Metal Mould Interfacial Heat Transfer Coefficient Between Silicate Bonded Sand Mould and Al-Si Alloy-An Experimental Investigation
M. Venkata Ramana1, V. Vasudevarao2, S. Sundarrajan3 and M. Komaraiah4
1Vignan Institute of Technology and Science, Hyderabad, Andhra Pradesh, India.
ramlalith@rediffmail.com
2Sreenidhi Institute of Science and Technology, Hyderabad, Andhra Pradesh, India.
V_vasudevarao@yahoo.com
3DRDL, Hyderabad, Andhra Pradesh, India.
S_sundarrajan@hotmail.com
4Malla Reddy College of Engineering & Technology, Hyderabad, India.
nrnnrn@gmail.com
ABSTRACT
Present investigation is aimed at determination of transient metal mould interfacial heat transfer coefficients between a CO2 gas cured silicate bonded sand mould and Al-Si alloy. Thermal histories at various locations of mould and metal are recorded during solidification of alloy from pouring temperature to room temperature. As a function of time magnitude of gap formed between solidifying metal and mould is determined and in turn heat transfer coefficient between metal and mould is determined. It is observed that very high value of heat transfer coefficient is recorded in the initial periods of cooling and it rapidly decreases up to around 1000 seconds of cooling time and there after decreases slowly to a more or less constant value.
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