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이영상,이하성,강동명 ( Young Sang Yi,Ha Sung Lee,Dong Myeong Kang ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.3
N/A 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 1hour. 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㎫ in tensile strength, was obtained at the austempering temperature of 270℃. But ductility of AGI was not improved by permanent mold casting.
강동명,이하성,이영상 한국산업안전학회 1996 한국안전학회지 Vol.11 No.1
The mechanical properties and fatigue crack growth rate fracture toughness of permanent mould cast austempered gray cast iron(AGI) were compared to those of sand cast AGI. Specimens prepared for tensile, impact and fatigue test were austenitized at 900℃ and austempered at 270℃, 320℃, 370℃ and 420℃ for 1 hour. The strength, impact and fatigue crack propagation behavior of permanent mold cast AGI were found to be superior to those of sand cast AGI. Maximum values in tensile strength, BHN, Charpy impact energy, were obtained at the austempering temperature of 270℃ Samely, the slowest fatigue crack growth rate was appeared at the austempering temperature of 270℃. But ductility of AGI was not improved by permanent mould casting.