Тhe element-phase composition and properties of the surface layers of carbide-tipped tools made of TK and WC-Co alloys

E.E. Bobylyov, A.G. Sokolov show affiliations and emails
Received 03 April 2017; Accepted 15 June 2017;
This paper is written in Russian
Citation: E.E. Bobylyov, A.G. Sokolov. Тhe element-phase composition and properties of the surface layers of carbide-tipped tools made of TK and WC-Co alloys. Lett. Mater., 2017, 7(3) 222-228
BibTex   https://doi.org/10.22226/2410-3535-2017-3-222-228

Abstract

A technology for the deposition of diffusion titanium coatings from liquid metal media on hard alloys of TK (WC+TiC+Co) and VK (WC+Co) systems is described. It is shown that the diffusion saturation of hard alloy tools of these types by titanium from the Pb-Bi-Li melt in a temperature range 1000-1100°С and subsequent heat treatment results in a seven-fold increase of the wear resistance of the tools due to the formation of a diffusion coating. The thickness of the coatings varies depending on the temperature and deposition time and ranges from 2.6 to 6 μm on TK alloys and from 2 to 5.4 μm on VK alloys. The coatings consist of two layers, the surface one and transition one. The results of elemental and metallographic analyses are presented. The microhardness of a coating on hard alloy T15K6 is about 30000 MPa and on the hard alloy WC-8Co is 25000 MPa. The high microhardness of the coatings is caused by their formation on the basis of titanium carbide TiC, while other elements are driven depthward the material to coat. It has been found that the elemental composition of the coatings depends on the composition of the hard alloy under coating. The concentration of titanium in the surface layer of the tool amounts 87.6 % for VK alloys and 93 % for TK alloys. The transition layer is characterized by approximately equal concentrations of titanium and tungsten (about 20 to 25 %) and a reduced microhardness. The diffusion coatings are characterized by a smooth change of the concentration of elements with depth and good adhesion to the base material.

References (11)

1. A. G. Sokolov, V. V. Iosifov, A. G. Shirtladze, The technologies of formation of the required mechanical and physical-chemical properties of surfaces (coating engineering): a textbook for students, masters and postgraduates of the direction «Design and technological ensuring of engineering industries». Krasnodar, «Publishing House - South». 2016. 212p. (in Russian) [А. Г. Соколов, В. В. Иосифов, А. Г. Схиртладзе, Технологии формирования требуемых механических и физико-химических свойств поверхности изделий (покрытия в машиностроении): учебное пособие для студентов, магистров и аспирантов направления «Конструкторско-технологическое обеспечение машиностроительных производств». Краснодар, Издательский Дом - Юг. 2016. 212с.].
2. S. N. Grigor’ev. The methods of increasing the life of cutting tools: textbook for students of technical colleges. M.: Mechanical Engineering. 2011. 368p. (in Russian) [С. Н. Григорьев, Методы повышения стойкости режущего инструмента: учебник для студентов втузов. - М.: Машиностроение. 2011. 368с.].
3. Sokolov A. G., Bobylyov, E. E. Obrabotka metallov. Metal working and material science. № 2 (71), p. 59 - 69. (2016) (in Russian) [Соколов А. Г., Бобылёв Э. Э. Обработка металлов (технология, оборудование, инструменты). № 2 (71), с. 59 - 69. (2016)].
4. Patent RF № 2451108, 20.05.2012. (in Russian) [Патент РФ № 2451108, 20.05.2012.].
5. Sokolov A. G., Artem’ev V. P. The increase of efficiency of the tool because of the methods of the diffusion metallization. Rostov-on-Don, SFEDU. 2006. 228 p. (in Russian) [Соколов А. Г., Артемьев В. П., Повышение работоспособности инструмента методами диффузионной металлизации. Ростов-на-Дону, СКНЦ ВШ. 2006. 228 с.].
6. Patent RF № 2521187, 27.06.2014. (in Russian) [Патент РФ № 2521187, 27.06.2014.].
7. Kiparisov S. S., Levinskij Ju. V., Petrov A. P. The titanium carbide: preparation, properties, application. M.: Metallurgy. 1987. 216 p. (in Russian) [Кипарисов С. С., Левинский Ю. В., Петров А. П. Карбид титана: получение, свойства, применение. М.: Металлургия. 1987. 216 с.].
8. Sokolov A. G. Razrabotka teoreticheskih i tehnologicheskih osnov povyshenija stojkosti rezhushhego i shtampovogo instrumenta za schet diffuzionnoj metallizacii iz sredy legkoplavkih zhidkometallicheskih rastvorov: Dissertacija na soiskanie stepeni doktora tehnicheskih nauk. Krasnodar. (2008) 369 c. (in Russian) [Соколов А. Г. Разработка теоретических и технологических основ повышения стойкости режущего и штампового инструмента за счет диффузионной металлизации из среды легкоплавких жидкометаллических растворов: Дисc. д-ра техн. наук. Краснодар. 2008. 369 с.].
9. Panov V. S., Chuvilin A. M. The technology and properties of sintered hard alloys and products from them. The textbook for high school. M: MISIS. 2001. 428p. (in Russian) [Панов В. С., Чувилин А. М. Технология и свойства спеченных твердых сплавов и изделий из них. Учебное пособие для вузов. М.: МИСИС. 2001. 428 с.].
10. Sokolov A. G., Bobylyov E. E. Materials of 17-th international scientific-practical conference «technologies of hardening, coating and repair: theory and practice». Saint-Petersburg. 2015. c. 446 - 451. (in Russian) [Соколов А. Г., Бобылёв Э. Э. Материалы 17-й международной научно-практической конференции «Технологии упрочнения, нанесения покрытий и ремонта: теория и практика». Санкт-Петербург. 2015. с. 446 - 451.].
11. Sokolov A. G., Bobyljov E. E., Aref’eva S. A. Journal perspektivnie materialy. № 12, p.45 - 51. (2016). (in Russian) [Соколов А. Г., Бобылёв Э. Э., Арефьева С. А. Перспективные материалы. № 12, p.45 - 51. (2016).].

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