Development of Supercarburized Tappet Shim to Improve Fuel Economy

摘要

A newly developed surface hardening process, supercarburizing, has been developed for the application of tappet shim to improve fuel economy. Supercarburizing has been introduced to increase Resistance of wear and pitting performance and was Designed to have supersaturated carbon surface layer And further to have spheroidized carbide morphology. In This presentation, the process variables, such as surface Microstructure, morphology and distribution of carbide Precipitation, will be discussed via the results of friction Loss tests.