Numerical simulation of heat transfer in pressurized solidification of Magnesium alloy AM50
The complex and interrelated transport phenomena occurring in pressurized casting process makes the analysis of solidification mechanism very complicated. Currently the heat transfer measurements are rarely performed in squeeze casting. With different applied pressure levels, heat transfer rates and heat flow patterns tend to vary considerably in squeeze castings. In this study, a model incorporating the enthalpy method, based on finite difference and control-volume scheme, has been developed to simulate fluid flow in forced convection and heat transfer in pressurized solidification of a cylindrical squeeze casting of magnesium alloy AM50. Pressure-dependent heat transfer coefficients (HTC) between the molten metal and the steel die as well as non-equilibrium solidification temperatures were determined by experimental measurements. By applying the heat transfer coefficients (HTC) and solidification temperatures measured under the different pressure levels of 30, 60, and 90 MPa, the temperature distributions and the cooling behaviors of squeeze cast AM50 were simulated. The results show that the levels of applied pressures affect considerably the solidification and cooling behavior of squeeze casting of magnesium alloy AM50. The application of high pressures enhances heat transfer across casting/die interface, and consequently shortens solidification time and increases cooling rates. To verify numerical prediction, temperature measurements inside an experimental squeeze casting were conducted. Comparisons of the numerical results with the experimental measurements show close agreement.
Zhizhong Sun Henry Hu Alfred Yu
Dept.Of Mechanical, Automotive & Materials Engineering University of Windsor, 401 Sunset Ave., Windsor, Ontario N9B 3P4, Canada
国际会议
桂林
英文
1-12
2010-11-16（万方平台首次上网日期，不代表论文的发表时间）