Microstructural study of surface melted and chromium surface alloyed ductile iron

► Ductile iron was surface melted and chromium surface alloyed by tungsten inert gas process. ► Chromium surface alloying was carried out by pre-placing of ferrochromium powder. ► Microstructure and hardness of the surface melted and alloyed layers were studied. ► Hardness of the melted and alloyed layers reached to around 3.3 and 4.9 times of that of the base material, respectively.