Papers by Keyword: ESTPHAD

Abstract: Using the ESTPHAD (Estimation of Phase Diagrams) method, the liquidus and solidus curves in the equilibrium phase diagram can be created by thermodynamic based equations. By these determined equations, the liquidus or solidus temperatures as a function of concentration can be calculated with the required precision. The main advantages of the ESTPHAD method are as follows: the parameters of functions can be calculated simply, it gives a precise result and the calculation time is short. This paper shows the reconstruction of the liquidus curves of the CaO-Al2O3 phase diagram (0-60 wt% Al2O3 range) by using the ESTPHAD method on the basis of the measured data. The divergences between the measured and calculated (ESTPHAD) data are less than the given measurement error (±10 K).

Abstract: Including detailed information of equilibrium phase diagrams (EPhD) is is one of the necessary features in phase transformation simulations. It is important for a simulation to provide a simple but accurate EPhD calculation method which is based on the knowledge of the phase boundary lines in the EPhDs as an mathematical function. A simple, fast and iteration free approximate calculation method has been developed earlier (ESTPHAD – Estimated Phase Diagrams). The input data may be either experimental values, or a data field calculated by CALPHAD, or digitized data from the graphical representation of measured and published EPhDs . By this method important parameters such as the beginning and ending temperatures of solidification or solid state transformations can be determined for each phase. The partition ratios as a function of the concentration can be calculated as well. In this study ESTPHAD is used to estimate the EPhD of binary Fe-Ni system.