Microstructure Analysis of Inlet and Exhaust Valves used in LPG fueled Retrofitted Spark Ignition Engines
Journal Title: International Journal of Modern Engineering Research (IJMER) - Year 2015, Vol 5, Issue 2
Abstract
Mechanically operated poppet valves are used, both as inlet and exhaust, for most conventional automotive engines in passenger cars. These valves are subjected to high temperatures throughout their operating cycle. A valve originally designed for a gasoline engine, when used for an LPG fueled retrofitted engine, goes through considerable mechanical damage, corrosion, erosion, wear and tear. It also demonstrates significant changes in its microstructure. This investigation focused on microstructure analysis and quantitative metallography of such inlet and exhaust valves using Atomic force microscopy (AFM) technique. The surface morphology of the valve material was studied and AFM measurements were used for quantitative characterization of the structure as also to gain useful information about crystallographic orientation of individual grains, the formation of cracks, identification of potential crack initiation and fracture sites, etc. A comparative evaluation of microstructure of worn - out valves with new valves was also carried out
Authors and Affiliations
Ajay Pandey , R. K. Mandloi
Keywords
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