二相ステンレス鋼の孔食電位に及ぼすγ相量の影響

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  • Effect of Austenite Phase Content on Pitting Potential of a Duplex Stainless Steel
  • 2相ステンレス鋼の孔食電位に及ぼすγ相量の影響
  • 2ソウ ステンレス コウ ノ コウショク デンイ ニ オヨボス ガンマソウリョ

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In order to examine the effect of γ phase content on pitting potential of a duplex stainless steel, pitting potentials for type 329 J1 duplex stainless steel with the different α/γ phase ratio prepared by isothermal heat treatment in NaCl and NaCl-H2SO4 solutions have been determined by measurements of the anodic polarization curves. The dependence of measured pitting potentials on γ phase content was considered on the basis of the results for the microscopic observation of pit sites on the metal surface and the EPMA analysis of chemical compositions for α and γ phases. When the structure of type 329 J1 steel changed from α single phase to (α+γ) duplex phase, pitting potential in NaCl solution lowered significantly. This lowering of pitting potential corresponded to the change in pitting site from a phase to γ phase. Pitting potentials of type 329 J1 steels with (α+γ) duplex structure decreased slightly with an increase in γ phase content in NaCl and NaCl-H2SO4 solutions. It was considered that such decreases in pitting potentials were attributed to the decrease in chromium content of the transgranular precipited γ phase on which pits generated with an increase in γ phase content.

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