This investigation demonstrated 2.1 wt% tungsten drastically reduced the kinetics of tertiary phase precipitation in 25Cr super duplex stainless steels. The slow kinetics resulted in a better overall pitting corrosion resistance.
sigma phase
Use of electrochemical techniques to determine the effect of Sigma phase (σ-phase) precipitation on a 25Cr Super Duplex Stainless Steel — Presentation
This work was presented at NACE International CORROSION 2015 “Mechanisms of Localized Corrosion” symposium.
A link to the final presentation is included.