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슈퍼 듀플렉스 스테인리스강(UNS S32506) 레이저 조관용접 튜브의 용접 후 열처리에 따른 부식거동

Corrosion Behaviors of Laser-welded Super Duplex Stainless Steel(UNS S32506) Tube with Post-Weld Heat Treatment Conditions

김성진|박진성|조동민|홍승갑|황중기
한국표면공학회 (The Korean Society of Surface Science and Engineering)|2021.06|한국표면공학회지 (Journal of Surface Science and Engineering)|제54권 제3호|pp. 102-111

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참고문헌

키워드

CorrosionSuper duplex stainless steelLaser weldingUNS S32506PWHT
주제분류기계공학

초록

The corrosion behaviors of laser-welded super duplex stainless steel tubes with post-weld heat treatment(PWHT) conditions(950, 1000, 1050, 1100 ℃ for 5 and 30 min) were evaluated by electrochemical potentiodynamic polarization and critical pitting temperature measurements. This study showed that the critical metallurgical factors affecting the degradation of corrosion resistance of a steel tube in as-welded condition were the unbalanced phase fraction(ferrite:austenite = 94:4), Cr N precipitation, and phase transformation from the austenite phase to ɛ-martensite(via stress-2induced phase transformation). The improvement in the corrosion resistance of the welded specimen depends greatly on the PWHT conditions. The specimens after PWHT conducted below 1000 oC showed inferior corrosion resistance, caused by precipitation of the sigma phase enriched with Cr and Mo. At 1100 oC for a longer duration in PWHT, the ferrite phase grows, and its fraction increases, leading to an unbalanced phase fraction in the microstructure. As a result, pitting can be initiated primarily at the interface between the ferrite/austenite phase, particularly in base metal.

Abstract

The corrosion behaviors of laser-welded super duplex stainless steel tubes with post-weld heat treatment(PWHT) conditions(950, 1000, 1050, 1100 ℃ for 5 and 30 min) were evaluated by electrochemical potentiodynamic polarization and critical pitting temperature measurements. This study showed that the critical metallurgical factors affecting the degradation of corrosion resistance of a steel tube in as-welded condition were the unbalanced phase fraction(ferrite:austenite = 94:4), Cr N precipitation, and phase transformation from the austenite phase to ɛ-martensite(via stress-2induced phase transformation). The improvement in the corrosion resistance of the welded specimen depends greatly on the PWHT conditions. The specimens after PWHT conducted below 1000 oC showed inferior corrosion resistance, caused by precipitation of the sigma phase enriched with Cr and Mo. At 1100 oC for a longer duration in PWHT, the ferrite phase grows, and its fraction increases, leading to an unbalanced phase fraction in the microstructure. As a result, pitting can be initiated primarily at the interface between the ferrite/austenite phase, particularly in base metal.

참고문헌 (36)

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