Measuring Heat Transfer during Twin Roll Casting of Metals

[摘要] Accurate knowledge of the heat transfer coefficient during casting (between a moltenand/or semi-solid material and the mold) is critical to be able to develop representativemathematical models for casting process such as Twin Roll Casting (TRC). In this project, anexperimental apparatus was developed to enable to measurement of the interfacial heat transfercoefficient (HTC) at the interface between a liquid metal as it solidifies against a chill surface.The experimental apparatus consists of a cylinder and piston surrounded by a heater tomelt the metal samples. Pressure can be applied at the top of the piston so that the pressure of theliquid metal at the interface can be varied. The apparatus was instrumented with a number ofsensors so that the temperature in both the molten metal and chill surface could be monitored aswell as a force sensor so that the interfacial pressure and how it varies during solidification isknown. Using the measured temperature time history, the interfacial heat transfer was calculatedby using an inverse heat conduction method in conjunction with the known thermo-physicalproperties of the chill and solidifying metal. The apparatus was tested successfully by using Sn-7.5%Sb-3.5%Cu alloy as the casting metal solidifying against H13 tool steel chill block. Inaddition, the effect of different values of chill roughness and test metal superheat wereinvestigated on the heat transfer coefficient.

[发布机构] University of Waterloo

[关键词] Mechanical Engineering