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산성 염화물 환경에서 F53 슈퍼 듀플렉스 스테인리스강의 2 상간의 공식 거동 연구
김순태 ( Soon Tae Kim ),공경호 ( Kyeong Ho Kong ),이인성 ( Sung Lee ),박용수 ( Yong Soo Park ),이종훈 ( Jong Hoon Lee ),김두현 ( Doo Hyun Kim ) 한국부식방식학회(구 한국부식학회) 2014 Corrosion Science and Technology Vol.13 No.3
The pitting corrosion behaviors between the constituent phases in F53 super duplex stainless steel (SDSS) in acidified chloride environments were investigated using a critical pitting corrosion temperature test, a potentiodynamic anodic polarization test, and the microstructure analyses through a SEM-EDS and a SAM. As the solution annealing temperature decreased from 1150℃ to 1050℃, the γ-phase fraction increased whereas the α-phase fraction decreased. The pitting potential and the critical pitting temperature increased with a decrease of solution annealing temperature, thereby increasing the resistance to pitting corrosion. The pitting corrosion of the SDSS was selectively initiated at the α-phases because the PREN (pitting resistance equivalent number, PREN = %Cr+3.3%Mo+30%N) value of the γ-phase is much larger than that of the α-phase, irrespective of the solution annealing temperature. The pitting corrosion was finally propagated from the α-phase to the γ-phase. The decrease of solution annealing temperature enhanced the resistance to pitting corrosion greatly in acidified chloride environments due to a decrease of PREN difference between the γ-phase and the α-phase, that is, a decrease of PRENγ by dilution of N in γ-phase with an increase in the γ-phase volume fraction and an increase of PRENα by enrichment of Cr and Mo in the α-phase with a decrease in the α-phase volume fraction.
F53 슈퍼 듀플렉스 스테인리스강의 미세조직과 국부 부식 거동
김순태 ( Soon Tae Kim ),이인성 ( In Sung Lee ),공경호 ( Kyeong Ho Kong ),박용수 ( Yong Soo Park ),이종훈 ( Jong Hoon Lee ),양원존 ( Won Jon Yang ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.7
The localized corrosion behavior associated with microstructure of F53 super duplex stainless steel (SDSS) was investigated using a potentiodynamic polarization test, a critical crevice temperature test, an electron probe micro-analyzer analysis, and scanning electron microscopy-energy dispersive spectroscopy analyses. Crevice corrosion was initiated at the α/γ phase boundaries, MOx inclusions (where M is Cr, Mn, Al, Fe, or Ti), as well as Cr and Mo depleted areas adjacent to the σ-phases precipitated in the F53 SDSS alloy. This alloy had been annealed at 1050 ℃ followed by improper water-cooling, and the corrosion was propagated into the α-phases because the pitting resistance equivalent number (PREN) of the α-phase was smaller than that of the γ-phase. As cooling rate increased, the variation of the α-phases decreased, and the content of the Cr and Mo rich σ-phases decreased, thereby increasing the corrosion resistance.