ПОВЫШЕНИЕ МЕХАНИЧЕСКИХ СВОЙСТВ ЛИТОЙ ГРАФИТИЗИРОВАННОЙ СТАЛИ

I. V. Akimov

doi:10.15802/stp2015/46071

Authors

I. V. Akimov Dep. «Composite Materials and Technologies», Zaporizhzhia National Technical University, Zhukovskyi St., 64, Zaporizhzhia, Ukraine, 69063, tel. + 38 (061) 769 85 32, e-mail tmzntu@gmail.com, ORCID 0000-0001-6076-0149, Ukraine https://orcid.org/0000-0001-6076-0149

DOI:

https://doi.org/10.15802/stp2015/46071

Keywords:

graphitized steel, structure, mechanical properties, optimization of the composition

Abstract

Purpose. Due to the presence of many essential properties (low prime cost, high manufacturability and damping ability, heat conductivity, fluidity and others),the graphitized cast irons are widely applied for parts operating under the conditions of static and cyclic loads, wear at dry friction and aggressive media at elevated temperatures. At the same time because of significant content of the graphite phase in the structure, the cast irons possess relatively low mechanical properties. Thereby the attention is drawn to graphitized steels, the peculiarity of which consists in the presence of graphite inclusions in the structure, which appoints specific cast iron's properties to these materials. But unlike cast irons, the graphite content in them is in 2…3 times lower and it affects positively on mechanical and service properties indices. This work deals with the optimization of the composition of cast graphitized steel, which has high mechanical properties indices. Methodology. The experimental design technique was used in this work. Alloys prototypes were smelted and their mechanical properties were investigated on the basis of these techniques. Findings were exposed to regression processing, and the dependences of the alloys components influence on its properties were obtained. By means of graphical optimization the optimal composition of steel with high mechanical properties indices has been determined. Findings.Ithasbeenestablishedthat carbon and silicon have the most significant influence on the strength and cyclic endurance of graphitized steels. The chemical composition of the cast graphitized steel with high static and cyclic strength indices was suggested in this work. Originality. With the use of mathematical experimental design techniques the dependences describing the influence of carbon, silicon and copper on the static and cyclic strength indices were obtained. They allow optimizing compositions of graphitized steels. Practical value. Using the graphitized steels with optimized composition in mechanical engineering will allow expanding their application areas along with providing reliability and durability of the parts operating under the conditions of static and cyclic loads.

Author Biography

I. V. Akimov, Dep. «Composite Materials and Technologies», Zaporizhzhia National Technical University, Zhukovskyi St., 64, Zaporizhzhia, Ukraine, 69063, tel. + 38 (061) 769 85 32, e-mail tmzntu@gmail.com, ORCID 0000-0001-6076-0149

И. В. Акимов

References

Volchok I.P., Kolotilkin O.B., Uvarov S.A.Grafitizirovannaya stal [Graphitized steel]. Inventor’s CertificateUSSR, 1993, no. 4910094, 2 p.

Akimov I.V., Volchok I.P. Pidvyshchennia vysokotemperaturnoi vytryvalosti hrafityzovanykh stalei [Improving the high-temperature resistance of graphitized steels]. FIDES. Intern. Forum for the Development of Education and Science Proc. Norway, Lulu Press Inc. Publ., 2010. Р. 61.

Akimov I.V., Volchok I.P. Ustalostnoye razrusheniye grafitizirovannykh staley pri vysokikh chastotakh nagruzheniya [Fatigue failure of graphitized steels at high loading frequencies]. Stroitelstvovo, materialovedeniye, mashinostroeniye: sbornik nauchnykh trudov [Proc. of building, materials science, mechanical engineering].Dnepropetrovsk, Pridneprovskaya gosudarstvennaya akademiya stroitelstva i arkhitektury Publ., 2014, issue 74, pp. 66-71.

Bosov A.A., Artemchuk V.V. Matematychne modeliuvannia planuvannia eksperymentiv [Mathematical modeling of experiments planning]. Visnyk Dnipropetrovskoho natsionalnoho universytetu zaliznychnoho transportu imeni akademika V. Lazariana [Bulletin of Dnipropetrovsk National University of Railway Transport named after Academician V. Lazaryan], 2008, issue 25, pp. 118-121.

