Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 21, Issue 10, Pages 1132-1138Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1179/174328405X62260
Keywords
electron beam welding; Inconel 718; Laves phase; niobium segregation
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Bead on plate, full penetration electron beam welds were produced in 2 mm thickness sheets of Inconel 718 in the solution treated condition. Welds were subjected to an aging treatment with and without post-weld solution treatment. Weld microstructures, high temperature tensile properties and stress rupture properties were evaluated. The as welded fusion zone showed a considerable amount of interdendritic niobium segregation and brittle intermetallic Laves phase. The tensile and stress rupture properties of the welds after post-weld aging treatment were found to be inferior in relation to the base metal. Post-weld solution treatment at 980 degrees C was found to result in partial dissolution of Laves phase, some reduction in niobium segregation and the formation of 6 phase needles around the Laves particles. The use of 980 degrees C solution treatment was found to improve the weld properties to some extent, although not to the level of the base metal. The reasons for this behaviour are discussed, correlating microstructures, fracture features and mechanical properties.
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