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오스템퍼링 처리한 C/V 흑연 주철의 마모에 미치는 잔류 오스테나이트량의 영향에 관한 연구
주도재,김홍범,천병욱,최창옥 ( Do Jae Joo,Hong Beom Kim,Byung Wook Cheon,Chang Ock Choi ) 한국주조공학회 1998 한국주조공학회지 Vol.18 No.4
N/A C/V graphite iron has superior tensile strength, toughness and ductility than grey iron, and better castability than ductile iron. The retained austenite content of C/V graphite iron by austempering treatment affects on the mechanical properties such as ductility, hardness, wear properties and machinability. C/V graphite iron alloyed with Cu and Mo were carried out on the austenitizing at 900˚C for 1 hour, and the austempering at 240∼400˚C for 1 hr. And then the mechanical and wear properties of austempered C/V graphite iron have been investigated by the retained austenite content. In consequence, the retained austenite content was found to be 18.2% in austempering temperature at 240˚C, and was increased 39.2% at 400˚C. Tensile strength and hardness of austempered C/V graphite iron were decreased as the retained austenite content increased, but elongation was increased. The rolling wear loss were increased as the retained austenite content increased. The wear surface of as-cast became to be rough. The microstructure of austempered C/V graphite iron was became to be acicular ausferrite in austempering at 240˚C, and feathery ausferrite at 400˚C. (Received December 31, 1997)
오스템퍼드 구상흑연주철의 마멸 특성에 미치는 잔류 오스테나이트의 영향에 관한 연구
김홍범,주도재,최창옥 ( Hong Beom Kim,Do Jae Joo,Chang Ock Choi ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.6
N/A Austempered ductile irons(ADI) are characterized by their relatively high retained austenite content which has a significant effect on mechanical properties and performance, such as ductility, toughness, wear resistance and machinability. Austenitising treatment at 900℃ for 1∼2hours, and austempering treatment within the temperature range 240∼400℃ on ductile cast iron alloyed with Cu and Mo were carried out, and the effects of retained austenite content on the mechanical properties and wear resistance were investigated. In consequence, the amount of retained austenite was found to be 13.5% at the austempering temperature of 240℃, and was increased 28% at 400℃. Tensile strength and hardness of austempered ductile iron were decreased as the retained austenite content increased, but elongation was increased. The retained austenite content at the austenitising time of 2hours was more than at l hour. The amounts of rolling wear loss were increased as the retained austenite content increased, and the wear surface was become to be rough.