Precipitate evolution in the early stages of ageing in Inconel 718 investigated using small-angle x-ray scattering

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Precipitate evolution in the early stages of ageing in Inconel 718 investigated using small-angle x-ray scattering

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Publication Article, peer reviewed scientific
Title Precipitate evolution in the early stages of ageing in Inconel 718 investigated using small-angle x-ray scattering
Author(s) Fisk, Martin ; Andersson, Joel ; du Rietz, Richard ; Haas, Sylvio ; Hall, Stephen
Date 2014
English abstract
Microstructural evolution during the early stages of ageing (less than one hour) in a Ni–Cr–Fe based superalloy Inconel 718 (IN718) has been investigated using Small-Angle X-ray Scattering (SAXS). The effects of precipitate kinetics on the precipitate size distribution are compared indirectly with SAXS measurements by using Vickers microhardness data. The microhardness increased after 4 min of ageing at a temperature of 760 °C, although the recorded SAXS data did not reveal the precipitate size distribution. This indicates that the precipitates had not evolved enough to be detected, but still a small number of precipitates increased the yield strength. After ageing the alloy for the shortest period for which data were available, 8 min, clear evidence of precipitates could be found from the SAXS data, showing that the γ″-γ″- precipitates are about 6 nm in width and 3 nm in height.
DOI http://dx.doi.org/10.1016/j.msea.2014.06.036 (link to publisher's fulltext)
Publisher Elsevier
Host/Issue Materials Science and Engineering : A;
Volume 612
ISSN 0921-5093
Pages 202-207
Language eng (iso)
Subject(s) SAXS
Vickers microhardness
Nickel based superalloys
Age hardening
IN718
Humanities/Social Sciences
Research Subject Categories::TECHNOLOGY
Handle http://hdl.handle.net/2043/19966 (link to this page)

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