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首页> 外文期刊>Corrosion: The Journal of Science and Engineering >Study of Environmentally Assisted Cracking of Duplex Stainless Steels as a Result of the Presence of Sigma Phase
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Study of Environmentally Assisted Cracking of Duplex Stainless Steels as a Result of the Presence of Sigma Phase

机译：Study of Environmentally Assisted Cracking of Duplex Stainless Steels as a Result of the Presence of Sigma Phase

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摘要

Offshore operations worldwide recently reported the presence of improperly heat-treated 2205 (UNS S32205) and 2507 (UNS 532750) duplex stainless steel (SS) pipe fittings with varying volume fractions of embrittling second-phase particles (such as sigma, σ). Duplex SS plate and pipe samples were heat-treated to generate levels of σ phase ranging from 0 to 14. Test coupons were then prepared from these sigmatized duplex SS materials for cyclic polarization, galvanostatic, and potentiodynamic testing in simulated seawater solutions at 25℃ and 80℃. These tests helped interpret and characterize the reduction in pitting resistance of sigmatized duplex SS. To evaluate the environmentally assisted cracking (EAC) sus-ceptibility of these materials, slow strain rate testing (SSRT) was carried out. These tests were also replicated using sam-ples prepared from duplex SS components obtained from off-shore facilities. The results obtained suggest that pitting is more stable at higher a contents. However, the potential gap between open-circuit potential (OCP) and pitting potential is insensitive to the increase in the a volume fraction. This is consistent for both duplex SS evaluated. On the other hand, a monotonical increase in potential gap between pitting poten-tial obtained at the stable pitting current and that obtained from cyclic polarization was observed with increasing a con-tent. This behavior is consistent with the occurrence of crevice-like corrosion at the intermetallic ferrite interface. Evaluation of EAC susceptibility indicates that cracking does not occur at the test conditions. Using the hypothesis of crevice-like corrosion at near OCP conditions, a model for EAC was implemented that explained the relationship between the electrochemical results and those obtained from the SSRT testing.

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