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Mo-Cu 계 구상흑연주철의 오스템퍼링처리 시간에 따른 파괴특성
이원식,강인찬,박현구,백승호 대한금속재료학회(대한금속학회) 1991 대한금속·재료학회지 Vol.29 No.7
In this study we were examined the effects of austempering time on the fracture properties of Mo-Cu alloyed ADI(austempered ductile iron). All the specimens were austenitized at 900℃for 1.5hr and austempered at 320∼380℃ for various holding time of 0.25∼4hrs. In the microstructure of this specimens austempered for 0.25hr and 0.5hr at all austempering temperatures was shown untransformed austenite volume partially and it was embrittled by martensite transformation. The strenth of these ADI decreases with the increases of austempering temperature, but the fracture toughness increases. When austempering time at various austempering temperatures is 2∼3hr, the strength and fracture toughness was had best value. Also, it's ductility and fracture tohghness have been proportion with retained austenite volume and SEM fractography of high toughness ADI was showed the dimple and fibrous pattern.