Актуальные проблемы в машиностроении Том 4 №3 2017

Актуальные проблемы в машиностроении

. Том 4. № 3. 2017

Материаловедение

в машиностроении

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SURFACE HARDENING OF TITANIUM BY TiB AND TiC PARTICLES USING

METHODS NON-VACUUM ELECTRON BEAM CLADDING

Chuchkova L.V.

Graduate students, e-mail:

Belov A.S.

Student, e-mail:

Vasilieva V.S.

Student, e-mail:

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