Automatic Welding, 2022, №08



2022 №08 (03)

DOI of Article 10.37434/as2022.08.04

2022 №08 (05)

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Avtomaticheskaya Svarka (Automatic Welding), #8, 2022, pp. 29-34

Influence of the composition of charge components of flux-cored strips of C–Fe–Cr–Nb alloying system on chemical composition and structure of the deposited metal

O.P. Voronchuk, O.P. Zhudra, T.V. Kaida, O.V. Petrov, L.M. Kapitanchuk, I.L. Bogaichuk

E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua

It is common knowledge that wear resistance of the deposited chromium carbide layer, additionally alloyed by such carbide- forming elements, as molybdenum, niobium, etc., largely depends on the reinforcing phase characteristics, its concentration, and qualities of matrix alloy. Good performance of such alloys under the conditions of abrasive wear at up to 600 оС temperature, is achieved by adding niobium to the alloy composition. This work is a study of charge components of flux-cored strips of С–Fe–Cr–Nb alloying system on the deposited metal composition and properties. The methods of X-ray structural, metallographic and X-ray microprobe analysis of metal of 500Kh22B7 type deposited by flux-cored strips, revealed the dependence of concentrations, form, orientation, phase components and integral hardness of the deposited layer on the type of addition of the main carbide-forming element, namely chromium, to the charge and flux-cored strip cross-section. It was found that at addition of chromium carbide Cr3C2 to the flux-cored strip charge, carbide phase concentration in the deposited layer increases by 10 %. Complex carbides of (CrFe)7С3 system are predominatly present in the deposited metal for all the samples. Niobium forms individual carbide components of much smaller dimensions, compared to chromium carbide components. Optimal concentration of the carbide phase in the metal of 500Kh22B7 type deposited by flux-cored strip is achieved by addition of a carbide-forming element, namely chromium, to the electrode material charge, in the form of chromium carbide and ferrochromium. Flux-cored strip cross-section and surfacing modes practically do not affect the deposited layer properties. 11 Ref., 8 Tabl., 4 Fig.
Keywords: flux-cored strip, chromium carbide, ferrochromium, niobium, carbides, hardness, microstructure, matrix, concentration


Received: 14.06.2022

References

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