DOI: https://doi.org/10.32515/2664-262X.2019.2(33).104-115

Research of Influence of Technological Parameters of Process of a Vacuum Nitriding of Aluminium Alloys is on Property of the Diffusive Ion Nitrided Layers

Anatoly Rutkovskіy, Sergiy Markovych,Sergiy Myhajlyta

About the Authors

Anatoly Rutkovskіy, Senior Researcher, Associate Professor, PhD in Technics (Candidate of Technics Sciences), National Academy of sciences of Ukraine G.S. Pisarenko institute for problems of strength

Sergiy Markovych, Associate Professor, PhD in Technics (Candidate of Technics Sciences), Central Ukrainian National Technical University, Kropivnitskiy, Ukraine

Sergiy Myhajlyta, post-graduate, Central Ukrainian National Technical University, Kropivnitskiy, Ukraine

Abstract

Growth of operating parameters of combustion engines causes the steady increase of working temperature of structural elements of engine, especially pistons. The perspective for the superficial strengthening of details auto of tractor combustion engines is consider the method of the ionic nitriding. At the same time important is a task of determination of conformities to the law of influence of technological parameters of process on property of the diffusive ion nitrided layers. For the effective analysis of mechanism of the phenomena and technological process control of strengthening of pistons which are made from aluminium alloys, it is necessary to find out intercommunication of factors, which determine motion of process, and their influence on property of the diffusive ion nitrided layers. The presence of this information will allow to promote durability and reliability of both coverages and details with coverages on the stage of their constructing. Research of influence of technological parameters of process of a vacuum nitriding of aluminium alloys is in-process conducted on mikrostructure, chemical composition, remaining tensions, mikrohardness and roughness of the diffusive ion nitrided layers. The method of leadthrough of researches is resulted. Mikro structural researches, namely a presence and distributing of alloying elements is for surfaces, were executed with the use of methods of raster electronic microscopy and x-ray photography mikro to the analysis. The size of remaining tensions was determined on curvature of the treated rectangular standard. Research mikro conducted hardness by a measuring device mikro to hardness of PMT-3, corner between against made 136 degrees the lyings verges of diamond pyramid at loading a 100 gramme. Found out education even after a thickness and distributing of alloying elements of superficial layer and to education in him of strengthening phases on the basis of Aln, a surface structure appears defect-free with the changed properties, diffusion of nitrogen which influences on phase composition takes a place, and in a final result on the microhardness of surface. Researches of microstructure rotined that with the increase of temperature of nitriding was increased thickness of the nitrided layer. The optimum value of temperature at which is arrived at maximal hardness makes 480°С, most values мікро observed hardness at pressure of 50 Mpa and will make gas 85%Ni2 + 15% Ar. At forming of heatcover diffusive іонноазотованих glowed there are tensions of clench in aluminium alloys. The maximal value of remaining tensions of узал=280 Mpa is observed not on-the-spot standard, but on the depth of about 7 мкм, here with growth of duration of satiation of superficial layer increased value and remaining tensions. However, such increase passes in the conditions of maximal temperatures 480 degrees for 180 minutes.

Keywords

vacuum nitriding, microstructure, chemical composition, tension, microhardness, roughness

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