Formation Mechanism Of Wear Resisting Surface Layer On Cast Iron Moulds By Direct Surface Alloying

Abstract

The resource-saving method of direct (oxide) surface alloying and modification of machine parts is developed. Industrial wastes and semi-processed products of related industries are used as alloying and modifying additives. Metals can be efficiently reduced by atomic hydrogen- and carbon-containing surface layer of mould and core, containing organic high molecular weight polymeric materials. The technology of direct surface alloying with vanadium cast iron castings is tested. It was investigated macro - and microcomposition of the formed chemical associations (non-metallic inclusions and other "secondary" phases) and peculiarities of formation of structure elements during pouring laboratory samples into metal moulds and dry sand moulds. It is shown that the gasketed rings from gray cast iron poured into a dry rod shape and subjected to direct surface alloying have quality surface in the absence of casting defects.