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Title: DRILLING INSERTS OF THE WC-Co-CrB2 SYSTEM WITH INCREASED MECHANICAL PROPERTIES
DRILLING INSERTS OF THE WC-Co-CrB2 SYSTEM WITH INCREASED MECHANICAL PROPERTIES

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B. Ratov; V. Mechnik; V. Kolodnitsky; A. Kuttybayev; A. Muzapparova
10.5593/sgem2021/1.1/s06.111
1314-2704
978-619-7603-20-0
English
21
1.1
• Prof. DSc. Oleksandr Trofymchuk, UKRAINE
• Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Oil and Gas Exploration
A comprehensive study of composites using traditional methods of testing mechanical
properties in combination with methods of digital optical and scanning atomic force
microscopy made it possible to establish stable correlations between the content of
chromium diboride CrB2 additive with an average grain size WC, microstructure
parameters, hardness, fracture toughness, ultimate strength at bending and compression.
The optimal ratios of the components of the WC–Co-CrB2 system have been
established, at which a finely dispersed structure is formed with a simultaneous
improvement in physical and mechanical properties. It is shown that the introduction of
CrB2 (in concentration CrB2 C = 4% (% by mass)) leads to a twofold increase in fracture
toughness (from KIc = 4.4 MPa • m1/2 to KIc = 9.8 MPa • m1/2) with a slight decrease
hardness (from H = 15.1 to 13.9 GPa), as well as to an increase in the ultimate strength
in bending (from ? = 2000 to 2500 MPa) and compression (from ? = 5300 to 6000
MPa) of sintered specimens. Creation of WC–Co- CrB2 composite materials with
enhanced mechanical properties is essential for optimizing the designs of drilling tools
for various technological purposes, increasing their reliability and improving
operational properties. The properties of the materials under consideration are
determined by the composition, structure, and morphology, which, in turn, depend on
the properties of their constituents, methods and technological modes of sintering.
1. Established that the particles of CrB2 powder in the initial state have an
irregular shape, their size varies from 2 to 8 ?m. During the briquetting process, the
CrB2 particles did not change their shape and size.
2. For composites WC – 6% Co (% by mass), a coarse-grained structure with an
average size of a carbide grain of 5.6 ?m is observed.
3. It is shown that the presence of CrB2 in the composition of the initial charge in
the required amount prevents the processes of Oswald ripening (absorption of small
grains by large grains) and acts as a growth inhibitor, providing a decrease in the grain
of tungsten carbide from 5.6 ?m to 3.4 ?m at a content of 10% ...
4. It is shown that the introduction of CrB2 (concentration = 4%) leads to a twofold
increase in fracture toughness (from KIc = 4.4 MPa • m1/2 to KIc = 9.8 MPa • m1/2) with a
slight decrease in hardness (from H = 15.1 to 13.9 GPa), as well as to an increase in the ultimate strength in bending (from ? = 2000 to 2500 MPa) and compression (from ? = 5300 to 6000 MPa) of sintered specimens. With a further increase in the content from 4 to 10% CrB2 in the composite, a gradual decrease in hardness and fracture toughness is observed.
Creation of WC – Co - CrB2 composite materials with improved mechanical and operational properties is essential for optimizing the designs of drilling tools for various technological purposes, increasing their reliability, energy saving, and improving operational properties.?
conference
https://www.sgem.org/index.php/jresearch-article?citekey=20216901909
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21st International Multidisciplinary Scientific GeoConference SGEM 2021
21st International Multidisciplinary Scientific GeoConference SGEM 2021, 16 - 22 August, 2021
Proceedings Paper
STEF92 Technology
SGEM International Multidisciplinary Scientific GeoConference
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci
617-626
16 - 22 August, 2021
website
cdrom
7838
composite; composition; concentration; structure; properties