pISSN : 1598-706X / eISSN : 2288-8381
한국주조공학회지 (13권2호 175-186)
Study on the Effect of Mo Addition and Casting Thickness on the Mechanical Properties of Thin Ductile Cast Iron
박육구상흑연주철에 있어서 Mo 첨가 및 주물두께의 영향에 관한 연구
Byeong-Woo Song*, Yang-Jin Choi**, Yong-Hwan Kim*, Yong-Jin Park*
*Hongik University, **Daejeon National University of Technology
In this study, the effect of Mo addition on the microstructure and mechanical properties of ductile cast iron have been investigated. The amounts of Mo and the thickness of specimen have been varied from 0 to 4.79wt% and 13mm, 10mm and 6mm, respectively. As the casting thickness decreases, the average size of spheroidal graphite is decreased and the hardness increases. By increasing the Mo content, the tensile strength of ferrite and pearlite matrix increases and shows maximum which is about 30~40% higher than ordinary ductile cast iron. After the maximum, adding more Mo results in gradual transformation of ferrite and pearlite to bainite and thus tensile strength decreases again. The elongation decreases continueously with Mo content. The addition of Mo about 0.5~1.0wt% improves the wear resistance and tensile strength of thin ductile cast iron.