parameter, which expresses the size of the crystallites in
the resultant material structure. It is a tool for the estimation of the tendency to
surface cracking and fracturing tendency at the critical point of casting made of
EUCOR.
Keywords: ceramic material, numerical model, solidification, local solidification
time, chemical heterogeneity, tendency to cracking.
Keywords
ceramic material, numerical model, solidification, local solidification
time, chemical heterogeneity, tendency to cracking
Related Book
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