On Peculiarities of Influence of Chemical Composition on Formation of Structure and Properties of Alloyed Cast Irons in the As-Cast State

Abstract

We conducted a study of the structure, phase composition and wear resistance of iron-carbon alloys used and planned to be used in manufacture of hot deformation tools. As established, chromium-manganese cast iron with chromium content of 12.5…13.5% and manganese content of 15.0…16.0% is advisable to be used as a material, in particular, for piercing mandrels. As shown, reduction of expensive alloying elements (Cr, Ni) contained in chromium-manganese cast iron in comparison with traditional alloys such as 300Х32Н3ФЛ and 'nikorin' is performed due to the higher contents of Mn. It was found that the increase in wear resistance of chromium-manganese cast iron is due to the high microhardness of the matrix, austenite-carbide eutectic based on carbide type Me7C3 and, apparently, it is conditioned by deformation-phase transformations that can occur during abrasion wear.