The Paton Welding Journal, 2022, №03



2022 №03 (03)

DOI of Article 10.37434/tpwj2022.03.04

2022 №03 (05)

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The Paton Welding Journal, 2022, #3, 34-40 pages

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

V.I. Shvets¹, O.V. Didkovskyi¹, 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 70 Zhifudao E Rd, Zhifu District, yantai, Shandong, 264012, p.R. China

Abstract
The microstructure and properties of butt joints of rails from hypereutectoid Areal 136HE-X steel produced by the flash- butt 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 grows 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 butt joints 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 significantly affect the results of tests on static bending and meet the requirements of domestic and European standards.
Keywords: flash-butt welding, hypereutectoid rail steels, carbon redistribution, hardness distribution, static bending

Received: 27.01.2022
Accepted: 16.05.2022

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