Abstract
In the present study the coatings of the Fe-Mn-Si-V-C system, deposited using surfacing by flux-cored arc welding (FCAW) were investigated. Thermodynamic study of the Fe-Mn-Si-V-C alloying system were carried out using CALPHAD approach. Microstructure investigations were performed using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction analysis (XRD). Hardness measurements of the surfaced layers were performed in deformed and undeformed state using Rockwell technique as well as microhardness measurements. Dry sand/ rubber wheel abrasion tests were used to compare the proposed coatings with the serial ones. The results show that the structure of Fe-Mn-Si-V-C-based surfacing alloy consists of two major phases, namely austenite which forms large dendritic grains and VC0.88 carbide inclusions, allocated along austenite grain boundaries as well as in the grains central regions. Hardness values in deformed and undeformed state for different VC content are in the range of 30–35 HRC and 42–45 HRC, respectively. The abrasion resistance of the proposed surfacing is almost two times higher than serial high-manganese steel-based surfacing alloy (Lastec 22).
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