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Relationship Between Properties Degradation and Critical Aging Time of Super Austenitic and Duplex Stainless Steels

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주제분류금속공학

초록

The objective of this study was to analyze effects of aging time on property degradation of super austenitic stainless steel of PRE 52.8 and super duplex stainless steel of PRE 48.7. To analyze corrosion propertiesbased on aging time, a critical pitting temperature test was performed in a solution of 6% FeCl 3 + 1% HCland an anodic polarization test was performed in deaerated 0.5N HCl + 1N NaCl solution at a temperature of 50o C. Surface hardness was measured to analyze mechanical properties. It was found that corrosionproperties and mechanical properties deteriorated rapidly as aging time increased. Critical pitting temperature had the most effect on critical aging time at which property changes occurred rapidly, followed by pitting potential and hardness. This trend was found to be closely related to the fraction of sigma phase. Rate of sigma phase formation was found to be significantly faster in duplex stainless steel than in austenitic stainless steel.

Abstract

The objective of this study was to analyze effects of aging time on property degradation of super austenitic stainless steel of PRE 52.8 and super duplex stainless steel of PRE 48.7. To analyze corrosion propertiesbased on aging time, a critical pitting temperature test was performed in a solution of 6% FeCl 3 + 1% HCland an anodic polarization test was performed in deaerated 0.5N HCl + 1N NaCl solution at a temperature of 50o C. Surface hardness was measured to analyze mechanical properties. It was found that corrosionproperties and mechanical properties deteriorated rapidly as aging time increased. Critical pitting temperature had the most effect on critical aging time at which property changes occurred rapidly, followed by pitting potential and hardness. This trend was found to be closely related to the fraction of sigma phase. Rate of sigma phase formation was found to be significantly faster in duplex stainless steel than in austenitic stainless steel.

참고문헌 (38)

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