Effect of Aging on Pitting Corrosion Resistance of 21Cr Lean Duplex Stainless Steel with Different Molybdenum Contents
Source abstract
Abstract
The effects of aging heat treatment on localized corrosion behavior in lean duplex stainless steel with 0-2% Mo were investigated. The cold-rolled samples were solution-treated at 1050 °C for 5 min, and during subsequent aging at 700 °C, precipitation of a secondary phase occurred at the α-phase interior and/or the α/γ-phase boundary; this precipitate was confirmed as Cr2N. Less Cr2N was precipitated with increasing Mo content than with increasing aging time. The pitting potential (Epit) and critical pitting temperature values decreased drastically, even after 5 min of aging time, compared with the as-solutionized steel; the values decreased with aging time. This behavior was likely caused by the depletion of Cr and N components related to precipitation of Cr2N at the α/γ-phase boundary.
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Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Corrosion Behavior and Inhibition · Welding Techniques and Residual Stresses
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