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Metals 2017, 7(9), 333; doi:10.3390/met7090333

Resistance Upset Welding of ODS Steel Fuel Claddings—Evaluation of a Process Parameter Range Based on Metallurgical Observations

1
Den-Service d’Etudes Mécaniques et Thermiques (SEMT), CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
2
Centre National de la Recherche Scientifique (CNRS), University Bordeaux, ICMCB, UPR 9048, F-33600 Pessac, France
3
Surface Analyses Departement, University Bordeaux, Placamat, UMS 3626, F-33600 Pessac, France
*
Author to whom correspondence should be addressed.
Received: 18 July 2017 / Revised: 28 July 2017 / Accepted: 8 August 2017 / Published: 29 August 2017
(This article belongs to the Special Issue Alloy Steels)
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Abstract

Resistance upset welding is successfully applied to Oxide Dispersion Strengthened (ODS) steel fuel cladding. Due to the strong correlation between the mechanical properties and the microstructure of the ODS steel, this study focuses on the consequences of the welding process on the metallurgical state of the PM2000 ODS steel. A range of process parameters is identified to achieve operative welding. Characterizations of the microstructure are correlated to measurements recorded during the welding process. The thinness of the clad is responsible for a thermal unbalance, leading to a higher temperature reached. Its deformation is important and may lead to a lack of joining between the faying surfaces located on the outer part of the join which can be avoided by increasing the dissipated energy or by limiting the clad stick-out. The deformation and the temperature reached trigger a recrystallization phenomenon in the welded area, usually combined with a modification of the yttrium dispersion, i.e., oxide dispersion, which can damage the long-life resistance of the fuel cladding. The process parameters are optimized to limit the deformation of the clad, preventing the compactness defect and the modification of the nanoscale oxide dispersion. View Full-Text
Keywords: ODS steel; PM2000; oxide dispersion strengthened; welding; resistance welding; fuel cladding; sodium fast reactor; dynamical recrystallization ODS steel; PM2000; oxide dispersion strengthened; welding; resistance welding; fuel cladding; sodium fast reactor; dynamical recrystallization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Corpace, F.; Monnier, A.; Grall, J.; Manaud, J.-P.; Lahaye, M.; Poulon-Quintin, A. Resistance Upset Welding of ODS Steel Fuel Claddings—Evaluation of a Process Parameter Range Based on Metallurgical Observations. Metals 2017, 7, 333.

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