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Correlation of Tribological Properties with Microstructure and Mechanical Properties of Graphite Cast Irons Centrifugally Cast for Engine Liner

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Abstract

This is a study of the influence of centrifugal process on the graphite morphology, mechanical and wear properties on flake graphite iron (FGI), spheroidal graphite iron (SGI) and compacted graphite iron (CGI). Melts of hypereutectic and almost of identical composition with or without melt treatment were centrifugally cast. The microstructure, mechanical and wear properties of these specimens were studied. In the microstructure for FG iron it has been observed that the centrifugal process produces flake size range class 2–3 (range 160–320 μm) and graphite of flake type A by about 67.9 % (field %) and combined flakes of type B, C, D and E will be of 32.1 % (field %). While SGI has been observed to have 96.1 % nodules and 330.0 nodules per square millimeter. Similarly CGI has been seen to produce 52.0 % nodules and 113 nodules per square millimeter. SGI possess the highest tensile strength, rupture strain and hardness of 604 N/mm2, 6.1 %, 233 BHN respectively. Whereas FGI possess the least tensile strength, rupture strain and hardness of 303 N/mm2, 0.65 %, 185 BHN respectively among the irons. CGI has a tensile strength, rupture strain and hardness of 369 N/mm2, 1.2 % and 200 BHN respectively which lies in between those of FGI and SGI. During the wear test similar materials for both disk and pin combination show higher co-efficient of friction and wear rate than those for dissimilar material combinations. SGI disk and FGI pin combination show least wear. This combination would be ideally suited for engine liner and piston rings.

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Acknowledgments

The authors express their sincere thanks to Mr. D. S. Chandrashekar, Director, SHANTHALA Spherocast Pvt. Ltd, Mr Uday Kumar, Director, Shimoga Piston Rings Pvt. Ltd. and Mr Pruthviraj, Director, Prarthana Engineering Pvt. Ltd., for their support in the research work. Also thanks are due to Dr. N. R. Shetty, Director, NMIT and Dr. H. C. Nagaraj, Principal NMIT, for their constant encouragement during this work.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Nitte Meenakshi Institute of Technology, Yelahanka, Bangalore, 560 064, India

    H. S. Desai Gowda & P. G. Mukunda

  2. Department of Mechanical Engineering, National Institute of Technology Karnataka, Surathkal, Mangalore, 575 025, India

    Mervin A. Herbert

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  1. H. S. Desai Gowda
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  2. P. G. Mukunda
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  3. Mervin A. Herbert
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Correspondence to H. S. Desai Gowda.

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Desai Gowda, H.S., Mukunda, P.G. & Herbert, M.A. Correlation of Tribological Properties with Microstructure and Mechanical Properties of Graphite Cast Irons Centrifugally Cast for Engine Liner. Trans Indian Inst Met 67, 731–740 (2014). https://doi.org/10.1007/s12666-014-0395-6

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  • DOI: https://doi.org/10.1007/s12666-014-0395-6

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