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Tailleart, Nicole R.
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article
Recovery of the Pitting Corrosion Resistance for a Sensitized Duplex Stainless Steel Using Interstitial Hardening
Abstract
<jats:p>A cast duplex stainless steel, alloy 2205, a mix of ferrite and austenite, was heat-treated at 845 <jats:sup>o</jats:sup>C for 1 and 5 hours. These heat treatments resulted in the formation of additional phases, e.g. sigma and chi, which depleted the surrounding grains of passivity promoting alloying elements such as Cr, causing alloy sensitization and a corresponding decrease in the pitting resistance. A low temperature gas-phase interstitial hardening (IH) surface modification process was used to surface alloy sensitized samples. Anodic polarization curves showed that after receiving the IH treatment, the pitting resistance, determined by the pitting potential, of sensitized samples was restored to values of the as-cast material.</jats:p>