tem study of high-temperature precipitation of delta phase in inconel 718 alloy

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ID: 254725
2011
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Abstract
Inconel 718 is widely used because of its ability to retain strength at up to 650โˆ˜C for long periods of time through coherent metastable ๐›พ๎…ž๎…ž Ni3Nb precipitation associated with a smaller volume fraction of ๐›พ๎…ž Ni3Al precipitates. At very long ageing times at service temperature, ๐›พ๎…ž๎…ž decomposes to the stable Ni3Nb ๐›ฟ phase. This latter phase is also present above the ๐›พ๎…ž๎…ž solvus and is used for grain control during forging of alloy 718. While most works available on ๐›ฟ precipitation have been performed at temperatures below the ๐›พ๎…ž๎…ž solvus, it appeared of interest to also investigate the case where ๐›ฟ phase precipitates directly from the fcc matrix free of ๐›พ๎…ž๎…ž precipitates. This was studied by X-ray diffraction and transmission electron microscopy (TEM). TEM observations confirmed the presence of rotation-ordered domains in ๐›ฟ plates, and some unexpected contrast could be explained by double diffraction due to overlapping phases.
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Authors ;Moukrane Dehmas;Jacques Lacaze;Aliou Niang;Bernard Viguier
Journal bulletin of the korean chemical society
Year 2011
DOI
10.1155/2011/940634
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