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High temperature mechanical properties of cryogenically cooled alloy 718 weldments
Published in Taylor and Francis Ltd.
2016
Volume: 33
   
Issue: 3
Pages: 257 - 269
Abstract
Abstract: The micro-segregation of niobium and Laves phase formation during Gas Tungsten Arc (GTA) welding of alloy 718 were studied by employing different cooling techniques which resulted in weld cooling rates ranging from 43.2 °C/s to 508.7 °C/s. The weld cooling rates were achieved by the combinations of modified pulse wave form, argon and helium shielding gases, copper heat sink and liquid nitrogen cooling. A combination of compound current pulse (CCP) waveform with helium shielding and liquid nitrogen cooling resulted in lesser niobium segregation and discontinuous, finer Laves particles in the interdendritic regions compared to that of the conventional constant current GTA weld metal. This process yielded better ageing response and improved high temperature mechanical properties of the weldments. © 2016 Informa UK Limited, trading as Taylor & Francis Group.
About the journal
JournalData powered by TypesetMaterials at High Temperatures
PublisherData powered by TypesetTaylor and Francis Ltd.
ISSN09603409
Open AccessNo
Concepts (20)
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    Cooling
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    Helium
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    Liquid nitrogen
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    Liquids
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    Mechanical properties
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    Niobium
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    Niobium compounds
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    Segregation (metallography)
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    Shielding
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    Tensile strength
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    Welds
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    ALLOY 718
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    DIRECT AGEING
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    Gas tungsten arc welding
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    HIGH TEMPERATURE MECHANICAL PROPERTIES
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    INTERDENDRITIC REGIONS
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    LAVES-PHASE
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    Liquid-nitrogen cooling
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    NIOBIUM SEGREGATION
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    Nitrogen