A Study on the Wear Characteristics of Austempered Ductile Cast Iron in Corrosive Environments

J. Ocean Eng. Technol. 1988;2(2):87-95.

Kang Myug-Soon,Jun Tae-Ok,Park Heung-Sik,Jin Dong-Gyu

오스템퍼링한 구상점연주철의 부식환경중의 마멸특성에 관한 연구

강명순,전태옥,박흥식,진동규

한양대학교 정밀기계공학과,동아대학교 기계공학과,한양대학교 대학원,동아대학교 대학원

Keywords: Corrosive Wear Loss, Corrosive Wear Resistance, Critical Sliding Distance, Volume Fraction

핵심용어: 부식마멸량, 부식마멸저항, 임계미끄럼거리, 체적분율

Abstract

This paper is studied to know corrowive wear characteristics of austempered ductile cast ironin corrosive environments against mating SM45C hardened two test pieces in distilled water and NaCl aqueous solution. The corrosive wear mechanism was investigated by scanning electron microscopy and retained austenite volume fraction was investigated by X-ray diffractometer. The experimental result show that the corrosive wear characteristics depend largely on the $ extrm{Fe(OH)}_{3}$which is influenced by the critical sliding distance $L_{cr}$ and $L_{cr}$ shorted with increasing NaCl concentration. It was found that the carbides in matrix have a significant effect on their corrosive wear resisance and the fine acicular bainite showed corrosive wear resistance stronger than that of the coarse acicular and platelet bainite. From above results the model of corrosive wear mechanism in corrosive environments is proposed.