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

Maltin, Charles A. and Galloway, Alexander M. and Mweemba, Martin (2014) Microstructural evolution of Inconel 625 and Inconel 686CPT weld metal for clad carbon steel linepipe joints : a comparator study. Metallurgical and Materials Transactions A, 45A (8). pp. 3519-3532. ISSN 1073-5623 (https://doi.org/10.1007/s11661-014-2308-z)

[thumbnail of Maltin C & Galloway AM - Pure - Microstructural evolution of IN625 and IN686 weld metal for clad carbon steel linepipe joints Feb 2014]
Preview
 PDF. Filename: Maltin_C_Galloway_AM_Pure_Microstructural_evolution_of_IN625_and_IN686_weld_metal_for_clad_carbon_steel_linepipe_joints_Feb_2014.pdf
Preprint
License: Creative Commons Attribution-NonCommercial-ShareAlike 4.0 logo
Download (15MB)| Preview
[thumbnail of Maltin C & Galloway AM - Pure - Supplementary Material Feb 2014] PDF. Filename: Maltin_C_Galloway_AM_Pure_Supplementary_Material_Feb_2014.pdf
Preprint
Download (339kB)

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.

ORCID iDs

Maltin, Charles A., Galloway, Alexander M. ORCID logoORCID: https://orcid.org/0000-0003-0143-8314 and Mweemba, Martin;
CORE (COnnecting REpositories)