Model estimation of mechanical properties of medium carbon steel

Authors

  • O. R. Sizova Department of Materials Scienceand Materials Processing, State HigherEducation Establishment “Pridniprovsk State Academy of Civil Engineering and Architecture”, 24-а, Chernyshevskogo str., Dnipro, 49600, Ukraine
  • O. R. Zhyvytsia Department of Materials Scienceand Materials Processing, State HigherEducation Establishment “Pridniprovsk State Academy of Civil Engineering and Architecture”, 24-а, Chernyshevskogo str., Dnipro, 49600, Ukraine

DOI:

https://doi.org/10.30838/J.PMHTM.2413.230419.499.293

Keywords:

structure, mechanical properties, perlite, fractal dimension, heat treatment

Abstract

Introduction. A promising direction in the evaluation of the structure of materials is the use of fractal formalism. Its use  makes  it  possible  to  predict  some  properties  of  materials  on  the  basis  of  studying  the  effects  on  them  of  various  processing modes, which leads to a change in the fractal dimension of the elements of thestructure. In particular, the sensitivity of mechanical properties to the fractal dimension of the structure was found for low carbon steels and cast iron rolls. It was proposed to conduct a passive experiment, the purpose of which is to establish the correspondence between the mechanical properties of medium-carbon steel and the fractal dimension of the elements of its structure. Passive experiment.In the course of the experiment, a correspondence was established between the fractal dimension of perlite steel 115 and its hardness values HB, and yield strength Т. Indicators of hardness and strength of the investigated steel  increase with increasing fractal dimension of perlite from 1,680 to 1,917. Such  an approach can be used in predicting the strength indicators of medium carbon steels based on the analysis of the fractal dimension of perlite. The fractal dimension of the structure was determined using a technique that combines cellular and point methods, which increased the accuracy of its calculation. Conclusions. A fractal model for estimating the yield strength and hardness of steel 115 was obtained  on  the  basis  of  an  analysis  of  the  structure  of  perlite  after  various  heat  treatment  conditions.  The  results  indicate  the sensitivity of the mechanical properties with a change in the fractal dimension of the elements of the structure due to the action of heat treatment.

Author Biographies

O. R. Sizova, Department of Materials Scienceand Materials Processing, State HigherEducation Establishment “Pridniprovsk State Academy of Civil Engineering and Architecture”, 24-а, Chernyshevskogo str., Dnipro, 49600

bachelor

O. R. Zhyvytsia, Department of Materials Scienceand Materials Processing, State HigherEducation Establishment “Pridniprovsk State Academy of Civil Engineering and Architecture”, 24-а, Chernyshevskogo str., Dnipro, 49600

bachelor

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Published

2019-04-23

Issue

No. 2 (2019): Metal Science and Heat Treatment of Metals

Section

Technical science

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