PSI - Issue 36

Ihor Koval et al. / Procedia Structural Integrity 36 (2022) 51–58 Ihor Koval et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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5. Conclusions Studies of the structure formation process in alloys based on TiC-NbC-WC with Ni-Cr binder have revealed that the use of nano nickel as starting powder changes the morphology of carbide grains, the dispersion of the structure and the course of diffusion processes. It is shown that the amount of binder 10% (wt.) is insufficient for its uniform distribution, a carbide frame is formed in the alloy, which could result in decrease in mechanical properties. At a binder amount 24% (wt.), the structure of the alloys consists mainly of homogeneous carbide grains and a binder being a solid solution of titanium and chromium based on nickel with a small amount of niobium and tungsten. Comparison of alloys with fine and nano nickel revealed advantageous effect of nano nickel on the structure formation, because in the rim of alloys carbide grains with nano nickel the amount of all alloy components is less than those of fine sized, while in the binder – vice versa. In terms of obtaining the high mechanical properties, the recommended binder content is 18% (wt.) with 13.5% (wt.) of nano nickel, which is caused by the structure formation containing both homogeneous and inhomogeneous carbide grains, the binder being strengthened due to the diffusion of titanium, niobium and tungsten. References Bodrova, L., Kramar, H., Mul, O., Marynenko, S., Koval, I., 2014. Relationship Between the Structure and Properties of Polycarbide Based Hard Alloys with Nano-WC Addings, Euro PM 2014 Congress and Exhibition, Proceedings, 2014 Cermets-19_P3_EP140178. Bondarenko, V., Gnatenko, I., Matviichuk, O., Prokopiv, M., Zavolokin, V., 2017. Interaction research between the high-temperature WC crossing form and their microwave, Rock-cutting and metal-working tools – equipment and technology for their manufacture and use 20, 415-421. Brieseck, M., Gneis, B., Wagner, K., Wagner, S., Lengauer, W., 2010. 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