Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Ramesh, M.R.Subject: search.filters.subject.Directional Solidification

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    Effect of Lateral Vibrations during Directional solidification on Mechanical Properties of Al-18%wt Si Alloys
    (Elsevier Ltd, 2018) Ramesh Babu, N.; Ramesh, M.R.; Kiran Aithal, S.; Kotresh, K.
    Experimental Investigation on the effect of mold vibration on the mechanical properties of Al-18%WtSi have been carried out using Taguchi Technique, as the molten metal at 750°C is poured in to the insulated mold which is subjected to lateral vibrations, directional solidification takes place due to the presence of chill at the bottom which gives rise to a functionally graded alloy. Due to the excitation, silicon present in the molten metal precipitates along its length. The castings are prepared with varying chill materials and chill volumes without vibrations and with a vibrating frequency of 50Hz. ANOVA was applied to optimize the process parameters. Hardness and Tensile test for the samples was carried out. Improvements in the properties can be attributed to the grain refinement of the casting prepared under vibrations. © 2017 Elsevier Ltd.
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    Study of dry sliding wear behavior of Al-Si-C FG alloy developed through directional solidification
    (American Institute of Physics Inc. subs@aip.org, 2019) Narayanappa, R.B.; Ramesh, M.R.; Kiran Aithal, K.A.; Shivakumar, V.K.; Manjunath, M.H.N.
    FGM is the materials in which the composition or micro structure or both are varied locally to attain a specific form of material properties from one position to the other extreme position. In this work Al-18wt% Si-2wt%C FG Alloy is processed through Directional solidification with base excitation. Molten metal when poured into the insulated mold, The copper chill which is placed at the bottom will extract heat so that solidification takes place linearly. When excitation is provided at the bottom the Silicon in the alloy will precipitate along the length of the specimen. Experimental investigation were carried out to study the wear behavior for the specimens processed with lateral vibrations and without lateral vibrations. © 2019 Author(s).
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    Study of tribological characteristics of Al-Si based directional solidified FGM with graphite end chill
    (American Institute of Physics Inc. claims@aip.org, 2020) Ramesh Babu, N.R.; Ramesh, M.R.; Murthy, R.N.; Sudheer Reddy, J.S.; Aithal, S.K.; Manjunath, H.N.
    The present work is to study the wear characteristics of graphite reinforced Al-Si based functionally Graded materials (FGMs). FGM were fabricated through directional solidification (DS) technique. To achieve this graphite chill were incorporated at the end of the mold. The accomplished FGM are explored for microstructure and tribological properties to study the significance of end chill. The microstructure is analysed using optical microscope, showed that the number of silicon particles present at the top portion is more when compared to the bottom portion. The tribological studies showed that top portion of FGM exhibited highest wear resistance in compared to the bottom portion. © 2020 Author(s).