Boron is known of the powerful pealrite stabilizing elements in cast irons. In this study, to improve the wear resistance of ductile cast iron, a small amount of phosphorus-boron complex additive was added. Five melts having different compositions of ...
Boron is known of the powerful pealrite stabilizing elements in cast irons. In this study, to improve the wear resistance of ductile cast iron, a small amount of phosphorus-boron complex additive was added. Five melts having different compositions of phosphorus and boron were tasted into Y-type CO₂mould and inspected thear microstructure, mechanical and thermal properties, respectively. The results obtained from this study are as follows ; 1. Although the wear resistance of ductile cast iron is raised with the addition of B and P, its effect are more remarkable when they areadded simultaneously. For this reason the recommended complex addition amount is in the range of 0.04%B and 0.4%P. 2. Although the hardness of the ductile cast iron is increased with the addition of B and P it`s machinability is improved if additive amount is not over 0.04%B and 0.4%P. 3. The value of thermal expansion coefficient of the ductile cast iron is decreased with the addition of B and P, and is lowest in heat 5(0.04%B and 0.4%P).