Effect of Holding Time and Stirring Before Pouring on Microstructure and Properties of ZL102 Cast Alloy
The effect of holding time and stirring before pouring on the microstructure and properties of ZL102 cast alloy was investigated.The results show that: the morphology of primary Si is from large polygon or plate to small blocks or dendrites and that of eutectic Si is from large noodle or plate to fine noodles or fibers and short;the liquid of ZL102 alloy is more uniform and the dendrite matrix is refined.Brinell hardness of ZL102 cast alloy by directly pouring is the lowest in the all samples and that of sample poured by holding 2 min after stirring is the highest than the former by 17.5%.Wear resistance of ZL102 alloy sample by holding 3 min is the best.The wear resistance of samples poured by direct pouring,pouring and holding time after stirring are almost the same,which can improve a little of its wear.