Interfacial heat transfer of a single belt casting process.

摘要

Aluminum-magnesium alloys, used in sheet form, provide substantial strengthening with good ductility as a result of cold work, in addition to excellent corrosion resistance and weldability. In this thesis, the microstructures of Al-Mg alloy strips formed on a small scale simulator of a single belt caster was investigated. Heat transfer characteristics heat fluxes and heat transfer coefficients were also evaluated using thermocouple inserts and the IHCP (Inverse Heat Conduction Problem) method to deduce these values. This single belt casting is being developed as a new promising technology high productivity, in which liquid metal is cast from a dispenser system onto a moving belt that is cooled from below with water jets. In this process, the rate of heat transfer from the solidifying strip to the belt is one of the most important factors because the thermal history of the strip has a great influence on strip quality.; By measuring two temperature points under the moving substrate of different thermophysical properties, the values of heat flux and heat transfer coefficient were evaluated and microstructures were characterized quantitatively using the IHCP technique. With different substrate chemistry, correlations among liquid metal superheat, substrate velocity, substrate roughness, maximum heat flux, and grain size distributions were investigated.