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

조동민; 박진성; 홍승갑; 황중기; 김성진

doi:10.5695/jkise.2021.54.3.102

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 원문보기

한국표면공학회지 = Journal of the Korean institute of surface engineering, v.54 no.3, 2021년, pp.102 - 111

조동민 (순천대학교 신소재공학과) , 박진성 (순천대학교 신소재공학과) , 홍승갑 (포스코 기술연구원) , 황중기 (동명대학교 기계공학부) , 김성진 (순천대학교 신소재공학과)

Abstract ▼ AI-Helper

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), Cr2N precipitation, and phase transformation from the austenite phase to ɛ-martensite(via stress-induced 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 ℃ showed inferior corrosion resistance, caused by precipitation of the sigma phase enriched with Cr and Mo. At 1100 ℃ 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.

주제어

표/그림 (12)

표 Table 1. Chemical compositions(wt %) of tested specimen.
그림 Fig. 1. Schematic diagram: (a) specimen preparation, and (b) three electrode corrosion cell used in the electrochemical experiments.
그림 Fig. 2. Microstructure of weld metal in the as-welded condition: (a) FE-SEM morphology, (b) EBSD phase map, and (c) TEM image and EDS analysis.
그림 Fig. 3. EBSD phase map of the cross-section of specimen: (a) plate, (b) pipe before PWHT, and (c) pipe after PWHT at 1050 ºC for 5 min.
그림 Fig. 4. Critical pitting temperature measurements of specimens after PWHT at different temperatures for 5 min, evaluated by ASTM G 150.
그림 Fig. 5. Surface morphologies of the specimens, which had been post weld heat-treated at (a) 950 ℃, (b) 1000 ℃, (c) 1050 ℃, and (d) 1100 ℃, for 5 min, after the potentiodynamic polarization test.
그림 Fig. 6. EDS analysis of the specimen, which had been post weld heat-treated at 950 ℃ for 5 min, after potentiodynamic polarization test.
그림 Fig. 7. EBSD phase map of the specimen, which had been post weld heat-treated at (a) 950 ℃, (b) 1000 ℃, (c) 1050 ℃, and (d) 1100 ℃ for 5 min.
그림 Fig. 8. Critical pitting temperature measurements of the specimens after PWHT after different temperatures for 30 min, evaluated by ASTM G 150.
그림 Fig. 9. Surface morphologies of the specimens that had been post weld heat-treated at (a) 950 ℃, (b) 1000 ℃, (c) 1050 ℃, and (d) 1100 ℃, for 30 min, after the potentiodynamic polarization test.
그림 Fig. 10. EBSD phase map of the specimen that had been post weld heat-treated at (a) 950 ℃, (b) 1000 ℃, (c) 1050 ℃, and (d) 1100 ℃ for 30 min.
그림 Fig. 11. (a) Microstructure and (b) EBSD phase map of base metal that had been post weld heat treated at 1050 ℃ for 30 min.

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저자의 다른 논문 :

표제어: PCR

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