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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (25권2호 95-101)

Effects of Si Content and Austempering Conditions on Properties of High Carbon Cast Steel

고탄소강의 특성에 미치는 규소 함량 및 오스템퍼링 조건의 영향

Won-Bae Kim, Myung-Sik Kim*, Jong-Chul Kim**, Ho-Sang Sohn, Byung-Joon Ye

Kyungpook National University, *Korea Powertrain Co, ** Hwashin Co.


This study has been carried out to investigate the microstructure of austempered high carbon cast steel with the variation of silicon and heat treatment conditions. The results show that an lower ausferritic structure is formed at the low austemepring temperature (250~300℃) and an upper ausferritic structure is formed at the high austemepring temperature (350~400℃). As an austempering temperature increased, the retained austenite volume fraction increased, however hardness decreased. Also, as a silicon content increased, the precipitation of cementite was suppressed, therefore 2nd reaction of autempering transformation was delayed.


High carbon steel, Austempering treatment, Silicon, Retained austenite