Mechanics & Industry
Volume 18, Number 7, 2017
STANKIN: Innovative manufacturing methods, measurements and materials
|Number of page(s)||6|
|Published online||30 December 2017|
Phase composition and microstructure of WC–Co alloys obtained by selective laser melting
Moscow State University of Technology “STANKIN”,
1 Vadkovsky per.,
127055, Russian Federation
* e-mail: firstname.lastname@example.org
Accepted: 18 December 2017
Phase composition and microstructure of initial WC, BK8 (powder alloy 92 wt.% WC–8 wt.% Co), Co powders, ball-milled powders with four different compositions (1) 25 wt.% WC–75 wt.% Co, (2) 30 wt.% BK8–70 wt.% Co, (3) 50 wt.% WC–50 wt.% Co, (4) 94 wt.% WC–6 wt.% Co, and bulk alloys obtained by selective laser melting (SLM) from as-milled powders in as-melted state and after heat treatment were investigated by scanning electron microscopy and X-ray diffraction analysis. Initial and ball-milled powders consist of WC, hexagonal α-Co and face-centered cubic β-Co. The SLM leads to the formation of major new phases W3Co3C, W4Co2C and face-centered cubic β-Co-based solid solution. During the heat treatment, there occurs partial decomposition of the face-centered cubic β-Co-based solid solution with the formation of W2C and hexagonal α-Co solid solution. The microstructure of obtained bulk samples, in general, corresponds to the observed phase composition.
Key words: Selective laser melting / additive manufacturing / WC–Co alloys / X-ray diffraction analysis / phase composition / microstructure
© AFM, EDP Sciences 2017
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