Identification of the working area of steel parameters 40Journal: Bulletin of Prydniprovs'ka State Academy of Civil Engineering and Architecture (Vol.2018, No. 5)
Publication Date: 2019-06-19
Authors : Fortyhin A. A;
Page : 75-82
Keywords : working area of parameters; steel 40; chemical composition; fractal dimension; mechanical properties;
Introduction. Determining the influence of the parameters of the technology of steel and iron production on their properties is a complex task. Its complexity is related to the multi-parameterity and multicriteria of such technology, where many factors influence the quality of the metal. A slight change in the parameters of the technology can lead to a significant change in the quality of the metal. Therefore, the study of the influence of technological factors on the quality of the metal in the working area of its parameters is an actual problem of material science. Materials and methods. Steel 40 was chosen as the material for the study. The influence of the chemical composition of the steel and the fractal dimension of the structural elements on its mechanical properties was investigated. Steel samples were investigated using optical microscopy to determine the fractal dimension of the structural elements. The fractal dimension of the structure was determined by the developed and patented methodology. Results of the experiment. As a result of experiments and calculations, the degree of influence of each element of the chemical composition on the mechanical properties of steel 40 within the working area of parameters: СMnSiРCrSNi was determined. The influence of the structure on the mechanical properties of steel 40 is confirmed by their sensitivity to the fractal dimension of structural elements. Conclusions. The influence of the chemical composition and steel structure 40 on its mechanical properties in the working area of the technology parameters is determined in the work. This approach allows us to assess the characteristics of the quality of steel grades of this class with a minimum cost of physical exam.
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