首页|Composition of Non-Metallic Inclusions and Microstructure of Electric Arc Coating Formed Using the Flux-Cored Wire of Fe–C–Si–Mn–Cr–Mo System
Composition of Non-Metallic Inclusions and Microstructure of Electric Arc Coating Formed Using the Flux-Cored Wire of Fe–C–Si–Mn–Cr–Mo System
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Abstract The composition of the non-metallic inclusions and microstricture of the electric arc coating using the flux-cored wire of Fe–C–Di–Mn–Cr–Ni–Mo system has been studied. The electric arc coating has been formed with the help of the ASAW-1250 automatic arc welding machine using the investigated flux-cored wire. To reduce the level of contamination of the deposited metal with non-metallic oxide inclusions, aluminum gas purification dust was introduced into the flux-cored wire (instead of amorphous carbon). The composition of the electric arc coating was determined by using the XRF-1800 spectrometer. The microstructure of the electric arc coating has been studied by optical microscopy. The phase and elemental composition have been studied using scanning electron microscopy at the MIRA 3 LMH instrument. The non-metallic inclusions in the electric arc coating consist of oxides of silicon, fluorine, calcium, aluminum, and magnesiums. The darker component in the inclusion, which looks like rectilinear crystals directed from the surface deep into the inclusion, has a similar phase composition. However, the content of chemical elements in it is somewhat different. A small dark component with a rounded shape (aluminum and magnesium oxides) is observed in the inclusion. Traces of sulfur are distinct along the contour of the globules. Metallographic analysis of the deposited surface has shown that the microstructure of the deposited layer is a coarse-needle martensite. Its structure is uniform and has a dendritic (columnar) structure characteristic for cast metal. The results of the performed investigations allow elaborating the measures to reduce the content of non-metallic inclusions containing elements of fluorine, sodium and aluminum, which, in turn, may adversely affect the physical and mechanical properties of the deposited layer, for example, by using refining additives to reduce the contamination of the deposited layer with non-metallic inclusions.
Keywords: flux-cored wireelectric arc coatingcomposition of non-metallic inclusionsmicrostructurehardness
Kozyrev N. A.、Osetkovskii I. V.、Usol’tsev A. A.、Polevoi E. V.、Mikhno A. R.
NSTL
