Thermodynamic Modeling of the Phase Composition of Fe-Me-C-B System Coatings Materials to Increase Crack Resistance, Hardness, and Wear Resistance

The development of wear-resistant surfacing powder electrode materials for automatic and manual surfacing is an urgent task. Their use makes it possible to restore the working surfaces of parts and structures operating under intense impact and abrasion to improve their physical, mechanical, and operational properties. The thermodynamic modeling of a multicomponent system based on Fe-Me- C-B using the CALPHAD methodology was carried out in the range of component concentrations that are promising for the development of wear-resistant electrode materials and the formation of coatings from them during automated and manual surfacing. The main strengthening phases in such a system are TiC and a uniformly distributed Fe2MoB2 phase. It was found that with an increase in the Mo content, the number of these phases increases, which leads to the maximum hardness of the deposited layer (66 HRC). Compared to standard electrodes, the relative wear resistance under friction conditions on the loose abrasive is 1.7 times higher, and on the fixed abrasive - 1.3 times higher. The wear resistance of the pitman knives restored by the developed powder electrodes is 2.8 times higher than that of standard T-590 electrodes.