Automatic Welding, 2024, №03



2024 №03 (05)

DOI of Article 10.37434/as2024.03.06

2024 №03 (07)

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Avtomaticheskaya Svarka (Automatic Welding), #4, 2024, pp. 41-48

Peculiarities of fracture of welded joints of railway rails of oxygen-converter K76F steel

V.I. Shvets, I.V. Ziakhor, L.M. Kapitanchuk, O.V. Didkovsky, E.V. Antipin

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

The fracture surface of rail K76F steel after static bending tests of rail butt joints produced by flash-butt welding was studied. Butt joints of rails of individual batches were fractured on the base metal or heat-affected-zone. It is shown that in the regions of dark color and oval shape, the destruction of the iron oxide film takes place. The formation of films occurs as a result of flashing and spreading of iron oxide inclusions along the structural boundaries probably in the thermo-deformation conditions of the crimping shop at the stage of blooming production. The formation of clusters of iron oxides occurs during the crystallization of the residual melt in steel ingots with an insufficient degree of deoxidation. Oval regions of dark color on the surface of the fracture are evidence of an insufficient degree of deoxidation of rail steel and a factor of its quality reduction. Ref.12, Tabl.1, Fig. 10
Keywords: rail K76F steel, deoxidation, flash-butt welding, iron oxide

Received: 07.03.2024
Received in revised form: 09.04.2024
Accepted: 24.05.2024

References

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