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

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    0105612 - UJF-V 20043171 RIV US eng J - Journal Article
    Mukherji, D. - Strunz, Pavel - del Genovese, D. - Gilles, R. - Rösler, J. - Wiedenmann, A.
    Investigation of microstructural changes in INCONEL 706 at high temperatures by In-situ small-angle neutron scattering.
    [Studium změn mikrostruktury INCONEL706 při vysokých teplotách pomocí.]
    Metallurgical and Materials Transactions A. 34A, č. 12 (2003), s. 2781-2792. ISSN 1073-5623. E-ISSN 1543-1940
    R&D Projects: GA ČR GA106/02/0557
    Institutional research plan: CEZ:AV0Z1048901
    Keywords : alloys * SANS
    Subject RIV: BM - Solid Matter Physics ; Magnetism
    Impact factor: 1.285, year: 2003

    The Ni-Fe based superalloy INCONEL 706 (IN706) has a complex microstructure and many A(3)B type phases, e.g., Ni3Al gamma', Ni3Nb gamma', Ni3Nb delta, or Ni3Ti 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.

    Bylo provedeno in-situ monitorování vývoje mikrostruktury precipitátů v superslitině pomocí maloúhlového rozptylu neutronů. Bylo ukázáno, že fáze eta a gamma' se vznikají při vysokých teplotách přímo z matrice.
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