Acta Metall Sin  2011, Vol. 47 Issue (11): 1445-1449    DOI: 10.3724/SP.J.1037.2011.00314

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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

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.

Abstract References Related Articles Recommended Metrics Download:  PDF(2897KB)  Export:  BibTeX | EndNote (RIS)       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. Key words:  duplex stainless steel      plasma-arc welding      microstructure      pitting corrosion      Received:  17 May 2011      Fund:  Supported by National Natural Science Foundation of China (Nos.50871031, 51071049, 51131008 and 51134010), and Shanghai Principal Project of Advanced Technology Industry Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors HONG Ju-Feng TAN Hua CHEN Lin-Dou LI Jin LI Li JIANG Yi-Meng URL:  https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00314     OR     https://www.ams.org.cn/EN/Y2011/V47/I11/1445 [1] Cvijovic Z, Radenkovic G. Corros Sci, 2006; 48: 3887 [2] Liou R Y, Hsieh R I, Tsai WT. Corros Sci, 2002; 44: 2841 [3] Xu J L, Deng B, Sun T, Li J, Jiang Y M. Acta Metall Sin, 2010; 46: 380 (徐菊良, 邓博, 孙 涛, 李 劲, 蒋益明. 金属学报, 2010; 46: 380) [4] Gooch T G. In: Lula ed., Duplex Stainless Steels. Metals Park, Ohio: ASM, 1983: 573 [5] Baeslack III W A, Lippold J C, Nelson D E. 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