유연 연료 종류에 따른 스테인리스강의 트라이볼로지 특성 연구 = Tribological Behavior of Stainless Steels for Different Flexible Fuel Types

다국어 초록 (Multilingual Abstract)

This study investigates the friction and wear behavior of two types of stainless steels (SUS304 and SUS440C) that are widely used in automotive engine fuel injection components, under alcohol-blended flexible fuel environments. The study examines the M15 (15% methanol and 85% gasoline) and E26 (26% ethanol and 74% gasoline) fuel blends, which are among the representative fuel compositions used in flexible fuel applications. Ball-on-disk friction and wear tests are conducted based on ASTM G99, with modifications to test parameters. The tests are performed using the two stainless steels as disk materials at 25oC and 60oC to evaluate the influence of the fuel composition on the tribological characteristics and wear behavior. The results show that, for both stainless steels, the M15 environment yields a progressively increasing friction coefficient and causes more severe wear compared with the E26 environment. Surface and depth-profile compositional analyses of wear tracks indicate the less favorable formation and stability of carbon-containing tribofilms in the M15 environment, which likely lead to the increasing friction coefficient and severe wear. These findings may serve as a fundamental reference for understanding the underlying causes of the increased wear observed in methanol-blended fuel environments compared with ethanol-blended fuel environments.