Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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The Effect of Alloying Elements and Heat Treatment on the Intergranular Corrosion of 440A Martensitic Stainless Steel(II)

440A 강의 입계부식에 미치는 합금원소와 열처리의 영향(II)

  • 김영철 (부경대학교 공과대학 금속공학과) ;
  • 정병호 (부경대학교 공과대학 금속공학과) ;
  • 강창룡 (부경대학교 공과대학 금속공학과)
  • Received : 2010.08.03
  • Accepted : 2011.04.12
  • Published : 2011.06.30
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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.

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References

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