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Solidification and solid-state phenomena during keyhole-gas tungsten arc welding of IN617 nickel-based superalloy
Keyhole gas tungsten arc welding (GTAW) is a promising welding technique that enhances productivity and sustainability in the manufacturing industry. The substantial heat input associated with the single-pass keyhole-GTAW influences the phase transformations occurring in the weld. This study aims to...
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Published in: | Science and technology of welding and joining 2025-02, Vol.30 (1), p.25-33 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites |
Online Access: | Get full text |
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Summary: | Keyhole gas tungsten arc welding (GTAW) is a promising welding technique that enhances productivity and sustainability in the manufacturing industry. The substantial heat input associated with the single-pass keyhole-GTAW influences the phase transformations occurring in the weld. This study aims to investigate the microstructural evolution during keyhole-GTAW of the IN617 nickel-based superalloy. The microstructure of the fusion zone exhibits large columnar grains and a coarse dendritic solidification structure, accompanied by interdendritic micro-segregation which lead to the formation of titanium-rich M(C,N) and molybdenum-rich carbides. The heat-affected zone is characterised by the dissolution of carbide stringers. Notably, no constitutional liquation was observed. The implications of solidification and solid-state phase transformations on the hardness characteristics and tensile properties of the weld are discussed. |
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ISSN: | 1362-1718 1743-2936 |
DOI: | 10.1177/13621718241301871 |