Application of the concept of multifractal to control the quality of low-alloy steel
DOI:
https://doi.org/10.30838/J.PMHTM.2413.250918.20.394Keywords:
structure, hardness, fractal dimension, multifractal, forecast, low alloy steelAbstract
Abstract. Relevance of the work. The quality control of manufactured metal products is carried out using both direct tests and non-destructive testing methods. It is proposedto use a multifractal approach in the analysis of the structure to predict the quality criteria for low-alloyed steel. Material and methods. Low-alloy steel with a ferritic-pearlitic structure was chosen as a material for research. Steel was subjected to heat treatment: heating to 920 °C and holding time for 300 sec. The samples were cooled to a temperature of 500 °C with different times. Results and discussion. The following parameters were used: the dimension of Hausdorff-Bezikovich D0, the homogeneity of fcalculated with the exponent q = –100 and 100, the coefficients of variation of the dimension of the elements of the structure with the most dense packing D-100and the most rarefied D100. The dependences of the multifractal characteristics of perlite and ferrite on the hardness and cooling time of the samples are established. There is a decrease in the hardness values of HV with an increase in the dimensional estimates of the structure of ferrite and pearlite, which is due to the increase in the cooling time of the metal to 500 °C from 29 to 93 000 sec. Conclusions.Based on the multifractal analysis of the ferritic-pearlitic structure of low-alloy steel, its hardness indicators were evaluated as a function of cooling time.
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