Obrabotka Metallov 2014 No. 4

ОБРАБОТКА МЕТАЛЛОВ № 4 (65) 2014 49 МАТЕРИАЛОВЕДЕНИЕ Refractory Metals and Hard Materials. – 2009. – Vol. 27, iss. 2. – P. 323–331. – doi: 10.1016/j.ijrmhm.2008.05.003. 20. Соболева Н.Н., Макаров А.В., Малыгина И.Ю. Упрочняющая фрикционная обработка NiCrBSi ла- зерного покрытия // Обработка металлов (технология, оборудование, инструменты). – 2013. – № 4 (61). – С. 79–85. 21. Dawei Z., Li T., Lei T.C. Laser cladding of Ni– Cr 3 C 2 /(Ni+Cr) composite coating // Surface and Coat- ings Technology. – 1988. – Vol. 110, 1-2. – P. 81–85. – doi: 10.1016/S0257-8972(98)00675-6. 22. Comparison of laser-clad and furnace-melted Ni- based alloy microstructures / Q. Li, D. Zhang, T. Lei, Ch. Chen, W. Chen // Surface and Coatings Technology. – 2001. – Vol. 137, iss. 2-3. – P. 122–135. – doi: 10.1016/ S0257-8972(00)007 32-5. 23. Structure of surface layers produced by non-vac- uum electron beam boriding / I.A. Bataev, A.A. Bataev, M.G. Golkovski, D.S. Krivizhenko, A.A. Losinskaya, O.G. Lenivtseva // Applied Surface Science. – 2013. – Vol. 284. – P. 472–481. – doi: 10.1016/j.apsusc. 2013.07.121. 24. Fatigue susceptibility under contact loading of hardmetals coated with ceramic films / L. Llanes, E. Tar- rés, G. Ramírez, C.A. Botero, E. Jiménez-Piqué // Proce- dia Engineering. – 2010. – Vol. 2, iss. 1. – P. 299–308. – doi: 10.1016/j.proeng. 2010.03.033. OBRABOTKAMETALLOV (METAL WORKING AND MATERIAL SCIENCE) N 4(65), October – December 2014, Pages 43–51 The contact endurance of NiCrBSi coatings obtained by gas powder laser cladding Savrai R.A., Ph.D. (Engineering), e-mail: ras@imach.uran.ru Makarov A.V., D.Sc. (Engineering), Senior Researcher, e-mail: avm@imp.uran.ru Soboleva N.N., Junior Researcher, e-mail: natashasoboleva@list.ru Malygina I.Yu., Ph.D. (Engineering), e-mail: malygina@imach.uran.ru Osintseva A.L., Ph.D. (Engineering), Senior Researcher, e-mail: osintseva@imach.uran.ru Institute of Engineering Science Ural Branch of RussianAcademy of Sciences, 34 Komsomolskaya str.,Yekaterinburg, 630049, Russian Federation Abstract The contact endurance of NiCrBSi coatings obtained by gas powder laser cladding of the powders with various chrome, carbon and boron content (PG-SR2, wt. %: 14.8 Сr – 2.1 В – 0.48 С; PG-10N-01, wt. %: 18.2 Cr – 3.3 В – 0.92 С) and TiC addition (PG-SR2 + 25 wt. % TiC) is investigated. The average microhardness was 520 HV for PG-SR coat- ing, 720 HV for PG-10N-01 coating and 770 HV for TiC – PG-SR2 coating. Tests on the contact fatigue are carried out using a servohydraulic testing machine (Instron 8801) circuit-wise pulsating non-impact contact «ball-plane» scheme with the load variation during a cycle according to a sinusoidal law. The maximum resistance to a contact impact during repetitive elastic-plastic deformation on mechanical non-impact contact loading is determined for PG-10N-01 coating with increased chrome, carbon and boron content in comparison with PG-SP2, the minimal one was for composite PG-SR2 coating with addition 25 wt. % TiC particles. The examination of the contact spots using scanning electron microscopy shows that the main fracture mechanism of every investigated coating under contact fatigue loading is cracking. Keywords: laser cladding, NiCrBSi coatings, TiC titanium carbide, structure, microhardness, contact fatigue. References 1. Grigor’yants A.G., Safonov A.N. Lazernaya tekhnika i tekhnologiya. Kn. 3: Metody poverkhnostnoi lazernoi obrabotki [Laser equipment and technology. Vol. 3: Methods of surface laser treatment]. Moscow, Vysshaya shkola Publ., 1987. 191 p.