Оптимізація хімічного складу жаростійкого сплаву для виготовлення нагрівальних елементів
Journal Title: Математичне моделювання - Year 2018, Vol 1, Issue 2
Abstract
OPTIMIZATION OF THE CHEMICAL COMPOSITION OF HEAT-RESISTANT ALLOY FOR PRODUCTION OF HEATING ELEMENTS Grechka O.V., Mishchenko V.G. Abstract The development of metallurgy, engineering and chemical industry is associated with the development and use of new alloys that operate at high temperatures for a long time. Fe-Cr-Al alloy combines high electro-physical and operational properties and is widely used for the manufacture of heating elements of electrical resistance furnaces. The increase of heat resistance and technological plasticity are the main trends in improving Fe-Cr-Al alloys. Solving these problems will increase the service life of electric furnaces and heating devices. The purpose of the research is to establish regularity of influence of alloying elements on the operational properties of iron-chromium-aluminum alloy. To establish the dependence of performance properties on the chemical composition of the Fe-Cr-Al alloy with titanium and zirconium, a regression analysis was applied using the least squares method. Heat resistance and technological cold plasticity are selected as the optimization parameters. The intervals of variation of factors are determined taking into account the a priori information on the effect of alloying elements on the structure and properties of heat-resistant alloys. As a result of the regression analysis, equations were obtained that describe the mathematical dependence of heat resistance and technological plasticity on the content of the alloying elements. To determine the chemical composition that provides optimal performance properties of the alloy three-dimensional graphical dependencies are built. Response surfaces are built using an application package (Mathcad 7+). The response surfaces, as well as their projections, provide a visual spatial image of the regression dependencies. In this case, it is possible to consider the joint influence of any two alloying elements for a fixed value of the remaining alloying elements. Based on the three-dimensional graphs, conclusions were drawn about the general effect of the alloying elements on heat resistance and technological plasticity. The regression equations expressing the dependence of the heat resistance and the technological ductility of Fe-Cr-Al alloys from their chemical composition by additional alloying with their titanium and zirconium is obtained. Regression equations are processed using an application package. The optimal chemical composition of Fe-Cr-Al alloy, mass%: С ≤ 0,05; N ≤ 0,02; Cr 19,50—22,80; Al 4,50—6,00; Mn 0,05—0,30; Si 0,10—0,30; Ti 0,05—0,20; Zr 0,05—0,20; Be 0,005—0,05; Ba 0,0005—0,0015; one or more elements from the group Ce, La, Pr, Nd 0,001—0,01; S ≤ 0,015; P ≤ 0,015 is determined. A patent of Ukraine for the developed chemical composition has been obtained. Further research may be related to specification of the model, the introduction of additional parameters, the expansion of the intervals of variation of factors. References [1] Mishchenko V.G., Lazechnyy I.N., Lyakishev V.Yu. (2010). Ekonomlegirovannye zharostoykie stali dlya nagrevateley termicheskikh pechey [Economically alloyd high-temperature steels for heat-treatment furnace heaters]. Novі materіali і tekhnologії v metalurgії ta mashinobuduvannі − New materials and technologies in metallurgy and mechanical engineering, 2, 63–68 [in Russian]. [2] Zhukov L.L., Plemyannikova I.M., Mironova M.N. and other. (1985). Splavy dlya nagrevateley [The alloys for heaters]. – Moscow: Metallurgiya [in Russian]. [3] Mogilatenko V., Fedorov G., Yamshinskiy M., Platonov E., Kuzmenko A., Nazarenko V. (2009). Povyishenie spetsialnyih svoystv zharostoykih hromoalyuminievyih staley mikrolegirovaniem i modifitsirovaniem [Improving the special properties of the heat-resistant Cr-Al steels by microalloing and modification]. Visnik DDMA – Herald DSEA, 1 (15), 220–225 [in Russian]. [4] Yamshinskiy M., Fedorov G., Platonov E., Radchenko K. (2014). Okalinostiykist hromoalyuminievih staley i rozrahunok parametrichnih diagram [Oxidation resistance Cr-Al steels and calculation of parametric diagrams]. Metall i lite Ukrainyi − Metal and casting of Ukraine, 1, 25–30 [in Ukrainian]. [5] Veres I., Fedorov G., Yamshinskiy M., Nazarenko V., Sobolyuk O. (2011). Kompleksnoe issledovanie vliyaniya ugleroda i titana na tehnologicheskie svoystva zharostoykih hromoalyuminievyih staley [Complex study of the effect of carbon and titanium on the technological properties of heat-resistant chromium-aluminum steels]. Metall i lite Ukrainyi − Metal and casting of Ukraine, 1, 29 – 32 [in Ukrainian]. [6] Kee Sun Lee, Kyu Hwan Oh, Hyung Yong Ra. (2000). Spontaneous deformation during the high temperature oxidation of Fe-20Cr-5Al-(0, 0,06) La alloy thin strip. Materials science and engineering, 278, 77−81. [7] Mishchenko V.G., Grechka А.V., Meniailo A.I. (2015). Vpliv leguvalnih elementIv na ekspluatatsIynI vlastivostI zharostIykih splavIv [Effect on operating alloying elements properties heat-resistant alloys]. Metallurgicheskaya i gornorudnaya promyishlennost −Metallurgical and Mining Industry, 7 (296), 87 – 91 [in Ukrainian]. [8] Pat. 112264 Ukraine. MPK C22C38. ZharostIykiy splav [Heat-resistant alloy] / MishchenkoV. G., Korolkov V. Yu., Grechka O. V. − filed 10.02.16 ; publ. 10.08.16.
Authors and Affiliations
О. В. Гречка, В. Г. Міщенко
Keywords
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- EP ID EP445052
- DOI 10.31319/2519-8106.2(39)2018.154249
- Views 106
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