Surface hardening of carbide tools based on tungsten carbide by concentrated energy flows
https://doi.org/10.17073/0368-0797-2021-12-870-876
Abstract
The article presents the results of surface hardening of tungstencarbide hard alloys carried out using concentrated energy flows. The VK6OM alloy with a thickness of 20 μm is applied to the hard alloy VK10KS by the method of electric spark treatment. In this case, a surface hardened layer consisting of W2C is obtained. The hardness of the resulting layer is 22,000 MPa and the friction coefficient is 0.23 (compared to the friction coefficient of the original hard alloy of 0.41); strong but insufficiently wearresistant base is preserved. In the work, a surface layer on a hard alloy VK10KS with a thickness of 40 μm and phase composition of TiC and W2C was obtained by the method of singlecomponent electroexplosive alloying with titanium. The nanohardness of this layer is 25,000 MPa and the friction coefficient is 0.14. A surface layer with thickness of 3 – 4 μm and phase composition of TiB2 , TiC, W2C was obtained on the hard alloy VK10KS by the method of multicomponent electroexplosive alloying with titanium and boron. The nanohardness of the hardened layer is 27,500 MPa and the friction coefficient is 0.10. Applying the technique of separate cathodes, an ionplasma TiN + ZrN coating (50 % Ti + 50 % Zr) with a thickness of 20 μm was applied to the surface of the VK10KS hard alloy. Nitrogen was used as the reaction gas. The nanohardness of the surface layer hardened in this way is 38,500 MPa and the friction coefficient of is 0.07. Ionplasma TiN + ZrN coating has good adhesion to the substrate. The use of the proposed methods of surface hardening of VK10KS hard alloy makes it possible to choose one of the hardening methods, based on operating conditions of the carbide tool, to extend its operational life, as well as to save scarce materials (tungsten and cobalt).
Keywords
surface treatment,
alloy,
microstructure,
nanohardness,
wear,
friction coefficient,
wear track,
phases
About the Authors
T. N. Oskolkova
Siberian State Industrial University
Russian Federation
Russian Federation
Tat’yana N. Oskolkova, Dr. Sci. (Eng.), Prof. of the Chair “Metal Forming and Metal Science. “EVRAZ ZSMK”
42 Kirova Str., Novokuznetsk, Kemerovo Region – Kuzbass 654007
A. M. Glezer
National University of Science and Technology “MISIS” (MISIS); I.P. Bardin Central Research Institute for Ferrous Metallurgy
Russian Federation
Russian Federation
Aleksandr M. Glezer, Dr. Sci. (Eng.), Prof., Chief Researcher; Director of the Scientific Center “Metal Science and Physics of Materials”
4 Leninskii Ave., Moscow 119049
23/9, bld. 2 Radio Str., Moscow 105005
A. S. Simachev
Siberian State Industrial University
Russian Federation
Russian Federation
Artem S. Simachev, Cand. Sci. (Eng.), Assist. Prof. of the Chair “Metal Forming and Metal Science. “EVRAZ ZSMK”
42 Kirova Str., Novokuznetsk, Kemerovo Region – Kuzbass 654007
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Review
For citations:
Oskolkova T.N., Glezer A.M., Simachev A.S. Surface hardening of carbide tools based on tungsten carbide by concentrated energy flows. Izvestiya. Ferrous Metallurgy. 2021;64(12):870-876. (In Russ.) https://doi.org/10.17073/0368-0797-2021-12-870-876
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