Investigation of microstructural changes in INCONEL 706 at high temperatures by in-situ small-angle neutron scattering

The Ni-Fe based superalloy INCONEL 706 (IN706) has a complex microstructure and many A^sub 3^B type phases, e.g., Ni^sub 3^Al [gamma]', Ni^sub 3^Nb [gamma]'', Ni^sub 3^Nb [delta], or Ni^sub 3^Ti [eta] precipitates can form. The various precipitates can also have different morphologies...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2003-12, Vol.34 (12), p.2781-2792
Main Authors: MUKHERJI, D, STRUNZ, P, DEL GENOVESE, D, GILLES, R, RÖSLER, J, WIEDENMANN, A
Format: Article
Language:English
Subjects:
Alloys
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Heat treating
Materials science
Neutrons
Physics
Plating
Solid solution hardening, precipitation hardening, and dispersion hardening
aging
Solid solution, precipitation, and dispersion hardening
aging
Treatment of materials and its effects on microstructure and properties
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Summary:The Ni-Fe based superalloy INCONEL 706 (IN706) has a complex microstructure and many A^sub 3^B type phases, e.g., Ni^sub 3^Al [gamma]', Ni^sub 3^Nb [gamma]'', Ni^sub 3^Nb [delta], or Ni^sub 3^Ti [eta] precipitates can form. The various precipitates can also have different morphologies, i.e., plate, needle, cube, or disc shape, and some of them exist as co-precipitates-[gamma]'/[gamma]''. In the present study, in-situ measurements by small-angle neutron scattering (SANS) were performed to monitor the microstructural evolution at elevated temperatures. The SANS measurements were complemented by microstructural observations at room temperature by scanning electron microscopy and transmission electron microscopy (SEM and TEM). It is demonstrated that [eta] plates and [gamma]' needles form directly at high temperatures. Cooling from high temperature produces fine dispersions of [gamma]'/[gamma]'' precipitates, which coarsen on reheating to lower stabilization temperatures (893 and 993 K). The final morphology of the [gamma]'/[gamma]'' co-precipitates, i.e., compact/noncompact type very much depends on the stabilization temperature and the cooling rates from prior higher-temperature stabilization steps. [PUBLICATION ABSTRACT]
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-003-0179-9