The Microstructure and Pitting Resistance of Weld Joints of 2205 Duplex Stainless Steel

Journal Article · Wed Nov 15 04:00:00 EST 2017 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-017-2976-0· OSTI ID:22860795

Wu, Mingfang; Liu, Fei; Pu, Juan ^[1]; Anderson, Neil E.; Li, Leijun ^[2]; Liu, Dashuang ^[1]

---

1. Jiangsu University of Science and Technology, Provincial Key Laboratory of Advanced Welding Technology (China)
2. University of Alberta, Department of Chemical and Materials Engineering (Canada)

2205 duplex stainless steel (DSS) was welded by submerged arc welding. The effects of both heat input and groove type on the ferrite/austenite ratio and elemental diffusion of weld joints were investigated. The relationships among welding joint preparation, ferrite/austenite ratio, elemental diffusion, and pitting corrosion resistance of weld joints were analyzed. When the Ni content of the weld wire deposit was at minimum 2–4% higher than that of 2205 DSS base metal, the desired ratio of ferrite/austenite and elemental partitioning between the austenite and ferrite phases were obtained. While the pitting sensitivity of weld metal was higher than that of base metal, the self-healing capability of the passive film of weld metal was better than that of the base metal when a single V-type groove was used. Furthermore, the heat input should be carefully controlled since pitting corrosion occurred readily in the coarse-grained heat-affected zone near the fusion line of welded joints.

• OSTI ID: 22860795
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 11 Vol. 26; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AUSTENITE
CORROSION RESISTANCE
DIFFUSION
FERRITE
FILMS
HEAT AFFECTED ZONE
MICROSTRUCTURE
PITTING CORROSION
STAINLESS STEELS
SUBMERGED ARC WELDING
WELDED JOINTS