Review article

For low-carbon 08, 10, 20, St3 and low-alloy steels 09G2S and 0KhSND, there have been developed optimal modes of thermal cyclic treatment in order to obtain final structures with a specified degree of dispersion typical for real welded metal structures. It has been established that the degree of dispersion of the structures obtained depends on the initial microstructure, chemical composition of the steels, and the number of cycles in thermal cyclic processing (TCP). The availability of a less coarse-grained initial structure, an increase in the degree of steel alloying and the number of cycles of the TCP contributes to the production of a finer-grained structure. It is shown that preliminary cold plastic deformation makes it possible to obtain the most fine-grained microstructure in the steels under study, the degree of dispersion of which increases with the degree of plastic deformation.