Development of a methodology for studying the influence of technological factors of production on the quality of large ingots from stamped steel grades 5XHM and 56NiCrMoV7

Abstract

Currently, one of the main problems of metallurgical and machine-building production is the high proportion of defective metal, which is often associated with the formation of flocs in a steel ingot and increased metal contamination by non-metallic inclusions. One of the methods aimed at minimizing the amount of nonmetallic inclusions in deoxidized steel is the use of rare earth and alkaline earth metals as modifiers. The selection of the modifier must be carried out based on the chemical composition of the steel, as well as the technological features of production. In this regard, to assess the effectiveness of the influence of deoxidation and modification technology, it is necessary to develop a comprehensive research methodology that allows taking into account various technological factors of production in the conditions of variability of input parameters. This article presents an analysis of the quality of forgings made of steel grades 5XNM and 56NiCrMoV7, produced according to various technological schemes of deoxidation and modification, based on the use of a complex technique that includes metallographic analysis, X-ray spectral microanalysis, and thermodynamic modeling. Based on the results of the implementation of the method, a conclusion is made about the optimal technological scheme of deoxidation and modification