| 2025 №06 (06) |
DOI of Article 10.37434/tpwj2025.06.07 |
2025 №06 (01) |
The Paton Welding Journal, 2025, #6, 46-50 pages
Influence of welding thermal cycles on the structure and hardness of the metal in the haz overheating area in welded joints of medium-carbon alloy steels of high hardness
V.D. Poznyakov, O.V. Korieniev
E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: pozniakovvd@ukr.netAbstract
During welding, two characteristic areas are formed in the heat-affected zone of welded joints of medium-carbon alloy steels with hardened (high-temperature area) and tempered (low-temperature area) metal. Since the metal of the high-temperature area of the HAZ is heated above the temperature Ac1 (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 supercooling. This paper presents data on the influence of welding thermal cycles on the structure and mechanical properties of the metal in the HAZ overheating area in welded joints of medium- carbon alloy steels of different chemical composition.
Keywords: medium-carbon alloy steels, high hardness, welding thermal cycle, metal structure, mechanical properties, welded joints
Received: 5.05.2025
Received in revised form: 05.06.2025
Accepted: 27.06.2025
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