PSI - Issue 40

N.B. Pugacheva et al. / Procedia Structural Integrity 40 (2022) 372–377 N.B. Pugacheva, T.M. Bykova / Structural Integrity Procedia 00 (2022) 000 – 000

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Fig. 3. Fractography of the fracture surface of Fe-Ni-Ti-C-B composite specimens after transverse bending tests: a - ductile fracture in the region “γ - Fe + TiC”; b - deep pits in the area "γ -Fe + TiC + TiB 2 "; c - honeycomb fracture of sections of the eutectic “γ -Fe + Fe 2 B” ; d - deformation of the axes of Fe 2 B dendrites in the eutectic. Conclusions In this work, it is shown that the presence of regions of the “ γ -Fe + Fe 2 B” eutectic in a monolithic SHS - composite of the Fe-Ni-T-C-B system has a plasticizing effect under mechanical loading. The eutectic “γ -Fe + Fe 2 B” is characterized by maximum plastic characteristics ( h max , φ , C IT ) during microindentation. In the course of transverse bending tests, the most favorable location of the dendrites of the Fe 2 B eutectic is perpendicular to the fracture surface. In this case, Fe 2 B boride has both a strengthening and a plasticizing effect on the fracture process, preventing the rapid growth of cracks. The maximum strength characteristics ( E *, R e , H IT / E *, H IT 3 / E * 2 ) correspond to the regions “γ - Fe + TiC” and “γ -Fe + TiB 2 + TiC”. Acknowledgements The work was carried out on the equipment of the Plastometriya Shared Use Center of the IMASH UB RAS in accordance with the state assignment on the topic No. AAAA-A18-118020790145-0. References Amosov A.P., Borovinskaya I.P, Merganov A.G., 2007. Poroshkovaya techniligiya samorasprostranyayshegosya visokotemperaturnogo sinteza materialov. In Mashinostroenie-1, Moscow, 472 pp. ISO 14577-2:2015, Metallic materials — Instrumented indentation test for hardness and materials parameters — Part 2: Verification and calibration of testing machines. Merganov A.G., 2000. Tverdoplamennoe gorenie / In. ISMAS Press, Chernogolovka, 224 pp. Nikolin Yu.V., Matevosiya M.B., Kochugov S.P., Pugacheva N.B. Patent na izobretenie № 2680489. Sposob izgotovleniya mnogosloinoi iznosostoikoi plastini. Prioritet ot 10.11.2017 d о 10.11.2037. Pugacheva N.B., Bykova T.M., Zamaraev L.M., 2020. The Effect of Atmosphere Composition on the Mechanism of Destruction of a Boride Coating on the Surface of a Die Steel during Thermal Cycling. Journal of Physics of Metals and Metallography 121, 590-596. Pugacheva N.B., Nikolin Yu.V., Malygina I. Yu., Trushina E.B., 2018. Formation of the structure of Fe-Ni-Ti-C-B composites under self propagating hightemperature synthesis/ In AIP Conference Proceedings, 2053, 020013. Pugacheva N.B., NikolinYu.V., Senaeva E.I., and Malygina I. Yu., 2019. Structure of Fe – Ni – Ti – C – B SHS Composites. Journal of Physics of Metals and Metallography 120, 1078 – 1084. Pugacheva N.B., Trushina E.D., Bykova T.M., 2014. Research on the tribological properties of iron borides as diffusion coatings. Journal of Friction and Wear 35, 489-496.