Influence of deformation on the microelectrochemical heterogeneity of welded joints of 17G1SU steel

• Published in: Materials science (New York, N.Y.) Vol. 48; no. 2; pp. 147 - 152
• Main Authors: Khoma, M. S., Yavors’kyi, V. T., Dz’oba, Yu. V., Sysyn, H. M.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01-09-2012; Springer; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Corticosteroids; Materials Science; Solid Mechanics; Structural Materials; microelectrochemical heterogeneity; local potentials; deformation; welded joint
• ISSN: 1068-820X; 1573-885X
• DOI: 10.1007/s11003-012-9484-z

We study the microelectrochemical characteristics of 17G1SU pipe steel with. welded joints prepared with the help of a UONII-13/55R electrode under deformation. It is shown that the weld does not affect the microelectrochemical heterogeneity of the stress-free steel: Δ
E
= 20–80 mV. It is also demon strated that its value for steel increases by ∼10 mV in the zone of elastic deformations and by ∼40 mV in the zone of plastic deformations. In the region of concentrated plastic deformation, this quantity increases to ∼250 mV. The increase in the microelectrochemical heterogeneity of welded specimens is especially pronounced in the heat-affected zone: up to ∼130 mV within the range of elastic strains, up to ∼170 mV within the range of plastic strains, and up to ∼300 mV in the region of formation of a neck prior to fracture of the specimen.