Microstructure and Corrosion Properties of Laser-Welded SAF 2507 Super Duplex Stainless Steel Joints

SAF 2507 super duplex stainless steel has been welded using laser beam (LB) welding and laser/gas metal arc hybrid (LGH) welding processes. The pitting and intergranular corrosion properties of the welding joints have been tested using electrochemical testing and microstructure observations. The vol...

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Veröffentlicht in:	Journal of materials engineering and performance 2019-01, Vol.28 (1), p.287-295
Hauptverfasser:	Qi, Kai, Li, Ruifeng, Wang, Guangjin, Li, Gangzhi, Liu, Bin, Wu, Mingfang
Format:	Artikel
Sprache:	eng
Schlagworte:	Characterization and Evaluation of Materials Chemistry and Materials Science CHROMIUM NITRIDES Corrosion and Coatings CORROSION RESISTANCE CRYSTAL LATTICES ELECTROCHEMISTRY Engineering Design HEAT AFFECTED ZONE INTERGRANULAR CORROSION LASER WELDING MATERIALS SCIENCE METALS MICROSTRUCTURE PITTING CORROSION Quality Control Reliability Safety and Risk STAINLESS STEELS Tribology
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Zusammenfassung:	SAF 2507 super duplex stainless steel has been welded using laser beam (LB) welding and laser/gas metal arc hybrid (LGH) welding processes. The pitting and intergranular corrosion properties of the welding joints have been tested using electrochemical testing and microstructure observations. The volume fraction of the ferrite phase reaches 70% in the weld zone of the LB welding joint, while the volume fraction of the ferrite phase is 60% for the welding joint of LGH due to the introduction of Ni from welding wire. The pitting corrosion resistance of the welding joint for LB is better than that of LGH. The pitting corrosion is easily conceived in the heat-affected zone (HAZ) because of the formation of Cr 2 N in the HAZ during welding.
ISSN:	1059-9495 1544-1024
DOI:	10.1007/s11665-018-3833-5