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Open AccessArticle

Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding

1
Department of Metallurgy and Materials Science and Engineering, Institut Jean Lamour, UMR CNRS 7198, Université de Lorraine, 54000 Nancy, France
2
Laboratory of Excellence on Design of Alloy Metals for Low-mAss Structures (‘LabEx DAMAS’), Université de Lorraine, 57073 Metz, France
3
AREVA, Technical Center, 71100 Saint-Marcel, France
4
AREVA, Engineering & Projects, 69006 Lyon, France
*
Author to whom correspondence should be addressed.
Materials 2018, 11(7), 1252; https://doi.org/10.3390/ma11071252
Received: 29 June 2018 / Revised: 12 July 2018 / Accepted: 15 July 2018 / Published: 20 July 2018
(This article belongs to the Special Issue Design of Alloy Metals for Low-Mass Structures)
The microsegregation behavior of alloy filler metal 52 (FM 52) was studied using microprobe analysis on two different solidification processes. First, microsegregation was characterized in samples manufactured by directional solidification, and then by gas tungsten arc welding (GTAW). The experimental results were compared with Thermo-Calc calculations to verify their accuracy. It was confirmed that the thermodynamic database predicts most alloying elements well. Once this data had been determined, several tip undercooling calculations were carried out for different solidification conditions in terms of fluid flow and thermal gradient values. These calculations allowed the authors to develop a parametrization card for the constants of the microsegregation model, according to the process parameters (e.g., convection in melt pool, thermal gradient, and growth velocity). A new model of microsegregation, including convection and tip undercooling, is also proposed. The Tong–Beckermann microsegregation model was used individually and coupled with a modified Kurz-Giovanola-Trivedi (KGT) tip undercooling model, in order to take into account the convection in the fluid flow at the dendrite tip. Model predictions were compared to experimental results and showed the microsegregation evolution accurately. View Full-Text
Keywords: microsegregation; gas tungsten arc welding; directional solidification; FM52 filler metal; ERNiCrFe-7; tip undercooling microsegregation; gas tungsten arc welding; directional solidification; FM52 filler metal; ERNiCrFe-7; tip undercooling
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MDPI and ACS Style

Billotte, T.; Daloz, D.; Rouat, B.; Tirand, G.; Kennedy, J.R.; Robin, V.; Zollinger, J. Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding. Materials 2018, 11, 1252.

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