Kalinin V. Scientific bases of progressive technologies of modifying and alloy cast irons for castings the metallurgical equipment

This work investigated technological processes of casting details for metallurgical equipment from modifying and complexalloy cast iron for purpose design theoretical bases of a choice and application complex ultradispersive modifiers (UDM) and establishment of mechanisms formation the structure and properties two-layer sheet-rollings. The methods: met-allographycal, electronmicroscopical, microrentgen analyses, mechanical and exploitation tests, mathematics planning of de-sign are used. First the complex criterions of effectiveness the modifiers in melt at differ phases of cast iron crystallization were opened and scientific based; the mechanisms an effect UDM on crystallization processes the original structure and graphitizing the modifying cast iron melts; the technologies of moulding sized details for metallurgical equipment by modify-ing and complexalloy cast iron with improved characteristics; the protective mechanism for ultradisherse modifiers from oxi-dizing by ladle were developed; this ensured the particls from 10 to 250nm the high adsorbed activity, kinetic and aggregate stability at the melt. Scientific representations about alloyage on technological parameters of casting are cre-ated the stability rollings at 14,7…38,7%. Theoretically and experimentally corroborated the regularity of reduc-tion in 1,5…2 times the quantity of cast iron for two-layer sheet-rollings. UDM-working allowed to raise ce-mentits microhardness in cast iron at 8…12%, austenite - at 18…26%, perlit - at 28…37%. The new cast iron compositions, processes of casting are developed and introduced into the metallurgical enterprises of Ukraine and Russia.