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

10 Citations (Scopus)

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.
LanguageEnglish
Pages3519-3532
Number of pages14
JournalMetallurgical and Materials Transactions A
Volume45A
Issue number8
Early online date23 Apr 2014
DOIs
Publication statusPublished - Jul 2014

Fingerprint

Inconel (trademark)
Microstructural evolution
carbon steels
Dilution
Carbon steel
Filler metals
Welds
Tungsten
Iron
Metals
fillers
dilution
metals
iron
tungsten
fusion welding
Toughness
Fillers
Precipitates
Welding

Keywords

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

Cite this

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title = "Microstructural evolution of Inconel 625 and Inconel 686CPT weld metal for clad carbon steel linepipe joints: a comparator study",
abstract = "Microstructural evolution of Inconel 625 and Inconel 686CPT filler metals,used for the fusion welding of clad carbon steel linepipe, has beeninvestigated and compared. The effects of iron dilution from the linepipeparent material on the elemental segregation potential of the filler metalchemistry has been considered. The results obtained suggest that, inInconel 686CPT weld metal, the segregation of tungsten is a function ofthe level of iron dilution from the parent material. The data presentedsuggest that the incoherent phase precipitated in the Inconel 686CPT weldmetal has a morphology that is dependent on tungsten enrichment and,therefore, iron dilution. Furthermore, in the same weld metal a continuousnetwork of finer precipitates was observed. The Charpy impact toughnessof each filler metal was evaluated and the results highlighted the superiorimpact toughness of the Inconel 625 weld metal over that of Inconel686CPT.",
keywords = "Nickel base alloys , solidification, dissimilar Weld, clad, element segregation, GTAW",
author = "Maltin, {Charles A.} and Galloway, {Alexander M.} and Martin Mweemba",
year = "2014",
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Microstructural evolution of Inconel 625 and Inconel 686CPT weld metal for clad carbon steel linepipe joints : a comparator study. / Maltin, Charles A.; Galloway, Alexander M.; Mweemba, Martin.

In: Metallurgical and Materials Transactions A, Vol. 45A, No. 8, 07.2014, p. 3519-3532.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Microstructural evolution of Inconel 625 and Inconel 686CPT weld metal for clad carbon steel linepipe joints

T2 - Metallurgical and Materials Transactions A

AU - Maltin, Charles A.

AU - Galloway, Alexander M.

AU - Mweemba, Martin

PY - 2014/7

Y1 - 2014/7

N2 - Microstructural evolution of Inconel 625 and Inconel 686CPT filler metals,used for the fusion welding of clad carbon steel linepipe, has beeninvestigated and compared. The effects of iron dilution from the linepipeparent material on the elemental segregation potential of the filler metalchemistry has been considered. The results obtained suggest that, inInconel 686CPT weld metal, the segregation of tungsten is a function ofthe level of iron dilution from the parent material. The data presentedsuggest that the incoherent phase precipitated in the Inconel 686CPT weldmetal has a morphology that is dependent on tungsten enrichment and,therefore, iron dilution. Furthermore, in the same weld metal a continuousnetwork of finer precipitates was observed. The Charpy impact toughnessof each filler metal was evaluated and the results highlighted the superiorimpact toughness of the Inconel 625 weld metal over that of Inconel686CPT.

AB - Microstructural evolution of Inconel 625 and Inconel 686CPT filler metals,used for the fusion welding of clad carbon steel linepipe, has beeninvestigated and compared. The effects of iron dilution from the linepipeparent material on the elemental segregation potential of the filler metalchemistry has been considered. The results obtained suggest that, inInconel 686CPT weld metal, the segregation of tungsten is a function ofthe level of iron dilution from the parent material. The data presentedsuggest that the incoherent phase precipitated in the Inconel 686CPT weldmetal has a morphology that is dependent on tungsten enrichment and,therefore, iron dilution. Furthermore, in the same weld metal a continuousnetwork of finer precipitates was observed. The Charpy impact toughnessof each filler metal was evaluated and the results highlighted the superiorimpact toughness of the Inconel 625 weld metal over that of Inconel686CPT.

KW - Nickel base alloys

KW - solidification

KW - dissimilar Weld

KW - clad

KW - element segregation

KW - GTAW

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M3 - Article

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JO - Metallurgical and Materials Transactions A

JF - Metallurgical and Materials Transactions A

SN - 1073-5623

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