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Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding
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 experiment...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073487/ https://www.ncbi.nlm.nih.gov/pubmed/30036987 http://dx.doi.org/10.3390/ma11071252 |
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author | Billotte, Thomas Daloz, Dominique Rouat, Bernard Tirand, Guillaume Kennedy, Jacob R. Robin, Vincent Zollinger, Julien |
author_facet | Billotte, Thomas Daloz, Dominique Rouat, Bernard Tirand, Guillaume Kennedy, Jacob R. Robin, Vincent Zollinger, Julien |
author_sort | Billotte, Thomas |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-6073487 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-60734872018-08-13 Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding Billotte, Thomas Daloz, Dominique Rouat, Bernard Tirand, Guillaume Kennedy, Jacob R. Robin, Vincent Zollinger, Julien Materials (Basel) Article 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. MDPI 2018-07-20 /pmc/articles/PMC6073487/ /pubmed/30036987 http://dx.doi.org/10.3390/ma11071252 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Billotte, Thomas Daloz, Dominique Rouat, Bernard Tirand, Guillaume Kennedy, Jacob R. Robin, Vincent Zollinger, Julien Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding |
title | Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding |
title_full | Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding |
title_fullStr | Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding |
title_full_unstemmed | Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding |
title_short | Microsegregation Model Including Convection and Tip Undercooling: Application to Directional Solidification and Welding |
title_sort | microsegregation model including convection and tip undercooling: application to directional solidification and welding |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073487/ https://www.ncbi.nlm.nih.gov/pubmed/30036987 http://dx.doi.org/10.3390/ma11071252 |
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