MODELING OF THE PROCESS INJECTION MAGNESIUM IN CAST IRON TO THE THROUGH THE LANCE OF A DIFFERENT CONSTRUCTION

Abstract

The experimental prerequisites for improving the process of out-of-furnace treatment of cast iron by blowing in dispersed magnesium are established.Using the methods of cold physical modeling, the mechanism for the processing of cast iron with dispersed magnesium, which is blown into the foundry ladle through submersible tuyeres of various designs, has been investigated and the places of the preferential reactions have been established.As a result of cold modeling of the process of injecting magnesium into cast iron through tuyeres of various designs, a qualitative characteristic of the hydrodynamics of a liquid bath is given and the feasibility of using a blowing tuyere with an evaporator to introduce the modifier into the ladle is proved.For blowing dispersed magnesium into the foundry ladle, a blower tuyere design with an evaporator closed at the bottom end was proposed, on the vertical walls of which 24 holes of small diameter were made and the feasibility of using this design was proved.In order to clarify the features of the iron processing mechanism with dispersed magnesium in the casting buckets, a high-temperature experiment was conducted using a specially designed multi-purpose installationBased on the conducted high-temperature experiments, the possibility of controlling the process of cast iron processing in a foundry ladle with the provision of a calm process when using a tuyere with a cylindrical closed evaporator with a heat transfer graphite wall is shown. heat transferred through the wall of the metal and adjustable injection into the volume of the last soo sponding amounts of magnesium and the gaseous mixture of argon.During the injection of dispersed magnesium into cast iron, with an interval of 1-4 minu-tes, metal samples were taken using a special device. Investigated the microstructure of samples, where there is the presence of inclusions of spherical graphite (up to 60 microns) in the form of individual clusters, especially in the central parts of the samples, which proves the possibility of obtaining high-strength nodular cast iron for the production of high quality castings.