Actual Problems in Machine Building 2017 Vol. 4 No. 3

Актуальные проблемы в машиностроении . Том 4. № 3. 2017 Материаловедение в машиностроении ____________________________________________________________________ 111 SURFACE HARDENING OF TITANIUM BY TiB AND TiC PARTICLES USING METHODS NON-VACUUM ELECTRON BEAM CLADDING Chuchkova L.V. , Graduate students, e-mail: L_Chuckova@bk.ru Belov A.S. , Student, e-mail: al_belov98@mail.ru Vasilieva V.S. , Student, e-mail: wera.wasiljewa@yandex.ru Novosibirsk State Technical University, 20 Prospect K. Marksa, Novosibirsk, 630073, Russian Federation Abstract Titanium and it’s alloys cannot be used in tribological applications due to low wear resistance. Promising way to expand the use of these alloys in that area is providing high strength and wear resistant coating by non-vacuum electron beam cladding. This paper focused on the study of coatings obtained by cladding with different electron beam current. Electron beam current changed from 27 to 30 mA, other technological parameters were fixed. During investigation, the following studies were conducted: optical microscopy, X-ray diffraction analysis, fixed and against loose abrasive particles friction tests, microhardness tests. X- ray diffraction analysis has shown that coatings contain of α-titanium (α'-titanium), titanium boride and titanium carbide phases. Optical microscopy has shown that coating is represented by titanium matrix reinforced by titanium boride and titanium carbide particles. Undissolved boron carbide particles where found near heat-affected zone. Depending on beam current coating thickness range from 1.2 to 1.6 mm. Maximum microhardness value (5900 MPa) for alloyed layers where achieved by electron beam current 27 mA. Wear resistance increased 1.85 and 2.5 times during fixed and against loose abrasive particles friction tests respectively in comparison to commercially pure titanium. Keywords Electron beam cladding; titanium; tribological properties; titanium boride; titanium carbide; microstructure