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The Effect of Alloying Elements and Heat Treatment on the Pitting Corrosion of 440 A Martensitic Stainless Steels  

Kim, Moo-Gil (Dept. of Metal System Engineering, Pukyong National University)
Jung, Byong-Ho (Dept. of Metal System Engineering, Pukyong National University)
Lee, Byoung-Chan (Dept. of Advanced Material, Ulsan Campus of Koreapolytechnic VII)
Publication Information
Journal of the Korean Society for Heat Treatment / v.22, no.2, 2009 , pp. 67-74 More about this Journal
Abstract
440A martensitic stainless steels which were modified with reduced carbon content (${\sim}$0.5%) and addition of small amount of nickel, vanadium, tungsten and molybdenum were manufactured. Effects of alloying elements and heat treatment on the pitting corrosion in 3.5% NaCl were investigated through the electrochemical polarization tests. The lowest pitting potential, $E_p$, was obtained when austenitizing temperature was $1250^{\circ}C$ and this is because of the grain coarsening. When austenitized at $1050^{\circ}C$ and tempered at $350{\sim}750^{\circ}C$, the highest $E_p$ was obtained at $350^{\circ}C$, while the lowest at $450^{\circ}C$ and $550^{\circ}C$ regardless of alloying elements added. But $E_p$ was increased a little at the tempering temperature of $450^{\circ}C$ and $550^{\circ}C$ when 0.4 wt.% of tungsten was added. More pitting was observed at $450{\sim}550^{\circ}C$, and pitting was formed at regions where Cr concentration is low or grain boundaries are intersecting and showed irregular shape.
Keywords
440 A; Alloying elements; Pitting corrosion; Electrochemical polarization test; Pitting potential; Austenitizing temperature; Tempering;
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