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.
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 language | English |
|---|---|
| Pages (from-to) | 3519-3532 |
| Number of pages | 14 |
| Journal | Metallurgical and Materials Transactions A |
| Volume | 45A |
| Issue number | 8 |
| Early online date | 23 Apr 2014 |
| DOIs | |
| Publication status | Published - Jul 2014 |
Keywords
- Nickel base alloys
- solidification
- dissimilar Weld
- clad
- element segregation
- GTAW
