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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with 15 wt. % nano WC, which fractures are specified by a higher number of ductile fracture elements since the small nano WC particles have been dissolved in the binder, contributing to the strengthening of carbide-metal bonds and dispersion strengthening of the binder as a whole.

Fig. 5. Microfractographs of fractures in alloys with different content and dispersion of W: 5(a), 10(b), 15% (c) wt.% WC; 5(d), 10(e), 15% (f) wt.% nano WC, 18 wt.% Ni – Cr, ΔT = 800°C.

Alloys with different nano Ni contents demonstrate different crack propagation behavior. The different sizes and orientations of microcracks are shown in Fig. 6. As it is seen in Fig. 6d, under conditions of binder deficiency with a temperature gradient 800 °C, the crack values are maximum.

Fig. 6. Microfractographs of fractures in alloys with different nano Ni content: 7.5 (a,d), 13.5 (b, e), 18 wt.%. (c, f) ΔT = 600°C (a, b, c); 800 °C (d, e, f).