Vakulenko I.O. Vtoma metalevykh materialiv v konstruktsiiakh rukhomoho skladu [Fatigue of metallic materials in the construction of rolling stock]. Dnipropetrovsk, Makovetskyi Publ., 2012. 152 p.

Vakulenko I.O. Strukturnyi analiz v materialoznavstvi [Structural analysis in materials science]. Dnipropetrovsk, Makovetskyi Publ., 2010. 124 p.

Vakulenko I.A., Bolshakov V.I. Morfologiya struktury i deformatsionnoye uprochneniye stali [The morphology of the structure and strain hardening of steel].Dnepropetrovsk, Makovetskiy Publ., 2008. 196 p.

Zhurakovskiy V.M. Organizatsiya transformiruyemoy struktury i obespecheniye zadannykh svoystv grafitsoderzhashchey stali. Avtoreferat Diss. [Organization of transformed structure and ensuring the desired properties of steel graphite. Author`s abstract.]. Minsk, 1985. 40 p.

Kovshov V.N. Metodicheskiye ukazaniya k postanovke eksperimenta pri vypolnenii kursovykh nauchno-issledovatelskikh rabot [Methodical instructions for the experiment during the course of research works]. Dnipropetrovsk, Natsionalna metalurhichna akademiia Ukrainy Publ., 1999. 50 p.

Kolmykov V.I., Roslyakov I.N., Letova O.V. Osobennosti formirovaniya grafitsoderzhashchikh diffuzionnykh sloyev pri dvukhstupenchatoy nitrotsementatsii konstruktsionnykh staley [Features of formation of graphite-bearing diffusion layers in two-stage carbonitriding structural steels]. Tekhnologiya metallov – Metal Technology, 2008, no. 11, pp. 22-24.

Savchenko V.A. Termostoykost grafitizirovannoy stali [Heat resistance of graphitized steel]. Nauka ta prohres transportu. Visnyk Dnipropetrovskoho natsionalnoho universytetu zaliznychnoho transportu – Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2014, no. 52, pp. 95-100. doi: 10.15802/stp2014/27333.

Silman G.I., Kamynin V.V., Tarasov A.A. Vliyaniye medi na strukturoobrazovaniye v chugune [The effect of copper on the structure formation in cast iron]. Metallovedeniye i termicheskaya obrabotka metallov – Metallography and Heat Treatment of Metals, 2003, no. 7, pp. 15-20.

Skvortsov A.I., Agapova L.I. Magnitnyye i dempfiruyushchiye svoystva grafitizirovannykh staley posle izotermicheskoy zakalki [Magnetic and damping properties of graphitized steels after isothermal hardening]. Metallovedeniye i termicheskaya obrabotka metallov – Metallography and Heat Treatment of Metals, 1993, no. 5, pp. 9-10.

Poyda A.A., KhutoryanskiyN.M., Kononov V.Ye. Teplovozy. Mekhanicheskoye oborudovaniye. Ustroystvo i remont [The locomotives. The mechanical equipment. The device and repair].Moscow, Transport Publ., 1988. 320 p.

AkimovI., Byelikov S., Volchok I. Wear resistance of graphitized steels. Archives of Metallurgy and Materials, 2013, vol. 58, issue 3, pp. 813-816. doi: 10.2478/amm-2013-0077.

Bravo S.V., Yamamoto K., Miyahara H., Ogi K. Control of Carbides and Graphite in Cast Irons Type Alloy’s Microstructures for Hot Strip Mills. Journal of Metallurgy, 2012, vol. 2012, pp. 1-6. doi: 10.1155/2012/438659.

Katayama S., Tarui T., Toda M., Naito K.-I. Fine Graphite uniform dispersion steel excellent in gold Machinability, Cuttability and Hardenbility, and production method for the same. 1998. No. US19960700355.

Kawabata Y., Morita M., Togashi F. Graphite Precipitated hot-rolled Steel plate having workability and hardenability and method therefore. 1992. No. US19920822649.

Rounaghi S.A, Kiani-Rashid A. Microstructure evolution in hypereutectoid graphitic steel. Intern. Journal of Materials Research, 2011, vol. 102, issue 10, pp. 1242-1246. doi: 10.3139/146.110586.