SEM, 2021, #2, 47-53 pages
Structural criteria of strength and crack resistance of high-strength steels and their welded joints
E.O. Paton Electric Welding Institute of the NAS of Ukraine.
11 Kazymyr Malevych Str., Kyiv, 03150, Ukraine. E-mail: email@example.com
Regularities of formation of phase composition, grain, subgrain and dislocation structures at different technological
parameters of welding, interrelation of the structure with a set of properties: strength, fracture toughness, level of
localized strain and local internal stresses in the metal of high-strength steel welded joints were investigated. Welded
joints of high-strength steels, differing by their strength and purpose, namely low-carbon ferritic-bainitic and bainiticmartensitic;
high-carbon ferritic-pearlitic; and alloyed medium-carbon martensitic steels, were studied. Experimentalanalytical
procedure for evaluation of a complex of physico-mechanical properties of all the structure elements by
specific structural parameters was improved, and mathematical processing of the data was introduced. It allowed
classifying the cracking conditions with respect to a set of structural components, taking into account the dislocation
density and substructure features. Such an experimental-analytical approach to studying the regularities of metal
structure impact on its strength, fracture toughness, local internal stresses and localized strain allows evaluation both of
the local level of these values, depending on structural factors, and of the general tendency of the change in mechanical
properties and crack resistance. Ref. 14, Tabl. 1, Fig. 5.
high-strength steels; welded joints; phase composition; microstructure; dislocation density; fracture mode;
mechanical properties; crack resistance
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