Early Instability Phenomena of IN792 DS Superalloy

Roberto Montanari; Oriana Tassa; Alessandra Varone

doi:10.4028/www.scientific.net/MSF.879.2026

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HomeMaterials Science ForumMaterials Science Forum Vol. 879Early Instability Phenomena of IN792 DS Superalloy

Early Instability Phenomena of IN792 DS Superalloy

Abstract:

Microstructure stability of the directionally solidified Ni base IN792 superalloy has been investigated by Mechanical Spectroscopy (MS), i.e. internal friction (IF) and dynamic modulus measurements. Repeated IF test runs from room temperature to 1173 K have been carried out on the same samples and a Q^-1 maximum has been always observed above 700 K. Its position does not depend on the resonance frequency. After each run the values of modulus and Q^-1 at room temperature change indicating that a progressive irreversible transformation occurs. Damping phenomena have been attributed to the rearrangement of dislocation structures in disordered matrix which modifies dislocation density and average distance of pinning points. The results are supported by X-ray diffraction (XRD) and transmission electron microscopy (TEM) observations.

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Periodical:

Materials Science Forum (Volume 879)

Pages:

2026-2031

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.879.2026

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Online since:

November 2016

Authors:

Roberto Montanari, Oriana Tassa, Alessandra Varone*

Keywords:

Dislocation Structure, Dynamic Modulus, Internal Friction, Ni Base Superalloy, Structure Instability

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References

[1] H. Monjati, M. Jahazi, R. Bahrami, S. Yue, Mater. Sci. & Eng. A, 373 (2004) 286-293.

Google Scholar

[2] S. Zhao, X. Xie, G.D. Smith, S.J. Patel, Mater. Lett., 58 (2004) 1784-1787.

Google Scholar

[3] A.M. Ges, O. Fornaro, H.A. Palacio, Mater. Sci. & Eng. A, 458 (2007) 96-100.

Google Scholar

[4] P. Gadaud, K. Chakib, Mater. Sci. Forum, Vol. 119-121 (1993) pp.397-400.

Google Scholar

[5] W. Hermann, Th.V. Ort, H.G. Sockel, J. de Physique III, Vol. 6 (1996) C8-223-226.

Google Scholar

[6] A. Mourisco, N. Baluc, J. Bonneville, R. Schaller, J. de Physique III, Vol. 6 (1996) C8-235-238.

DOI: 10.1051/jp4:1996850

Google Scholar

[7] A. Mourisco, N. Baluc, J. Bonneville, R. Schaller, Mater. Sci. & Eng. A, 239-240 (1997) 281-286.

Google Scholar

[8] P. Gadaud, A. Rivière, J. de Physique III, Vol. 6 (1996) C8-867-870.

Google Scholar

[9] E. Bonetti, E.G. Campari, A. Casagrande, L. Pasquini, E. Sampaolesi, J. of Alloys and Compounds, 310 (2000) 351-355.

DOI: 10.1016/s0925-8388(00)00950-6

Google Scholar

[10] M. Weller, M. Hirscher, E. Schweitzer, H. Kronmüller, J. de Physique III, Vol. 6 (1996) C8-231-234.

Google Scholar

[11] S. Amadori, E.G. Campari, A.L. Fiorini, R. Montanari, L. Pasquini, L. Savini, E. Bonetti, Mater. Sci. & Eng. A, 442 (2006) 543-546.

DOI: 10.1016/j.msea.2006.02.210

Google Scholar

[12] A.S. Nowick, B.S. Berry, Anelastic Relaxation in Crystalline Solids, Academic Press, New York and London, 1972, p.415.

Google Scholar

[13] P. Deodati, R. Montanari, O. Tassa, N. Ucciardello, Mater. Sci. & Eng. A, 521-522 (2009) 102-105.

Google Scholar