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Journal of Applied Electrochemistry

, Volume 43, Issue 3, pp 347–365 | Cite as

Effect of modes of metal transfer and microstructure on corrosion behavior of welded modified ferritic stainless steel in acidic environments

  • Manidipto Mukherjee
  • Tapan Kumar PalEmail author
Original Paper

Abstract

The effects of modes of metal transfer, i.e., short-circuit (SC) and spray (S) modes in single-pass gas metal arc welding of modified ferritic stainless steel using two types of austenitic stainless steel filler metals on microstructure as well as corrosion behavior of weld metal and high-temperature heat-affected zone (HTHAZ), were investigated. The results show that primary solidification modes (PSM) of the welds were exclusively dependent upon the Creq/Nieq ratio of the respective welds. However, the amount of grain boundary austenite and martensite transformation in the welds were solely dependent upon the mode of metal transfer and the extent of cooling rate. Regarding the corrosion mechanism, grain boundary corrosion (GBC) behavior of welds and HTHAZ relied on the microstructural changes along the grain boundary due to the variation in mode of metal transfer. The results show that S-mode resisted grain boundary corrosion of the welds and both GBC as well as pitting corrosion of the HTHAZ. On the other hand, SC-mode improved only pitting corrosion resistance of the welds. Between the filler wires used, 316L welds, in general, provided better corrosion resistance compared with 308L welds.

Keywords

Ferritic Stainless steel Welding Polarization Grain boundary corrosion Pitting corrosion 

Notes

Acknowledgments

This work is supported by the Council of Scientific and Industrial Research (CSIR), New Delhi, India. The authors would like to thank Mr. Sunil Sisodia, DGM (Quality), Salem Steel Plant, SAIL, Tamil Nadu, India, for providing the experimental materials and Mrs. D. Kanchanamala of IIT Madras, India, for her assistance in TEM work.

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Copyright information

© Springer Science+Business Media Dordrecht 2012

Authors and Affiliations

  1. 1.Metallurgical and Material Engineering DepartmentWelding Technology Center, Jadavpur UniversityKolkataIndia

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