Weld oxide formation on lean duplex stainless steel
2008 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 50, no 9, 2620-2634 p.Article in journal (Refereed) Published
Weld oxides have a strong influence on corrosion resistance, but have hitherto only been studied to a limited extent for duplex stainless steels. X-ray photoelectron spectroscopy (XPS) has here been used to study heat tint formed on gas tungsten arc (GTA) welds on the commercial duplex grades LDX 2101 (EN 1.4162/UNS S32101) and 2304 (EN 1.4362/UNS S32304) welded with and without nitrogen additions to the shielding gas. The process of heat tint formation is discussed in terms of transport phenomena to explain the effect of atmosphere, temperature and composition. The oxides formed were found to be enriched in manganese and corrosion testing shows that nitrogen has a strong influence on the weld oxide. A mechanism is proposed including evaporation from the weld pool and subsequent redeposition.
Place, publisher, year, edition, pages
2008. Vol. 50, no 9, 2620-2634 p.
Stainless steel, EPMA, XPS, Oxidation, Pitting corrosion
IdentifiersURN: urn:nbn:se:kth:diva-9294DOI: 10.1016/j.corsci.2008.06.024ISI: 000260358900023OAI: oai:DiVA.org:kth-9294DiVA: diva2:54547
QC 20101126 Uppdaterad från submitted till published (20101126).2008-10-172008-10-172013-06-12Bibliographically approved