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

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      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.

      Author(s):Maltin, Charles A., Galloway, Alexander M. ORCID: https://orcid.org/0000-0003-0143-8314 and Mweemba, Martin
      Item type:Article
      ID code:47652
      Keywords:Nickel base alloys , solidification, dissimilar Weld, clad, element segregation, GTAW, Mechanical engineering and machinery, Mining engineering. Metallurgy, Mechanical Engineering, Mechanics of Materials, Metals and Alloys
      Subjects:Technology > Mechanical engineering and machinery
      Technology > Mining engineering. Metallurgy
      Department:Faculty of Engineering > Mechanical and Aerospace Engineering
      Depositing user: Pure Administrator
      Date deposited:28 Apr 2014 08:19
      Last modified:16 Jul 2019 01:11
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      URI:https://strathprints.strath.ac.uk/id/eprint/47652
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