N. Saunders, Z. Guo, J. P. Schill, A. P. Miodownik, Sente Software Ltd., Guildford, United Kingdom
Process simulation requires reliable data for a wide variety of material properties, ranging from thermal conductivity to flow stress curves. Traditionally such data are gathered from experimentation, which has significant disadvantages in that not all of the required data is readily available and, in particular, measurement of high temperature properties is expensive. Therefore, it is highly desirable to develop computer models that can calculate all relevant material properties required by process simulation.
This presentation will describe the development of computer models that can provide many of the properties required by process simulation for multi-component commercial alloys. These models are integrated into the computer software package JMatPro, which can then be used to export datafiles directly to FE/FD based packages used for casting, forging and deformation simulation. The properties that are calculated are wide ranging, including Thermophysical and physical properties (from room temperature to the liquid state), such as density, thermal expansion coefficient, thermal conductivity, Young's/shear/bulk moduli, Poisson's ratio, viscosity, specific heat and enthalpy. Temperature and strain rate dependent mechanical properties up to the liquid state, including high temperature flow stress-strain curves. Physical and mechanical properties as a function of time, temperature and cooling rate including user-defined cooling profiles. The calculations are based on sound physical principles rather than purely statistical methods, thus many of the shortcomings of methods such as regression analysis have been avoided. Examples of calculated properties will be provided for steels, titanium and nickel-based superalloys, with extensive comparison made to experiment.
Process simulation requires reliable data for a wide variety of material properties, ranging from thermal conductivity to flow stress curves. Traditionally such data are gathered from experimentation, which has significant disadvantages in that not all of the required data is readily available and, in particular, measurement of high temperature properties is expensive. Therefore, it is highly desirable to develop computer models that can calculate all relevant material properties required by process simulation.
This presentation will describe the development of computer models that can provide many of the properties required by process simulation for multi-component commercial alloys. These models are integrated into the computer software package JMatPro, which can then be used to export datafiles directly to FE/FD based packages used for casting, forging and deformation simulation. The properties that are calculated are wide ranging, including
Thermophysical and physical properties (from room temperature to the liquid state), such as density, thermal expansion coefficient, thermal conductivity, Young's/shear/bulk moduli, Poisson's ratio, viscosity, specific heat and enthalpy.
Temperature and strain rate dependent mechanical properties up to the liquid state, including high temperature flow stress-strain curves.
Physical and mechanical properties as a function of time, temperature and cooling rate including user-defined cooling profiles.
The calculations are based on sound physical principles rather than purely statistical methods, thus many of the shortcomings of methods such as regression analysis have been avoided. Examples of calculated properties will be provided for steels, titanium and nickel-based superalloys, with extensive comparison made to experiment.
