Structure and Phase Composition of 09G2S Steel Modified by Different Types of Welding

[摘要] The paper presents the transmission electron microscopy (TEM) investigations of the structure and phase composition of the type 09G2S weld steel modified by four types of welding, namely: electrode welding and electropercussive welding both with and without the introduction of artificial flaws. Artificial flows are aluminum pieces. TEM investigations are carried out within the heat-affected zone, i.e. between the deposited and base metal, at 0.5 mm distance to the former. Welding electrode of the type E50A is used for welding 09G2S steel specimens. It is shown how the type of welding affects the steel morphology, phase composition, defect structure and its parameters. After each type of welding, the dislocation structure is polarized. This, however, does not cause internal stresses which can destroy the specimen.

[发布机构] OOO 'Kuzbass Center for Welding and Control', 33/2, Lenin Str., Kemerovo; 650055, Russia^1;T.F. Gorbachev Kuzbass State Technical University, Vesennyaya Str., 28, Kemerovo; 650000, Russia^2;Tomsk State University of Architecture and Building, Solyanaya Sq., 2, Tomsk; 634003, Russia^3;Institute of Strength Physics and Materials Science, SB RAS, 8/2, Akademicheskii Ave., Tomsk; 634021, Russia^4;National Research Tomsk Polytechnic University, Lenin Ave., 30, Tomsk; 634050, Russia^5

[效力级别] 机械制造

[关键词] Artificial flaws;Base metals;Dislocation structures;Steel specimens;Weld steel