Estimation of mechanical properties of steel 15пс

Authors

  • D. A. Denysiuk Department of Materials Science and Material Processing, State Higher Education Institution“Prydniprovska State Academy of Civil Engineering and Architecture”, 24-a, Chernyshevskoho St., 49600, Dnipro

DOI:

https://doi.org/10.30838/J.PMHTM.2413.261218.36.563

Keywords:

steel, mechanical properties, chemical composition, structure, planning matrix, mathematical model,

Abstract

Abstract. Formulation of the problem. Predicting the mechanical properties of structural carbon steels is of great scientific and practical importance. Along with the physical-mechanical methods of evaluating the properties of steels, mathematical methods are being actively  implemented,  which  allows  to  save  money  and  time  for  conducting  cost  exams.  The  relevance  of  this  work  is  due  to  the difficulties that arise in assessing the accuracy of the prediction of real and model data. This is due to the multifactorial carbon steel manufacturing technology where even a slight change in the technology parameters can lead to a significant change in the quality criteria of  the  target  product.  The  paper  proposes  to  investigate the  influence  of  elements  of  chemical  composition  and  structure  on  the mechanical properties of structural steel 15пс using the methods of mathematical analysis. Method. Constructional steel 15пс (sheet thickness 14 mm according to ГОСТ 16523) was selected as the steel for the study. The technique of planning experiments at the levels of factors +1 and 1 is used to evaluate the mechanical properties of steel 15пс in the state of factory delivery on the basis of the analysis of the influence of elements ofchemical composition and structure. Results of the experiment. As a result of the implementation of the experiment  planning  matrix,  dependencies  were  obtained  describing  the  influence  of  the  elements  of  the  chemical  composition  and ferrite-pearlitic structure of the steel on the properties. The pairwise correlation coefficients of R2for predicting the tensile strength based on the effect of the elements of the chemical composition are 0,89, a relative elongation of 0,82. When forecasting mechanical properties based on the influence of ferrite-pearlite structure 0,77 and 0,75 respectively. The calculated Fisher and Cochran criteria confirm the adequacy  of  the  obtained  results  of  mathematical  modeling  of  properties. Conclusions. Using  the  experiment  planning matrix,  a mathematical model for estimating the mechanical properties of 15пс steel was constructed. Based on the analysis of the coefficients of the equations, histograms were obtained describing the influence of the elements of the chemical composition on the properties of the metal. This approach will allow, without additional funds, to predict the tensile strength and elongation of steel 15пс not only at the end of the  main technological cycle, but also in the process of production of rolled metal  within the standard technology and regulatory documents.

Author Biography

D. A. Denysiuk, Department of Materials Science and Material Processing, State Higher Education Institution“Prydniprovska State Academy of Civil Engineering and Architecture”, 24-a, Chernyshevskoho St., 49600, Dnipro

Master of Engineering

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Published

2018-12-26