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12Cr 합금강의 결정구조에 따른 전기화학적 부식민감성 평가
박광진(KwangJin Park),이규영(KwangJin Park),배동호(DongHo Bae),강용호(YongHo Kang),강명준(MyoungJun Kang),김득한(DeugHan Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Even though 12Cr alloy steel can be different in alloy composition and crystal structure according to the manufactures, it was found that more than 60% of damages were occurred at the condition alternatively repeated wet and dry and condensed vapor at low pressure. And also, it has been well known that both the mechanical properties and the influence of corrosion environments on strength of the 12Cr alloy steel change by its crystal structure. However, in spite of these common facts, it is difficult to find out the quantitative results including the particular environmental condition as well as the actual service conditions. In this study, as a fundamental investigation for providing information to design and to asses integrity of the 12Cr alloy steel, electro-chemical corrosion susceptibility and corrosion rate of the steam turbine bucket material of which its grain size is different was assessed under NaCl solution at 90℃.
12Cr 합금강의 결정립에 따른 응력부식균열 수명 평가
박광진(KwangJin Park),이규영(GyuYoung Lee),배동호(DongHo Bae),강용호(YongHo Kang),강명준(MyoungJun Kang),김득한(DeugHan Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Even though 12Cr alloy steel can be different in its alloy composition and crystal structure according to the manufactures, it was found that more than 60% of damages were occurred under the condition alternatively repeated wet and dry and condensed vapor. And also, it has been well known that both the mechanical properties and the influence of corrosion environments on its strength can be changed by the crystal structure. However, in spite of these common facts, it is difficult to find out the quantitative results including the particular environmental condition as well as the actual service conditions. In this study, as a fundamental investigation for providing information to design and to asses reliability of the 12Cr alloy steel, stress corrosion cracking of the 12Cr alloy steel of which its crystal structure is different was assessed under 2.5~3.5wt.% NaCl solution at 90℃. From these results, S-t curves for predicting damage life and design criterion of the 12Cr alloy steel including corrosion environment as well as S.C.C. condition were obtained.