Abstract
In this study the main purpose was to provide “in situ” synthesis while flux cored arc welding (FCAW) for obtaining hardfacing with fine structure with uniformly distributed titanium borides and carbides in the Fe-Ti-B-C system. Also, Fe-Ti-Mo-B-C with equimolar content of Me/B4C was researched. Powders electrodes was manufactured with using of pure metal powders to provide “in situ” synthesis. Initial components were powders of Ti, Mo and B4C. It was investigated that the offered harfacings are characterized by high hardness and fine-grained structure. Addition of Ti to Fe-Mo-B-C system leads to elimination of the ferrite-boride eutectics, that exist in Fe-Mo-B-C. Also, the structure of hardfacing of Fe-Ti-Mo-B-C is characterized with absence of defects and pores that exist in case of using Fe-Ti-B-C hardfacing. Analysis was carried out using scanning electron microscopy (SEM) and electron backscatter diffraction (BSD). Hardness was measured by Rockwell method. According to the analysis of literature and experimental researches, a systems of powder electrode materials was manufactured by FCAW method with high content of hard borides and carbides. The obtained value of the hardness of Fe-Ti-B-C system is 67 HRC and for Fe-Ti-Mo-B-C system is 69 HRC.
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