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http://dx.doi.org/10.9726/kspse.2011.15.3.052

The Effect of Alloying Elements and Heat Treatment on the Intergranular Corrosion of 440A Martensitic Stainless Steel(II)  

Kim,, Y.C. (부경대학교 공과대학 금속공학과)
Jung, B.H. (부경대학교 공과대학 금속공학과)
Kang, C.Y. (부경대학교 공과대학 금속공학과)
Publication Information
Journal of Power System Engineering / v.15, no.3, 2011 , pp. 52-57 More about this Journal
Abstract
440A martensitic stainless steels which were modified with reduced carbon content(~0.5wt.%) and addition of small amount of vanadium, tungsten and molybdenum 0.4wt.%, 0.4wt.% and 0.68wt.% respectively were manufactured. Effects of alloying elements and tempering temperatures on the intergranular corrosion were investigated through the method of DL-EPR(Double-electrochemical potentiodynamic reactivation). It was thought that the highest DOS(Degree of sensitization) of specimens was obtained at the tempering temperature of $450^{\circ}C$ regardless of types of alloy because of the precipitation of Cr7C3. Addition of vanadium lowered DOS a little above the tempering temperature of $550^{\circ}C$. It was considered to be effected by precipitation of VC carbides. Intergranular corrosion was influenced more by tempering temperature than by alloying elements of V, W and Mo.
Keywords
Alloying Element; Heat Treatment; Intergranular Corrosion; Degree Of Sensitization(DOS);
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  • Reference
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