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오스템퍼드 구상흑연주철의 파괴특성에 미치는 오스템퍼링 온도의 영향에 관한 연구
박준훈,강창룡,김창규 ( Jun Hoon Park,Chang Yong Kang,Chang Gyu Kim ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.2
N/A This study was performed to investigate the effect of austempering temperature on the mechanical properties and fracture characteristics of the ductile cast iron with Cu, Mo and Cu, Mo, Ni. The results obtained from this study are summarized as follows; Microstructures of Cu-Mo and Cu-Mo-Ni ductile cast iron by austempering were obtained low bainite with some martensite at 250℃, mixture structure of upper and low bainite obtained at 300℃ and upper bainite obtained at 350℃. Tensile, impact and fracture toughness properties were remarkably controlled by retained austenite. With increasing austempering temperature, tensile and yield strength, hardness decreased, while the elongation and impact absorption energy, fracture toughness increased. With adding Ni, tensile and yield strength increased and elongation, facture toughness and impact absorption energy decreased. Retained austenite increased with increasing austempering temperature and the fracture surface were shown mixture structure of fibrous and dimple.