Multifractal Analysis of Microstructures after Laser Treatment of Steels

Abstract:

The superficial microstructure, received by laser processing, is characterized by a high density of defects of a crystal structure and incompleteness of thermal phase and structural transformations. The degree of a neravnovesnost of such a structure can be estimated by means of multifractal ranges. As a measure for calculation of multifractals, it is possible to use any quantitative structural index, in particular, the area of microstructural objects, their perimeter and density of borders. The most informative is density of borders, which considers the area and perimeter of structural object. Microstructures of stainless steel 12kh18n10t in an initial state, after laser processing and a local laser alloying by hard-alloy powder from BK8 were investigated. Calculations of complex indicators of the structural organization of material, which showed, are executed on the basis of the multifratalnykh of ranges, that laser processing leads to, increase of orderliness and frequency. It indicates high degree of a neravnovesnost with which increase hardening increases.

• Periodical: Solid State Phenomena (Volume 299)
• Pages: 926-932
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.299.926
• Online since: January 2020
• Authors: Vladimir A. Kim, Boris Ya. Mokritskii, A.V. Morozova*
• Keywords: Fractal Dimension, Hardening, Laser Processing, Micro-Hardness, Microstructure, Multifractal Range

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