구상흑연주철의 피절삭성과 내마모성에 미치는 Boron 첨가의 효과에 관한 연구 = A Study for the Effects of Boron Addition on Machinability and Wear Resistance of Ductile Cast Iron

다국어 초록 (Multilingual Abstract)

It is very important to obtain high performance ductile iron by addition a small amount of alloying elements. In this study, to improve the characteristics of small piston ring tasted from ductile iron melt a small amount of boron(0∼0.008wt.%) that is powerful carbide stabilizer was added in ductile iron, and inspected it`s effects on the microstructure, wear resistance, machinability and mechanical properties. The results obtained from this study are as follows. 1. As the amount of boron increased to 0.04wt.%, the machinability of ductile iron is increased, and if the amount is in excess of 0.04wt.% the machinability is decreased conversely. 2. The wear resistance of ductile iron is improved by boron addition. 3. The recommended ladle addition of boron amount ranges from 0.04wt.% to 0:06wt.% for the use of small piston ring.