Effect of nitrogen on σ transformation in duplex stainless steel weld metal

Y. S. Sato, H. Kokawa, T. Kuwana

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


Duplex stainless steels were gas tungsten arc welded without filler material in various Ar-N2 mixed gas atmospheres. Weld metals having different nitrogen contents were annealed at 900-1300 K to examine the single effect of nitrogen on the σ transformation. Nitrogen content of the weld metal did not influence the nose temperature and the time for σ initiation in time-temperature-precipitation diagrams for σ, but did decrease the a content after annealing for long times. These results were correlated with the nitrogen content and microstructure of the weld metals. The effect of a on the fracture toughness of the weld metal was evaluated by the small punch (SP) test. A small amount of σ in the weld metal led to a marked decrease in the SP energy.

Original languageEnglish
Pages (from-to)41-49
Number of pages9
JournalScience and Technology of Welding and Joining
Issue number1
Publication statusPublished - 1999


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