Electrometallurgy Today, 2025, №02

2025 №02 (06)

DOI of Article 10.37434/sem2025.02.07

2025 №02 (01)

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"Suchasna Elektrometallurgiya" (Electrometallurgy Today), 2025, #2, 48-52 pages

Influence of thermal welding cycles on the structure and hardness of metal in the HAZ overheating section in welded joints on high hardness medium-carbon alloy steels

V.D. Poznyakov, O.V. Korenev

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: pozniakovvd@ukr.net

Abstract
During welding, two characteristic areas with hardened (high-temperature section) and tempered (low-temperature section) metal are formed in the heat-affected zone of welded joints of medium-carbon alloy steels. Since the metal of the high-temperature area of the HAZ is heated above Ac1 temperature (approximately 730 °C), the initial structure in it is transformed into austenite, which upon cooling decomposes with the formation of other structures, from ferritic to martensitic. Accordingly, the mechanical properties of the metal also change. The formation of a particular structure in the cooled metal depends on the chemical composition of the material and the degree of its overcooling. This paper presents data on the influence of thermal welding cycles on the structure and mechanical properties of the metal of the HAZ overheating section in welded joints of medium-carbon alloy steels of different chemical composition. 13 Ref., 4 Tabl., 2 Fig.
Keywords: medium-carbon alloy steels, high hardness, thermal welding cycle, metal structure, mechanical properties, welded joints

Received: 05.05.2025
Received in revised form: 08.05.2025
Accepted: 05.06.2025

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