On the prediction of macrosegregation in vacuum arc remelted ingots

Mramor, Katarina (author), Quatravaux, T. (author), Combeau, Hervé (author), Jardy, A. (author), Založnik, Miha (author), Crassous, I. (author), Gaillac, A. (author)

The chemical homogeneity and metallurgical structure of vacuum arc remelted (VAR) zirconium ingots are directly responsible for product quality. It is therefore important to understand the relationship between these properties and the operating conditions. An in-depth analysis of the modelling of solidification phenomena during the VAR was carried out. Such model, solves a coupled set of transient equations for heat, momentum, solute transport and turbulence in an axisymmetric geometry. The remelting and cooling of a cylindrical ingot are calculated for time-dependent operating parameters. The solidification mechanisms implemented in the model can be applied to multi-component industrial alloys such as Zircaloy-4, which provides information on the macrosegregation phenomena studied in this paper. The model results were validated, based on the remelting of a specially designed chemically homogeneous Zircaloy-4 electrode. The results illustrate the importance of thermal and solute convection, the importance of the permeability of the partially solid material and the weak influence of nuclei density and solute diffusion in the solid phase on the prediction of macrosegregation in Zircaloy-4 ingots.

• Language: English
• Keywords: macrosegregation, vacuum arc remelting, microsegregation
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Year: 2022
• Number of pages: 19 str.
• Numbering: Vol. 53
• PID: 20.500.12556/RUL-141038
• UDC: 621.74
• ISSN on article: 1073-5615
• DOI: 10.1007/s11663-022-02578-3
• COBISS.SI-ID: 113921027
• Publication date in RUL: 22.09.2022

Record is a part of a journal

• Title: Metallurgical and materials transactions. Process metallurgy and materials processing science
• Shortened title: Metall. mater. trans., B, Proc. metall. mater. proc. sci.
• Publisher: Minerals, Metals & Materials Society, ASM International
• ISSN: 1073-5615
• COBISS.SI-ID: 3461654

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: makroizcejanje, vakumsko pretaljanje, model mikroizcejanja

Projects

• Funder: Other - Other funder or multiple funders
• Funding programme: French National Research Agency
• Project number: ANR-08-MAPR-0006-04
• Name: Optimizing Processes based on Electrode Remelting