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Microstructural characterisation of Inconel 718 gas tungsten arc welds [Charakterisierung des Gefüges von Wolfram-Inertgas-Lichtbogen- schweißnähten in Inconel 718]
Published in Carl Hanser Verlag
2005
Volume: 42
   
Issue: 10
Pages: 481 - 498
Abstract
The presence of Nb-rich, brittle, intermetallic Laves phase in Inconel 718 weld fusion zones is detrimental to weld mechanical properties. In the current work, autogenous bead-on-plate gas tungsten-arc welds were deposited in 2 mm thick IN 718 sheets. The welds were subjected to the following heat treatments: i) direct aging, ii) solution treatment at 980°C followed by aging, and iii) solution treatment at 1080°C followed by aging. Detailed microstructural characterisation was carried out using optical, scanning electron and transmission electron microscopes and electron probe microanalysis. The microstructural features in as-welded and post-weld heat treated conditions are discussed. The results show that post-weld heat treatments alone cannot provide satisfactory solution to the Laves problem in Inconel 718 gas tungsten-arc welds.
About the journal
JournalPraktische Metallographie/Practical Metallography
PublisherCarl Hanser Verlag
ISSN0032678X
Open AccessNo
Concepts (13)
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    Brittleness
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    Heat treatment
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    Microanalysis
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    Microstructure
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    Optical microscopy
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    Scanning electron microscopy
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    Transmission electron microscopy
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    Tungsten
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    Electron probe microanalysis
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    GAS TUNGSTEN ARC WELDS
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    Microstructural characterization
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    WELD FUSION ZONES
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    Electric arc welding