| 2025 №10 (01) |
DOI of Article 10.37434/tpwj2025.10.02 |
2025 №10 (03) |
The Paton Welding Journal, 2025, #10, 12-15 pages
Mechanical properties of metal in areas of welded joints of medium-carbon alloy steels heated to temperatures from 350 to 800 °C
V.D. Poznyakov, O.V. Korieniev
E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: korenew@ukr.netAbstract
During welding, two characteristic areas are formed in the heat-affected zone (HAZ) of welded joints of medium-carbon alloy steels with hardened (located in the HAZ areas of overheating, normalization and partial recrystallization — high-temperature area) and tempered metal (located mainly in the HAZ areas of recrystallization and blue brittleness — low-temperature area). In welded joints made using manual arc and mechanized gas-shielded welding with small-diameter wires, the width of these areas can reach 2.5 and 8 mm, respectively. The influence of thermal cycles, characteristic for the high-temperature area of the HAZ, on the mechanical properties of the metal is well covered in technical literature. There is much less information on the influence of thermal cycles of welding on the mechanical properties of the low-temperature area of the HAZ. This paper presents the data on the course of the heating and cooling process of the HAZ metal of butt welded joints 12 mm thick, which were heated to temperatures of 780, 550 and 350 °C, and on the effect of such heating on the mechanical properties (hardness, strength, ductility, impact toughness) of medium-carbon alloy steels with different content of alloying elements. alloys with variable thicknesses ranging from 45 to 65 mm while maintaining the same number of passes.
Keywords: medium-carbon alloy steels, mechanical properties, thermal cycles, alloying elements
Received: 02.06.2025
Received in revised form: 01.10.2025
Accepted: 21.10.2025
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