Modelling of High Temperature Mechanical Properties and Density Change of Steels during Solidification

摘要

A computer model has been created to calculate the high temperature mechanical properties and density change of steels during solidification. Such calculations were based on accurate thermodynamic description of the phase evolution, including changes in phase fraction and element concentration as a function of temperature and steel composition during the solidification process. The properties of each phase were firstly calculated based on its composition and temperature. Then the strength and density of the overall material were calculated via a mixture law. Results show that the calculated tensile strength and density values are in good agreement with experimental results in liquid, 5-ferrite, and γ-austenite single phase regions and mixed phase regions. The computer model is designed in such a way that all the calculations can be done automatically via a user friendly graphical interface when the alloy composition is given.