Automatic Welding, 2022, №03



2022 №03 (02)

DOI of Article 10.37434/as2022.03.03

2022 №03 (04)

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Avtomaticheskaya Svarka (Automatic Welding), #1, 2022, pp. 26-33

Features of microstructure of butt joints of hypereutectoid AREAL-136HE-X rail steel in flash-butt welding

V.I. Shvets¹, O.V. Didkovsky¹, Ye.V. Antipin¹, I.V. Zyakhor¹, L.M. Kapitanchuk¹, Wang Qichen²

¹E.O. Paton Electric Welding Institute of the NAS of Ukraine. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: office@paton.kiev.ua
²CIMC Offshore Engineering Institute Company Limited Yantai, Shandong, P.R. China. E-mail: qichen.wang@cimc-raffles.com

The microstructure and properties of butt-joints of rails from hypereutectoid Areal 136HE-X steel produced by the fl ashbutt welding technology were investigated. It was found that under thermal and deformation conditions of welding, carbon redistribution is accompanied by the formation of particles in the microstructure with carbon precipitation and a decrease in carbon content in the matrix. A number of particles grow in the direction of the butt and their highest concentration is observed in the near-contact layer. According to the distribution of hardness in the zone of a coarse grain, in contrast to the butts of hypoeutectoid rails, as compared to the base metal, the hardness is slightly reduced – HV 3900 MPa and HV 4000 MPa, respectively. This is caused by the absence of free carbides in the microstructure. The features of microstructure do not signifi cantly aff ect the results of tests on static bending and meet the requirements of domestic and European standards. 13 Ref., 2 Tabl., 9 Fig.
Ключові слова: fl ash-butt welding, hypereutectoid rail steels, carbon redistribution, hardness distribution, static bending


Received: 27.01.2022

References

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