Microstructure of impurity phase inclusions in gray cast iron and their composition

Abstract

It is quite difficult to control the content of carbide-forming elements in the production of casting 'pressure plate' of gray pearlitic iron grade SCh25 (GOST 1412-85). Therefore, it is necessary to conduct research and analysis of foreign inclusions, the basis of which are 'uncontrolled' carbide formers. The analysis of the content of 'uncontrolled' carbide-forming elements on the formation of zones with an interdendritic distribution of graphite types D, E (ASTM A247) castings of a pressure plate is carried out. The elemental composition of impurity inclusions is determined. It has been established that 'uncontrolled' carbide-forming elements are represented in cast iron in complex carbide-nitride and sulfide-phosphide phases. A conclusion is drawn on the effect of carbide formers on the formation of areas with an interdendritic distribution of graphite. All types of these phases are concentrated to a greater extent within the zones of interdendritic distributions of lamellar graphite D and E. This indirectly confirms the influence of 'uncontrolled' carbide-forming elements on their formation. © Published under licence by IOP Publishing Ltd.