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


(논문)연구논문

한국주조공학회지 (15권3호 291-297)

Mechanical Properties & Fracture Toughness of Austempered Gray Cast Iron(AGI) by Permanent Mould Casting

금형주조한 오스템퍼 회주철의 기계적성질 및 파괴인성

Young-Sang Yi*. Ha-Sung Lee**, Dong-Myeong Kang**

*Korea Academy of Industrial Technolgy, **Yu Han Technical College

Abstract

The mechanical properties and fracture toughness of permanent mold cast austempered gray cast iron(AGI) were compared to those of sand cast AGI. The iron was melted to eutectic composition in order to get better castability especially in permanent mold casting. Specimens prepared for tensile, impact and fracture toughness test were austenitized at 900℃ and austempered at 270℃ and 370℃ for 1 hour. The strength, impact and fracture toughness of permanent mold cast AGI were found to be superior to those of sand cast AGI. The maximum value of 836 MPA in tensile strength, was obtained at the austempering temperature of 270℃. But ductility of AGI was not improved by permanent mold casting.

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