Microstructural evolution of Inconel 625 and Inconel 686CPT weld metal for clad carbon steel linepipe joints: a comparator study

Charles A. Maltin, Alexander M. Galloway, Martin Mweemba

Research output: Contribution to journalArticle

13 Citations (Scopus)
1835 Downloads (Pure)

Abstract

Microstructural evolution of Inconel 625 and Inconel 686CPT filler metals,
used for the fusion welding of clad carbon steel linepipe, has been
investigated and compared. The effects of iron dilution from the linepipe
parent material on the elemental segregation potential of the filler metal
chemistry has been considered. The results obtained suggest that, in
Inconel 686CPT weld metal, the segregation of tungsten is a function of
the level of iron dilution from the parent material. The data presented
suggest that the incoherent phase precipitated in the Inconel 686CPT weld
metal has a morphology that is dependent on tungsten enrichment and,
therefore, iron dilution. Furthermore, in the same weld metal a continuous
network of finer precipitates was observed. The Charpy impact toughness
of each filler metal was evaluated and the results highlighted the superior
impact toughness of the Inconel 625 weld metal over that of Inconel
686CPT.
Original languageEnglish
Pages (from-to)3519-3532
Number of pages14
JournalMetallurgical and Materials Transactions A
Volume45A
Issue number8
Early online date23 Apr 2014
DOIs
Publication statusPublished - Jul 2014

Keywords

  • Nickel base alloys
  • solidification
  • dissimilar Weld
  • clad
  • element segregation
  • GTAW

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