Effect of electromagnetic stirring on microstructure formation in 12%Ni steel ESW weld metal

Liquefied natural gas (LNG) has recently received much attention worldwide because of environmental concerns. In general, users and fabricators use high-cost welding materials such as Ni-based weld metals. For highly efficient welding and lower cost welding materials, our research group are developi...

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Bibliographic Details
Published in:Welding in the world 2023, Vol.67 (1), p.141-149
Main Authors: Ito, Takanori, Ozaki, Osamu, Nishimura, Tomohiro, Hashimoto, Hiroshi, Nako, Hidenori, Ishizaki, Keito
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Columnar structure
Dendritic structure
Electromagnetic stirring
Electroslag welding
Equiaxed structure
Flow velocity
Grains
Inclusions
Liquefied natural gas
Liquid metals
Materials Science
Metallic Materials
Microstructure
Research Paper
Solid Mechanics
Solidification
Theoretical and Applied Mechanics
Weld metal
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Summary:Liquefied natural gas (LNG) has recently received much attention worldwide because of environmental concerns. In general, users and fabricators use high-cost welding materials such as Ni-based weld metals. For highly efficient welding and lower cost welding materials, our research group are developing 12%Ni steel weld metals for electroslag welding (ESW). However, it has reported that the Charpy impact energies decreased as notch position approached the final solidification part in ESW. To improve microstructure at this position, electromagnetic stirring (EMS) is applied for ESW in this study. In the weld metal with EMS, equiaxed prior-γ grains were formed at the final solidification part. The shape of the solidification structure was changed from columnar to equiaxed. This result indicates that change of convection in molten metal by EMS induces dendrite fragmentation and the equiaxed grains are formed. In addition, the number density of inclusions in the weld metal decreased by EMS. From results of the simulation, it is suggested that interaction of inclusions changes depending on distribution of flow velocity in molten metal.
ISSN:0043-2288
1878-6669
DOI:10.1007/s40194-022-01420-3