INFLUENCE OF ANTIMONY ON SECONDARY DENDRITE ARM SPACING OF PRIMARY AUSTENITE OF HYPOEUTECTIC GREY IRON

The directional solidification method was used to investigate the secondary dendrite arm spacing of primary austenite of hypoeutectic Fe-C-Si-Mn alloy with various antimony contents. It is found that secondary dendrite arm spacing of primary austenite decreases with the increase of antimony content when the antimony content is less than 0. 036%, When the antimony is larger than 0.036%, adding more antimony to alloy enlarges that spacing again.