FEATURES OF THE STRUCTURE AND PROPERTIES OF ELECTRIC ARC COATING SYSTEMS Fe – C – Si – Mn – Cr – Ni – Mo – V DEPOSITED BY NEW FLUX-CORED WIRE

Using the methods of light and scanning electron microscopy, X-ray spectral microanalysis, determination of microhardness, the microstructure features of electric arc coatings deposited with flux-cored wire are revealed (wire composition 0.40 % C, 0.78 % Si, 1.04 % Mn, 1.61% Cr, 0.49% Ni, 0.51 % Mo, 0.65 % V, 0.001 % Co, 0.001 % W, 0.07 % Cu, 0.059 % S, 0.02 % P). It is shown that the structure of coatings metal base has a columnar structure of a coarse-needle martensite. In the structure of the layers, nonmetallic inclusions of a globular type of two dimensional groups with average sizes of 12 and 27 μm formed by aluminum, manganese and silicon oxides were revealed. Numerous small inclusions of sulfides of irregular globular shape with a diameter of 3 – 4 μm were observed on the sections. The thickness of the coatings is 3 mm, the depth of the thermal influence zone formed by mixing the surfacing material with the substrate material is 5 mm. The microhardness distribution reflects the two-layer structure of the modified surface, in the deposited layer the microhardness reaches 500 HV (50 HRC), in the zone of thermal influence – 300 HV (35 HRC).

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