PSI - Issue 59

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Olexandr Ivanov et al. / Procedia Structural Integrity 59 (2024) 622–628 Olexandr Ivanov et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 4. Defects in structure (a) and fusion zone (b) of sample 4.

While sample 4 showed high wear resistance, defects that are presented in the structure and fusion zone (Fig. 4) could lead to material failure in long-term using as well as while welding. Considering the conducted research, the most perspective material for further research and for practical implementation is sample 4 electrodes. 4. Conclusion Present work showed researching of FCAW hardfacings with flux-cored electrodes based on the Fe-Ti-Mo-B-C system with different ration between Ti and Mo. Microstructures of sample 3 and 4 contains of strengthening phase Fe(Mo, B) 2 , which provides high hardness (64 HRC for sample 3 and 63 HRC for sample 4) and wear resistance. While in sample 3 Fe(Mo, B) 2 phase exist in uniformly distributed grains with geometrical parameters of same order, for sample 4 grains differs in size and geometry significant, which is result of lack TiC grains in the structure, working as modifiers for Fe(Mo, B) 2 formation. Comparative wear resistance test included working condition with fixed, non-fixed abrasive and impact-abrasive loads. For comparison, serial production electrodes were used. Hardfacings 3 and 4 show competitive wear resistance in condition of fixed and non-fixed abrasive and decent level of resistance in condition of impact-abrasive loads. However, sample 4 characterized with presence of defects both in structure and fusion zone, while investigation of hardfacing from sample 3 shows absence of defects, which makes it perspective material for practical implementation. Further research should be aimed on investigating materials with different ratio between initial components. Also, it is desirable, considering the experience of other scientists, to investigate materials with alloying system with one of the elements altered with another, such as Nb, V, Cr. Acknowledgement Analysis of XRD patterns was performed by Pavlo Prysyazhnyuk, PhD, Associate Professor, Ivano-Frankivsk National Technical University of Oil and Gas. References Bembenek, M., Prysyazhnyuk, P., Shihab, T., Machnik, R., Ivanov, O., Ropyak, L., 2022. Mictrostructure and wear characterization of the Fe Mo-B-C-based hardfacing alloys deposited by flux-cored arc welding. Materials 15(14). https://doi.org/10.3390/ma15145074 Buchanan, V.E., Shipway, P.H., McCartney, D.G., 2007. Microstructure and abrasive wear behavior of shielded metal arc welding hardfacing used in the sugarnace industry. Wear 263(1-6), 99-110. https://doi.org/10.1016/j.wear.2006.12.053 Hsieh, C-C., Chen, J-H., Huang, F-T., Wu, W., 2013. Sliding wear performance of Fe-, Ni- and Co-based hardfacing alloys for PTA cladding. International Journal of Materials Research 104(3), 293-300. https://doi.org/10.3139/146.110859 Ishi, K., Uchikoshi, T., Takada, K., 2023. Low-temperature sintering of Li1.3Al0.3Ti1.7(PO4)3 electrolytes enabled by cobalt surface modification followed by two-step sintering. Journal of the Ceramic Society of Japan 131 (7), 298-305. https://doi.org/10.2109/jcersj2.23059 Kumar, A., Vijayakumar, P., 2023. Comparison of weld built-up by FCAW and MIG welding on damaged low Cr-Mo alloy steel tube in boiler application. International Journal of Science and Research Archive 08(02), 492-505. https://doi.org/10.30574/ijsra.2023.8.2.0243