Structural characterization of the aged Inconel 718
Identifieur interne : 000B42 ( Main/Merge ); précédent : 000B41; suivant : 000B43Structural characterization of the aged Inconel 718
Auteurs : C. Slama [Tunisie] ; M. Abdellaoui [Tunisie]Source :
- Journal of Alloys and Compounds [ 0925-8388 ] ; 2000.
Abstract
The aging of the NC 19 Fe Nb alloy (Inconel 718), previously quenched from 990°C, is characterized by X-ray diffraction, transmission electron microscopy and micro-hardness investigation. The X-ray diffraction patterns reveal the co-existence of the simple cubic, the tetragonal and the orthorhombic structures. These structures correspond respectively to the γ′, γ″ and δ phases. A detailed study of each XRD pattern gives the lattice parameter and the crystalline grain size of the existing phases. TEM observations on thin foils have led to identification of the different phases responsible for the various hardening stages occurring during isothermal tempering performed at 680 and 750°C temperatures for 4, 50 and 100 h. The γ′ and γ″ phase precipitation are strongly dependent on the aging temperature and time. For 680°C aging temperature, hardness investigations show that a first hardening (HV=450) occurs when the duration is about 4 h (the γ′ particle size given by TEM observation is about 5–6 nm). A second hardening (HV=500) was shown to occur at 50 h. It corresponds to the precipitation of the γ″ phase perfectly coherent with the γ matrix. For 750°C aging temperature, the γ″ phase precipitation (coherent with the matrix and the disc shaped with a length of 30 nm) produces a fast hardening after 4 h (HV=466). For a longer thermal exposure, the orthorhombic δ phase appears, reaching a high grain size and fraction volume after 100 h and leading to a drastic microhardness decrease. From 30 nm on, the tetragonal distortion of the γ″ particles increases with increasing precipitate size.
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DOI: 10.1016/S0925-8388(00)00789-1
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