Fesenko K. Modification of iron in the gating system for the production of double-layer cast

Work is devoted to development of technological process of simultaneous separate modifying of liquid cast iron in reactionary cameras of gating system of a casting mold for production of castings with a firm wear-resistant superficial working layer and a viscous shockproof basis. On the basis of the conducted theoretical and pilot researches effective additives for sferoidyzation and karbidostabilization modifying of cast iron in a casting mold on the basis of modifiers which provide the guaranteed receiving set structure and properties of cast iron in casting are chosen. The most perspective constructive and technological option of production of two-layer castings as separate modifying of cast iron in a casting mold is chosen. The method of computer modeling, and also natural experiments investigated features of new constructive and technological option of production of two-layer castings from white wear-resistant and shockproof high-strength iron by separate karbidostabilization and sferoidyzation modifying of initial cast iron of the eutectic structure in a casting mold. Influence of the key technological parameters of process is established: temperatures of filling of source cast iron, thickness of a dividing steel partition on process of receiving different structure and properties of two-layer castings. Technological processes of receiving two-layer industrial castings with a firm wear-resistant working surface from white cast iron and a viscous plastic basis from high-strength cast iron with spherical graphite, and also technological process of receiving castings of high-strength cast iron with spherical graphite are developed and tested in laboratory and working conditions.