Browsing by Author "Kiran Aithal, A.S."

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Effect of L/D ratio on Al-Si functionally graded material cast through centrifuge technique
(2011) Kiran Aithal, A.S.; Narendranath; Desai, V.; Mukunda, P.G.
Functionally Graded Material (FGM) is a class of material wherein the properties and structure are varied intentionally from one side to the other side of the specimen. This paper describes the effect of L/D (Length to Diameter) ratio of the cast on cast Al-Si FGM. The present study uses Al-17%wt Si to cast FGM's. The cast is evaluated for Microstructure and Hardness all along the length of the specimen. Three L/D ratios: 0.5, 1.0, 1.5 were cast using the Centrifuge Technique. The microstructures showed that enrichment of primary Si was largest in 1.5 ratio compared to other two. Hardness value of the cast at the upper and lower region were examined and found that gradient of hardness was more in 1.5 case. High volume percentage of primary Si was nearly 26% in the upper region and a hypoeutectic structure in the lower region. Â© (2011) Trans Tech Publications.
Effect of process parameters on centrifugally cast Al-Si FGM
(Springer International Publishing, 2016) Kiran Aithal, A.S.; Desai, V.; Narendranath, S.; Mukunda, P.G.
Functionally Graded Materials (FGM) are such kind of materials wherein the properties and structure are varied from one end of the cast to the other intentionally. Centrifuge technique has been used in this study to produce Al-Si FGMs. Several process parameters determine the microstructure and the distribution of phases in the FG casting. These parameters include the size and initial concentration of alloying element, the centrifugal force, solidification rate, cooling rate. In this work an attempt has been made to produce FGMs using three different process variables such as mold temperature, melt temperature and mold rotational speed, their effect on the structure and properties. For this study Al-17wt%Si is used. From the results it is seen that for a particular melt and mold temperatures by increasing the mold rotation speed enhances the segregation of the Si particles at the one end of the casting. Similarly increasing mold or melt temperature only, increases the segregation. Â© The Minerals, Metals & Materials Society 2016.
Evolution of microstructure and hardness of AL-SI functionally graded material cast through centrifuge technique using hypereutectic and eutectic Al-SI
(2011) Kiran Aithal, A.S.; Desai, V.; Narendranath; Mukunda, P.G.
Functionally Graded Materials (FGMs) are a new class of inhomogeneous materials wherein the composition and the microstructure is varied to alter the material property within a component. The present study is to fabricate a Functionally Graded Al-Si in-situ material and to characterize. Al-Si alloys with 17wt%Si (hyper eutectic) and 11.7wt%Si (eutectic) have been used to fabricate Al- Si FGMsby centrifuge casting process. The microstructural characteristics and hardness profiles of these FGMs have been evaluated. The study shows the structure of Al-Si samples produced by this method show Hyper eutectic through Eutectic to Hypo eutectic structure along their depth. It also reveals that hardness of the sample and the silicon content decrease steeply along the depth of the sample.
Experimental studies of flow patterns of different fluids in a partially filled rotating cylinder
(Isfahan University of Technology, 2009) Mukunda, P.G.; Rao, S.; Kiran Aithal, A.S.; Shrikantha, S.R.
An attempt has been made to investigate the various parameters affecting the fluid behaviour, partially filled in a rotating cylinder. When the cylinder is rotating at 'high' speed, a liquid forms a hollow cylinder. Different patterns are observed in the fluids for the rotatioal speeds below a critical speed. This study should give us some insight into molten metal behaviour during centrifugal casting. An extensive experimental investigation is required to obtain an appropriate functional relationship by knowing and understanding some dimensionless parameters. Here the effect of dimensionless parameters ? (which is 2 g/?2d, where g, ? and d denotes gravitational acceleration, container rotation rate and inner diameter of liquid cylinder) and G (number of times the gravity) was studied as variation of rotation speed, viscosity and aspect ratio of the mould.
Influence of teeming temperature of molten tin in centrifugal casting
(2010) Mukunda, P.G.; Shrikantha, S.R.; Rao, S.; Kiran Aithal, A.S.
During centrifugal casting, when a mould is rotated at very low and very high speeds, defects are found in the final castings. Obtaining the critical speed for sound castings should not be a matter of guess or based on experience. The defects in the casting are mainly due to the behaviour of the molten metal during teeming and solidification process. The studies of melt flow in partially filled rotating cylinders have indicated many features, which were not mentioned in the literatures of centrifugal casting. Motion of molten metal at various speeds and its effect during casting are addressed in this paper. Molten tin has been taken for the experiments, and its behaviour during various rotational speeds is explained. © 2010 W. S. Maney & Son Ltd.