Automatic Welding, 2026, №01

2026 №01 (07)

DOI of Article 10.37434/as2026.01.01

2026 №01 (02)

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"Avtomatychne Zvaryuvannya" (Automatic Welding), #1, 2026, pp. 3-10

Modern approaches to obtaining thermokinetic transformation diagrams for welding and related technologies (Review)

V.V. Zhukov, V.A. Kostin, S.G. Grigorenko, R.S. Gubatyuk

E.O. Paton Electric Welding Institute of the NAS of Ukraine 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine. E-mail: zhukov.kyiv@gmail.com

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 the real welding conditions. The advantages of nonlinear thermal cycles for increasing the reliability of modeling and correctness of constructing the CCT-diagrams when assessing the weldability of steels are substantiated. 16 Ref., 8 Fig.
Keywords: physical modeling, phase transformations, microstructure, austenite, martensite, CCT and DCCT diagrams, Gleeble, welded joints


Received: 09.06.2025
Received in revised form: 27.11.2025
Accepted: 15.01.2025

References

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