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Delta phase precipitation in inconel 718
Luleå tekniska universitet.
2004 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 53, no 1, p. 7-16Article in journal (Refereed) Published
Abstract [en]

The precipitation and dissolution kinetics of the δ-phase were studied in three wrought versions and one spray-formed (SF) version of the nickel alloy, Inconel 718. The precipitation in the spray-formed version and one wrought version was followed during isothermal ageing for up to 100 h between 700 and 1000°C. The δ-phase precipitates in the form of nonuniformly distributed thin platelets and an alternative method of measuring volume fraction of this precipitate morphology is proposed. At and above 800°C, the precipitation was measured quantitatively in terms of the volume fraction and platelet thickness distribution. The maximum rate of precipitation occurred at approximately 900°C. The solvus temperature lay between 1005 and 1015°C for Nb contents of 5.06 and 5.41 wt.%, respectively. A study was made of the dissolution of the δ-phase in all four alloys using isochronal treatments and this confirmed the above solvus temperature range. The effect of δ-phase and its dissolution on the grain growth of the alloys was also determined.

Place, publisher, year, edition, pages
2004. Vol. 53, no 1, p. 7-16
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-6073DOI: 10.1016/j.matchar.2004.07.004Local ID: 445e4490-f330-11db-ac9f-000ea68e967bOAI: oai:DiVA.org:ltu-6073DiVA: diva2:978950
Note
Validerad; 2004; 20070425 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-21Bibliographically approved

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