Development Of Effect Austempered Ductile Iron And Property Evaluation With Addition Of Aluminium

Abstract

Many engineering applications in the present scenario are utilizing ferrous metals and its alloys, because of its better properties compared to its any other alloys or metals. Few metals like Titanium, Niobium, Vanadium etc exhibits better properties than ferrous metals even at higher temperatures, but cost of application is too high. Ductile iron is the ferrous metal which is used in railways, machine tools, machine members etc. This material has properties of both steel and cast iron. But the researchers found difficulties in using the ductile iron in place of steels due to lack of formability. The main objective of this work to increase the tensile strength and ductility with the addition of Al (commercially pure 99.97%) to the ductile iron which is followed by austempering. By considering the differences in melting point between the ductile iron [>1400ºC] and Al [660ºC] alloying may become difficult. The effort has been made to overcome the difficulties encountered during alloying by taking cost in to consideration. It is achieved by varying the composition of Al into ductile iron matrix and austempering is carried out on prepared specimen and effect of variation in austempering time and temperature on the tensile behaviour of the ADI specimen is discussed.