Investigation on Surface Hardening of Cast Iron by Tungsten Inert Gas Arc Remelting

To improve the resistance to abrasion for surface of cast iron,the wear resistibility of grey cast iron HT200 is increased by employing inert gas tungsten arc remelt and fast solidified.The effect of current and arc moving rate on the chilling layer microstructure and some properties are studied.The results are compared with those of spray coating by nickel alloys and cast iron chilled treating and it proved that rapid chilling of A type cast iron by tungsten inert shielded gas arc melting as an energy source is much better and cheaper technique than others.And also promises to provide a new method for controlling microstructure and properties.