Experimental investigation on the stress corrosion cracking of FV520B welded joint in natural gas environment with ECP and SSRT. (September 2018)

• Record Type: Journal Article
• Authors: Xiang, Longhao; Pan, Juyi; Chen, Songying; Zhong, Yunpan
• Is Part Of: Engineering fracture mechanics. Volume 200(2018)
• Page Start: 166
• Page End: 174
• Publication Date: 2018-09
• Subjects: FV520B -- Stress corrosion cracking -- Electrochemical corrosion -- Natural gas; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2018.07.026
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Stress corrosion and electrochemical corrosion in different environments were tested. Polarization curves and stress corrosion susceptibility were utilized to measure corrosion. The effects of temperature, pressure and CO2 /H2 S concentration were determined. The phenomenon of stress corrosion in natural gas environment was successfully validated. Abstract: For the welded joint specimens of the steel FV520B used in natural gas impellers, the uniform experimental method is applied in the experiment of electrochemical corrosion potential (ECP) under a certain concentration of H2 S and CO2, temperature and pressure to get some test data including electrochemical corrosion potential, current density, Tafel slope and polarization resistance. In addition, the stress corrosion susceptibility index has been measured by the experimental of slow strain rate tensile (SSRT). Combined with observation of crack and fracture morphology, the stress corrosion cracking mechanism of the martensitic stainless steel FV520B welded joints in the service environment is explored. The experimental results show that there are obvious tendency of stress corrosion cracking in welded joints and the relatively significant effects of temperature and CO2 concentration on corrosion current density and stress corrosion susceptibility. In the environment of 98 °C, 6 MPa, 30% H2 S and 65% CO2, the stress corrosion susceptibility of welded joint specimens is the highest, and the fracture surfaces display brittle fracture behavior.