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MICROSTURE AND PITTING CORROSION RESISTANCE OF UNS S32304 DUPLEX STAINLESS STEELS WELDED JOINT WITH PLASMA-ARC WELDING |
HONG Jufeng, TAN Hua, CHEN Lindou, LI Jing, LI Li, JIANG Yiming |
1) Department of Materials Science, Fudan University, Shanghai 200433
2) The Center of Analysis and Measurement, Fudan University, Shanghai 200433 |
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Cite this article:
HONG Jufeng TAN Hua CHEN Lindou LI Jing LI Li JIANG Yiming. MICROSTURE AND PITTING CORROSION RESISTANCE OF UNS S32304 DUPLEX STAINLESS STEELS WELDED JOINT WITH PLASMA-ARC WELDING. Acta Metall Sin, 2011, 47(11): 1445-1449.
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Abstract Microstructure and pitting corrosion resistance of UNS S32304 duplex stainless steels welded joint with plasma-arc welding (PAW) were studied by means of OM, SEM, energy dispersive X-ray spectroscopy (EDX) and potentiostatic electrochemical technique. The results show that the microstructures of the heat-affected zone (HAZ) and fusion zone differ from the base metal greatly, with ferrite fraction greater than 70\%. Furthermore, a lot of nitrides are precipitated at the interface between ferrite and austenite phases and inside the ferrite grains. Consequently, pitting corrosion resistance of the welded joint declines obviously and pitting preferentially occurs at ferrite phase in the high temperature HAZ near the fusion line.
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Received: 17 May 2011
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Fund: Supported by National Natural Science Foundation of China (Nos.50871031, 51071049, 51131008 and 51134010), and Shanghai Principal Project of Advanced Technology Industry |
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