Abstract
The magnetic pulse welding (MPW) technique was employed for the end closure joining of fuel pin cladding tubes made of ferritic-martensitic (FM) steel and oxide-dispersion strengthened (ODS) steel. The technique is a solid-state impact joining process based on the electromagnetic force, similar to explosive welding. For a given set of optimal process parameters, e.g., the end-plug geometry, the rigid metallurgical bonding between the tube and end plug was obtained by high-velocity impact collision accompanied with surface jetting. The joint region showed a typical wavy morphology with a narrow grain boundary-like bonding interface. There was no evidence of even local melting, and only the limited grain refinement was observed in the vicinity of the bonding interface without destructing the original reinforcement microstructure of the FM-ODS steel, i.e., a fine grain structure with oxide dispersion. No leaks were detected during helium leakage test, and moreover, the rupture occurred in the cladding tube section without leaving any joint damage during internal pressure burst test. All of the results proved the integrity and durability of the MPWed joints and signified the great potential of this method of end closure joining for advanced fast reactor fuel pin fabrication.
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Acknowledgments
This research was financially supported by the Korea Atomic Energy Research Institute (KAERI) R&D Program and the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIP) (No. 2012M2A8A1027872). The authors also cordially appreciate Drs. T. Jayakumar and M. Vasudevan at IGCAR in India for supplying the 9Cr-ODS steel cladding tube and Drs. J. H. Kim and S. K. Park at KAERI in Korea for helping to carry out the burst test.
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Manuscript submitted September 25, 2014.
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Lee, JG., Park, JJ., Lee, MK. et al. End Closure Joining of Ferritic-Martensitic and Oxide-Dispersion Strengthened Steel Cladding Tubes by Magnetic Pulse Welding. Metall Mater Trans A 46, 3132–3139 (2015). https://doi.org/10.1007/s11661-015-2905-5
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DOI: https://doi.org/10.1007/s11661-015-2905-5