| 2025 №10 (02) |
DOI of Article 10.37434/tpwj2025.10.03 |
2025 №10 (04) |
The Paton Welding Journal, 2025, #10, 16-23 pages
Modern approaches to obtaining continuous cooling transformation diagrams for welding (Review)
V.V. Zhukov, V.A. Kostin, S.G. Hrygorenko, R.S. Gubatyuk
E.O. Paton Electric Welding Institute of the NASU. 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: zhukov.kyiv@gmail.comAbstract
The article presents a review of modern approaches to constructing CCT diagrams and special diagrams formed on the basis of the results of a dilatometric experiment for the analysis of structural-phase transformations in steels during cooling. The methodology of physical modeling of thermal cycles on Gleeble installations, as well as typical heating and cooling parameters, is considered. Special attention is paid to the influence of the cooling rate on the formation of the microstructure in the heat-affected zone of welded joints. Approaches using constant and variable (nonlinear) cooling modes are compared with an emphasis on their compliance with real welding conditions. The advantages of nonlinear thermal cycles for increasing the reliability of modeling and correctness of constructing CCT diagrams when assessing the weldability of steels are substantiated. alloys with variable thicknesses ranging from 45 to 65 mm while maintaining the same number of passes.
Keywords: physical modeling, phase transformations, microstructure, austenite, martensite, CCT and DCCT diagrams, Gleeble, welded joints
Received: 09.06.2025
Received in revised form: 08.08.2025
Accepted: 21.10.2025
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