Open AccessStress corrosion cracking behavior of welding joint of high strength steel
Author(s) -
Raffaele Sepe,
Flavia Bollino,
Fabrizia Caiazzo,
Filippo Berto
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1038/1/012055
Subject(s) - materials science , slow strain rate testing , welding , corrosion , ultimate tensile strength , stress corrosion cracking , strain rate , metallurgy , crosshead , joint (building) , cracking , seawater , elongation , fracture (geology) , stress (linguistics) , composite material , flexural strength , structural engineering , linguistics , oceanography , philosophy , engineering , geology
Nowadays, high-strength steel structures are increasingly being used in marine or soil environments, but low attention has been paid on the corrosion and stress corrosion cracking problem. In this paper, the susceptibility to stress corrosion cracking (SCC) of butt-welding joints of Strenx ® 700 (S690QL high strength steel) both in marine and acid-polluted marine atmospheres was studied, by using slow strain rate tensile (SSRT) test. The seawater corrosion environment was considered and it was prepared following the ASTM D1141. To study the influence of the environment pH, NaOH 0,1M solutions and pure H 2 SO 4 were used to adjust the pH of the simulated seawater solution to 8 and 4, respectively. The slow strain rate tensile tests (SSRT) with a crosshead speed of 0.000017 mm/s were carried out at room temperature (approximately 25 °C). After failure, the SCC susceptibility was evaluated acquiring the elongation loss rate and the reduction-in-area loss rate. The fracture surfaces were analyzed by SEM observation.