Abstract
As part of moving towards a sustainable production of diesel engines for heavy vehicle applications, the ability to predict casting defects has become ever so important. In order to model the solidification process for cast components correctly, it is of essence to know how the material will actually behave. To produce sound castings, often of complex geometry, the industry relies on various simulation software for the prediction and avoidance of defects. Thermophysical properties, such as density, play an important part in these simulations.Previous measurements of how the volume of liquid grey iron changes with temperature has been made with a conventional dilatometer. Measurements have also been made in the austenitic range, then on iron-carbon-silicon alloys with a carbon content lower than 1.5 wt%. Based on these measurements the density variations during solidification were calculated. The scope for this paper is to model the volume changes during solidification with the control volume finite difference method, using data from the density measurements.
Highlights
Solidification of cast metals is to a large extent a question of heat transfer
The scope for this paper is to model the volume changes during solidification with the control volume finite difference method, using data from the density measurements
The volume has been calculated based on the data from the same two density measurements as in figure 2, 3 and 4
Summary
Solidification of cast metals is to a large extent a question of heat transfer. The software used in casting simulation is most often based on the heat transfer laws. These laws consist of heat balances and, within them, relations of the so called thermophysical properties. One such property is density, which plays an important part for the change of heat content per time unit. [1] data on liquid density variation of cast iron is scarce and quite widespread over time. Measurements of liquid density have been carried out with a number of different methods. Measurements of liquid density have been carried out with a number of different methods. [2] The measurement methods chosen in this work has been a conventional pushrod dilatometer from Netszch, used for 1D-measurements, and an instrument developed to measure the volume changes in all three directions
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