PSI - Issue 59

Lyudmyla Bodrova et al. / Procedia Structural Integrity 59 (2024) 731–738 L. Bodrova et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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5. Conclusions As a result of the carried out research, it was found that the addition of tungsten carbide and nickel nano additives into TiC-VC/NbC/WC-Ni-Cr alloys is advantageous for their thermal shock resistance. As compared with fine grained WC, the addition of 5 and 10 wt.% nano WC to the alloy results in 1.8…1.9 times increase of thermal shock resistance. The alloy with 15 wt.% nano WC withstands the maximum number of cycles (74 cycles) at temperature gradient ΔT=600°C. At temperature gradient ΔT=800°C , the thermal shock resistance is in 3.9...4.4 times higher than that of a similar alloy with fine grained WC. Here, a change in the fracture mode from brittle to more ductile, was observed testifying the increase in the number of ductile fracture elements. For all temperature gradients, the thermal shock resistance of alloys with nano Ni is in 1.5...4.2 times higher than that of fine grained Ni. The alloy with 18 wt. % nano Ni withstands the maximum number of cyclic loading (N=83) at ΔT=600°C, unlike alloys with fine -dispersed nickel, in which the opposite phenomena was demonstrated: a decrease in thermal shock resistance with an increase of binder content. This is caused by the dispersion strengthening of the binder with nano Ni due to the dissolution of carbides in it. In all the examined alloys with nano additives and at all the studied temperature gradients, it was found that nano Ni has a predominant effect on the thermal shock resistance of the alloys as compared with nano WC. References Bukhta, V., Koval, I., Obuh, Y., Bodrova, L., Rusyn, B., Kramar, H., 2020. Effect of the nano - WC on the microstructure parameters of TiC –VC– NiCr based hard alloys. In Euro PM2020 Congress and Exhibition. Code 177045. Chao, 2005. Microstructure and mechanical properties of ultrafine Ti (CN) - based cermets fabricated from nan o/submicron starting powders. 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