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Nitrogen loss and effects on microstructure in multipass TIG welding of a super duplex stainless steel
University West, Sweden; Innovatum AB, Sweden.
RISE, Swerea, KIMAB. RISE - Research Institutes of Sweden, Materials and Production, KIMAB. University West, Sweden.ORCID iD: 0000-0001-5110-449X
University West, Sweden.
University West, Sweden.
2016 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 98, p. 88-97Article in journal (Refereed) Published
Abstract [en]

Nitrogen loss is an important phenomenon in welding of super duplex stainless steels. In this study, a super duplex stainless steel was autogenously TIG-welded with one to four bead-on-plate passes with low or high heat inputs using pure argon shielding gas. The goal was to monitor nitrogen content and microstructure for each weld pass. Nitrogen content, measured by wavelength dispersive X-ray spectrometry, was after four passes reduced from 0.28 wt% in the base metal to 0.17 wt% and 0.10 wt% in low and high heat input samples, respectively. Nitrogen loss resulted in a more ferritic structure with larger grains and nitride precipitates. The ferrite grain width markedly increased with increasing number of passes and heat input. Ferrite content increased from 55% in base metal to 75% at low and 79% at high heat inputs after four passes. An increasing amount of nitrides were seen with increasing number of weld passes. An equation was suggested for calculation of the final nitrogen content of the weld metal as functions of initial nitrogen content and arc energy. Acceptable ferrite contents were seen for one or two passes. The recommendation is to use nitrogen in shielding gas and proper filler metals.

Place, publisher, year, edition, pages
Elsevier Ltd , 2016. Vol. 98, p. 88-97
Keywords [en]
Ferrite content, Multipass welding, Nitrogen loss, Super duplex stainless steel, Thermodynamical calculation, TIG welding, Argon, Ferrite, Filler metals, Gas welding, Inert gas welding, Joints (structural components), Laser beam welding, Metals, Microstructure, Nitrides, Nitrogen, Shielding, Welding, Welds, Multi-pass welding, Thermodynamical, TIG-welding, Stainless steel
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-41220DOI: 10.1016/j.matdes.2016.03.011Scopus ID: 2-s2.0-84963604761OAI: oai:DiVA.org:ri-41220DiVA, id: diva2:1377351
Note

Funding details: 2014-01910; Funding text 1: Dr. Fredrik Lindberg (Swerea KIMAB) is highly acknowledged for his skillfully performing SEM, EDS and WDS analyses. Financial support of the KK Foundation for the DuplexWeld project (Project Number: 2014-01910 ) is appreciatively acknowledged. Authors would like to thank Dr. Joel Andersson and Dr. M. Asunción Valiente Bermejo (University West) for their valuable comments and help.

Available from: 2019-12-11 Created: 2019-12-11 Last updated: 2019-12-11Bibliographically approved

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