Fractal modeling the mechanical properties of the metal surface after ion-plasma chrome plating

doi:10.15407/fm30.02.275

Cited by 7 publications

(3 citation statements)

References 57 publications

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“…The relationship between the structure and properties of materials is one of the main tasks of materials science, since the choice of metrics in the identification of the object of study plays an important role in the evaluation of structural elements with a complex geometric configuration [20; 21]. The incompleteness of the formal axiomatics that arises when assessing the structure of materials using Euclidean geometry can be compensated for by using various approaches: fractal analysis [22]; multifractal analysis [23], wavelet theory [24], estimation of the region of property compromise, etc.…”

Section: Analysis Of Publicationsmentioning

confidence: 99%

Study of the influence of the structure of rolled iron on its hardness

Hlushkova,

Volchuk,

Panamariova

2023

Bulletin of KhNAHU

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Problem. The influence of the structure of cast irons on their hardness was studied using multifractal analysis. The spectrum of statistical dimensions of the cast iron microstructure was calculated using the Renyi formula. Materials and methods. The hardness of chromium-nickel cast iron was determined at three points of the sample. Results of experiments. It was found that the pairwise correlation coefficients for predicting hardness by traditional structure characteristics (length, diameter, area) were R2 = 0.73...0.87. When assessing hardness indicators by multifractal characteristics, the correlation coefficients are 0.78...0.88 for the pearlite structure with flake graphite and 0.81...0.93 for the pearlite structure with spherical graphite. The sensitivity coefficients of the hardness indicators of СПХН-43 rolls to the information and correlation dimensions of carbides, as well as to the fractal and statistical D-100 dimensions of flake graphite were determined. The sensitivity of hardness indicators to the fractal and statistical D100 dimensions of carbides and to the fractal and correlation dimensions of flake graphite was determined for СПХНФ-47 rolls. Conclusions. Based on the results obtained, an approach to assessing the hardness of СПХН-43 and СПХНФ-47 rolls was developed, which includes: 1). Determination of the statistical dimension spectrum of the cast iron structure elements. 2). Determination of the sensitivity coefficients of hardness indicators to the spectrum of dimensions of structural elements. 3). Creation of a mathematical model for predicting the hardness of rolls. The considered approach can be interpreted as an alternative method for assessing the quality criteria of cast irons based on the analysis of their structure.

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Section: Analysis Of Publicationsmentioning

confidence: 99%

Study of the influence of the structure of rolled iron on its hardness

Hlushkova,

Volchuk,

Panamariova

2023

Bulletin of KhNAHU

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“…Before welding coatings, due attention should be paid to the preparation of the surfaces of machine parts [ 18 ]. According to the condition of filler material deposition, the three most popular surfacing techniques utilized today are as follows: solution state (sole gel, electrochemical deposition [ 19 , 20 ], chemical solution deposition), gaseous state (ion beam-assisted deposition (IBAD), chemical vapour deposition (CVD)), physical vapour deposition (PVD) [ 21 , 22 ] and molten or semi-molten state (arc welding, plasma technology [ 23 , 24 ], spraying [ [25] , [26] , [27] , [28] ] and laser/electron beam [ 29 , 30 ]. Another issue is the shaping properties of surface layers to improve the tribological characteristic and wear resistance by various surface engineering methods including heat treatment [ 31 , 32 ] and thermochemical treatment (oxidation [ 33 , 34 ], carburizing, boriding, nitriding [ 35 ]) etc.…”

Section: Introductionmentioning

confidence: 99%

Prediction of phase composition and mechanical properties Fe–Cr–C–B–Ti–Cu hardfacing alloys: Modeling and experimental Validations

Lozynskyi,

Trembach,

Hossain

et al. 2024

Heliyon

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“…The final microstructure and mechanical properties depend on the cooling conditions of the deposited metal [53,54] and heat input. These determines the wear resistance of the deposited metal to various types of wear [55][56][57][58][59]. An unstable arc would deteriorate weld appearances and increase the amount of imperfections [60].…”

Section: Introductionmentioning

confidence: 99%

Effect of Exothermic Additions in Core Filler on Arc Stability and Microstructure during Self-Shielded, Flux-Cored Arc Welding

Lozynskyi,

Trembach,

Katinas

et al. 2024

Crystals

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In the conditions of an energy crisis, an important issue is the increase in energy efficiency and productivity of welding and hardfacing processes. The article substantiates the perspective of using exothermic additives introduced into core filler for flux-cored wire arc welding processes as a relatively cheap additional heat source, reducing energy consumption when melting filler materials, and increasing the deposition rate. The mixture design (MD) was selected as the design method to optimize the average values of current and voltage, as well as arc stability parameters depending on core filler composition. This article studies the influence of the introduction of exothermic addition (EA), as well as the ratios CuO/C and CuO/Al on arc stability for the FCAW S process. Parameters characterizing arc stability were determined using an oscillograph, and from the obtained oscillograms, an analysis was conducted on arc voltage and welding current signals during flux-cored arc welding. It was determined that various methods can be used to evaluate arc stability, which can be divided into two groups: graphical (current and voltage cyclograms, box plots with frequency histograms, ellipse parameters plotted on current, and voltage cyclograms) and statistical (standard variation and coefficients of variation for welding current and arc voltage). In this paper, a comprehensive evaluation of arc stability depending on the composition of the cored wire filler was carried out. It was determined that the most stable current parameters were observed for the flux-cored wire electrode with an average exothermic addition content at the level of EA = 26.5–28.58 wt.% and a high carbon content (low values of CuO/C = 3.75). Conversely, the lowest values of arc stability (CV(U) and Std(U)) were observed during hardfacing with a flux-cored wire electrode with a high CuO/Al ratio ≥ 4.5 and a content of exothermic addition in the core filler below the average EA < 29 wt.%. Mathematical models of mean values, standard deviation, coefficient of variation for welding current, and arc voltage were developed. The results indicated that the response surface prediction models had good accuracy and prediction ability. The developed mathematical models showed that the ratio of oxidizing agent to reducing agent in the composition of exothermic addition (CuO/Al) had the greatest influence on the welding current and arc voltage characteristics under investigation. The percentage of exothermic mixture in the core filler (EA) only affected the average welding current (Iaw) and the average arc voltage (Uaw). The graphite content expressed through the CuO/C ratio had a significant impact on welding current parameters as well as the coefficient of variation of arc voltage (CV(U)). Two welding parameters were selected for optimization: the mean welding current (Iaw) and the standard deviation of arc voltage (Std(U)). The best arc stability when using exothermic addition CuO-Al in the core filler was observed at CuO/Al = 3.6–3.9, CuO/C = 3.5–4.26, and at an average EA content of 29–38 wt.%. The significant influence of the CuO/Al and CuO/C ratios on arc voltage parameters can also be explained by their impact on the elemental composition of the welding arc (copper, cupric oxide (CuO), and Al2O3). The more complete this reaction, the higher the amount of easily vaporized copper (Cu) in the arc plasma, enhancing arc stability. The influence of core filler composition on the microstructure of deposited metal of the Fe-Cr-Cu-Ti alloy system was investigated.

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Fractal modeling the mechanical properties of the metal surface after ion-plasma chrome plating

Cited by 7 publications

References 57 publications

Study of the influence of the structure of rolled iron on its hardness

Study of the influence of the structure of rolled iron on its hardness

Prediction of phase composition and mechanical properties Fe–Cr–C–B–Ti–Cu hardfacing alloys: Modeling and experimental Validations

Effect of Exothermic Additions in Core Filler on Arc Stability and Microstructure during Self-Shielded, Flux-Cored Arc Welding

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