Abstract
Effects of nitrogen (N) content on the precipitation behavior of Cr 2N with its relevant influences on the resistance to localized corrosion of high nitrogen stainless steels (HNSs) were examined using an electrochemical microcell. HNS of Fe–18Cr–20Mn–3Mo–1.07N was highly resistant to pitting corrosion. With aging the alloy at 900 °C, Cr 2N precipitated initially along grain boundaries, then within grain, and eventually formed a lamellar structure, accompanied with a drastic decrease in the resistance to pitting corrosion. It was found from the electrochemical microcell tests that the lamellar Cr 2N was the most susceptible site for pitting corrosion when compared with any other heterogeneity such as a (Mn, Cr)-oxide or a Cr 2N precipitated along the grain boundaries.
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