The Morphology of Defects of a Weld Joints of a Drum with a Steam-Generator Housing of VVER-1000 Generator Units

• Published in: Protection of metals and physical chemistry of surfaces Vol. 53; no. 7; pp. 1235 - 1239
• Main Authors: Korneev, A. E., Lovchev, V. N., Kharina, I. L., Gutsev, D. F.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.12.2017; Springer Nature B.V
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Contact stresses; Corrosion and Coatings; Corrosion mechanisms; Crack propagation; Galvanic corrosion; Housing; Industrial Chemistry/Chemical Engineering; Industrial Corrosion Problems; Inorganic Chemistry; Materials Science; Metallic Materials; Morphology; Operating temperature; Steam electric power generation; Stress corrosion cracking; Tribology; Welded joints; crack; morphology; stress corrosion cracking; weld joint
• ISSN: 2070-2051; 2070-206X
• DOI: 10.1134/S2070205117070103

Results of an investigation of the morphology of cracks that form during the operation in the weld joint of a heat-carrier drum with the steam-generator housing of nuclear-power plant with a VVER-1000 unit are given. The reasons for the formation of cracks are the compound-stress state of weld units, the corrosive effect of the heat carrier, and the operating temperature. Crack formation proceeds according to the delayed stress corrosion cracking on the internal surface of metal upon contact with the corrosion medium. The features of crack formation and propagation mechanism should be considered during remedial measures that are aimed at the maintenance of the reliability of the weld joint of a drum with the steam-generator housing of VVER-1000 units.