Obrabotka Metallov 2020 Vol. 22 No. 4

OBRABOTKAMETALLOV Vol. 22 No. 4 2020 161 MATERIAL SCIENCE References 1. Voroshnin L.G., Mendeleeva O.L., Smetkin V.A. Teoriya i tekhnologiya khimiko-termicheskoi obrabotki [Theory and technology of chemical and heat treatment]. Moscow, Novoe znanie Publ., 2010. 304 p. 2. Kulka M. Current trends in boriding: Techniques . Cham, Switzerland, Springer, 2019. 282 p. 3. Atul S.C., Adalarasan R., Santhanakumar M. Study on slurry paste boronizing of 410 martensitic stainless steel using taguchi based desirability analysis (TDA). International Journal of Manufacturing, Materials, and Mechanical Engineering , 2015, no. 5, pp. 64–77. DOI: 10.4018/IJMMME.2015070104. Effect of Mechanical Activation of the Powder Mixture on the Structure and Properties of Boro-Aluminized Low-Carbon Steels Pavel Gulyashinov 1, a ,* , Undrakh Mishigdorzhiyn 2, b, c , Nikolay Ulakhanov 3, c 1 Baikal Institute of Nature Management of Siberian Branch of Russian Academy of Sciences, 6 Sakhyanovoy st., Ulan-Ude, 670047, Russian Federation 2 Institute of Physical Materials Science of Siberian Branch of Russian Academy of Sciences, 6 Sakhyanovoy st., Ulan-Ude, 670047, Russian Federation 3 East Siberia State University of Technology and Management, 40V Kluchevskaya st., Ulan-Ude, 670013, Russian Federation a https://orcid.org/0000-0001-6776-9314, gulpasha@mail.ru, b https://orcid.org/0000-0002-7863-9045, undrakh@ipms.bscnet.ru , c https://orcid.org/0000-0002-0635-4577, nulahanov@mail.ru Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science. 2020 vol. 22 no. 4 pp. 151–162 ISSN: 1994-6309 (print) / 2541-819X (online) DOI: 10.17212/1994-6309-2020-22.4-151-162 Obrabotka metallov - Metal Working and Material Science Journal homepage: http://journals.nstu.ru/obrabotka_metallov ARTICLE INFO Article history : Received: 03 September 2020 Revised: 11 September 2020 Accepted: 29 October 2020 Available online: 15 December 2020 Keywords : Thermal-chemical treatment (TCT) Mechanical activation Boro-aluminizing Boron carbide Aluminum Carbon steel Alloy steel Funding The research is supported by grant of the Russian Science Foundation (proj- ect № 19-79-10163). ABSTRACT Introduction. Boro-aluminizing is one of the most effective ways to improve the performance properties (corrosion resistance, heat and wear resistance) of low-carbon steels. Solid-phase methods of thermochemical treatment (TCT) are carried out from saturating mixtures based on powder materials. Preliminary mechanical activation of these powders is one of the ways to improve the properties of the resulting diffusion layer. The purpose of this work is to determine the effect of preliminary mechanical activation of the powder mixture on the structure and properties of the boro-aluminized layer on the surface of low-carbon steels. Methods: The paper considers the results of research on the preliminary mechanical activation of the saturating mixture in the TCT of low-carbon steels (for example, St3 and 3Kh2V8F) based on powdered boron and aluminum carbide. The results of experiments on preliminary mechanical activation of the saturating mixture are shown, and the dependence of the particle size of the initial mixture on the duration of mechanical activation is established. Samples of steels with a diffusion layer after TCT are obtained. It is found that the process temperature has a signi fi cant effect on the thickness of the layers obtained. With an increase in temperature from 950 ° C to 1050 ° C on St3 steel samples, the layer thickness increases from 120 to 150 μ m, on 3Kh2V8F steel samples – 105 and 140 μ m with a holding time of 2 h and 4 h, respectively. The microstructure of the obtained samples is investigated; dependence diagrams of the microhardness distribution on the depth of diffusion layers are shown. The distribution of Al over the depth of the resulting boro- aluminized layer is established. As additional studies, the saturation capacity of the mixture after a single application in the TCT process is studied. Results and discussions. The principal possibility of using mechanical activation in TCT to obtain diffusion layers with speci fi ed strength characteristics is established. An increase in the duration and temperature of TCT in mechanically activated mixtures leads to an increase in the aluminum content in the layer. For citation: Gulyashinov P.A., Mishigdorzhiyn U.L., Ulakhanov N.S. Effect of mechanical activation of the powder mixture on the structure and properties of boro-aluminized low-carbon steels. Obrabotka metallov (tekhnologiya, oborudovanie, instrumenty) = Metal Working and Material Science , 2020, vol. 22, no. 4, pp. 151–162. DOI: 10.17212/1994-6309-2020-22.4-151-162. (In Russian). ______ * Corresponding author Gulyashinov Pavel A. , Ph.D. (Engineering), Research associate Baikal Institute of Nature Management Siberian Branch of the Russian Academy of Sciences, 6 Sakhyanovoy str., 670047, Ulan-Ude, Russian Federation Tel.: +7 (3012) 43-36-76, e-mail: gulpasha@mail.ru