Conference Papers

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    Effect of volume fraction and particle size of reinforcement on thermal analysis and heat transfer parameters of gravity die cast hypereutectic Al-22% SI alloy matrix composites
    (2006) Subramanya, P.K.; Hegde, S.; Prabhu, K.N.
    The properties of cast metal matrix composites are largely dependent on the solidification behaviour which is dictated by the thermophysical properties of the melt, mould and the interfacial heat transfer from the metal to the mould. In the present investigation the thermal analysis parameters and heat transfer aspects of hypereutectic aluminium alloy matrix composites were studied. As the vol% of SiC p increases the total solidification time decreases and the cooling rate increases. The morphology of the primary silicon was very much dependent on the presence of SiC p. The estimated peak heat flux for the composites are lower than matrix alloy melts solidified under similar conditions. The particle size has a negligible influence on the cooling behaviour. However, composite with finer particle size shows slightly higher peak heat flux.
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    Thermal analysis and microstructure of ZA8 alloy solidifying against chills
    (Springer India sanjiv.goswami@springer.co.in, 2012) Ramesh, G.; Prabhu, K.N.
    Thermal analysis during solidification of ZA8 alloy against copper, hot die steel and stainless steel chills instrumented with thermocouples was carried out in the present work. The investigation showed that the chill material and coating had a significant effect on the cooling curve of the casting. When casting was solidified against chills, the liquidus and eutectic start temperature of the casting remained nearly the same whereas eutectoid transformation occurred at a higher temperature. Cooling rate curve of the casting solidified against coated chill indicated that formation of solid shell and subsequent re-melting in the case of high thermal conductivity coated chill whereas in lower thermal conductivity coated chill, the re-melting of solid shell was absent. It was found that chilling during solidification causes the morphology of dendrites transform to nearly rounded shape with refinement of lamellar eutectic.
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    Thermal properties of maize fiber reinforced unsaturated polyester resin composites
    (2013) Saravana Bavan, B.D.; Mohan, K.G.C.
    Increase in demand for natural fiber composites are raising today because of more advantage when compared to traditional fiber composites. In the present work, natural fiber composite material is processed by vacuum assisted resin transfer molding technique and the fibers are maize stalk fibers with matrix of unsaturated polyester resin. With suitable catalyst and accelerator composite material is fabricated and thermal properties for the material is examined by thermal gravimetric analyzer, differential scanning calorimeter and the results are also compared with finite element method.
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    The effect of cooling rate and cerium melt treatment on thermal analysis parameters and microstructure of hypoeutectic Al-Si alloy
    (Minerals, Metals and Materials Society 184 Thorn Hill Road Warrendale PA 15086, 2015) Vijayan, V.; Prabhu, K.
    In the present investigation, pure cerium ingots were added to Al-8% Si alloy melt to study its effect on the microstructure and cooling curve parameters. The melt treated alloy was solidified against sand base, stainless steel, brass, and copper chills to study the effect of chilling. Ce treated alloys solidified against sand base resulted in refinement of the eutectic silicon along with the formation of Al-Si-Ce ternary intermetallic compound. Addition of Ce to alloys solidified against chills resulted in the complete modification of eutectic silicon. Thermal analysis results revealed that the nucleation temperatures of eutectic silicon decreased on addition of cerium to the chilled alloys due to the synergistic effect of chilling and cerium addition. The degree of modification achieved was higher due to the decrease in the formation of Ce intermetallics at higher cooling rates.
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    Assessment of latent heat and solid fraction of Al-22Si alloy using Newtonian and Fourier analysis techniques
    (Trans Tech Publications Ltd ttp@transtec.ch, 2015) Vijayan, V.; Prabhu, K.
    Computer aided cooling curve analysis (CACCA) is an online prediction tool for the determination of solidification characteristics of metals or alloys. The results of CACCA can be used to accurately determine latent heat and solid fraction needed for modeling of the solidification process. Newtonian and Fourier analysis techniques adopt a data base line fitting technique to the first derivative curve for calculation of the solid fraction and latent heat of solidification. This paper describes the theoretical and experimental procedures involved Newtonian and Fourier analysis techniques with reference to an Al-22% Si alloy. The correlations between the solid fraction and temperature/time for the alloy were determined. © (2015) Trans Tech Publications, Switzerland.