PSI - Issue 36

Olexandr Ivanov et al. / Procedia Structural Integrity 36 (2022) 223–230 Olexandr Ivanov et al. / Structural Integrity Procedia 00 (2021) 000 – 000

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Fig. 7. (a) SEM analysis of the microstructure of hardfaced layer; (b) X-ray diffraction analysis

Investigation of the fusion zone (Fig. 8) shows the absence of defects (such as pores, cracks, etc.) in this zone, which indicates of a strong connection of the coating with the base.

Fig. 8. Fusion zone of the experimental harfacing.

The average hardness of the hardfacing is 63 HRC for one layer hardfacing and 65 HRC for three layers hardfacing, the results of wear testing shown on the Fig. 9. As can be seen, the difference between the wear resistance of the coating made in one and three layers differs in a very small range, which indicates a large amount of electrode material in the first layer of surfacing.

Fig. 9. Relative wear resistance of the experimental electrodes: 1 – single layer under 250 A; 2 – single layer under 150 A; 3 – three layers under 150 A, 4 – three layers under 250 A. 4. Conclusion Hardfacing using FCAW welded under current of 150 A shows high abrasive wear resistance both in deposits made in one layer and in three layers. A significant amount of electrode material in the first deposited layer provides high values of hardness and wear resistance. The strong bonding in the fusion zone and the absence of defects, allow the usage of FCAW experimental electrodes for increasing the wear resistance of parts that works under the