Journal Published Online: 23 September 2022
Volume 11, Issue 1

Microstructural Evolution of Inconel 718 during Aging and Its Correlation with Electric Conductivity Measurements

CODEN: MPCACD

Abstract

The microstructural evolution of the nickel-base superalloy Inconel 718 after exposition at 750°C for different holding times (10 min–1,000 h) was characterized and correlated with the Eddy current (EC) technique. The results showed that electrical conductivity increases with aging time. This behavior was associated with the precipitation and coarsening of the metastable γ″ phase and its transformation into the detrimental δ phase after 100 h. EC nondestructive evaluation was correlated with X-ray diffraction patterns in terms of the precipitation and growth of secondary carbides that were observed in the scanning electron microscope. Vickers microhardness values were also in agreement with microstructural changes and EC measurements, as the maximum hardened condition can be associated with the precipitation of secondary phases before the transformation of the γ″ phase into the δ phase.

Author Information

Mata-Rodríguez, Marcos Ariel
Universidad Autónoma de Coahuila, Monclova, Coahuila, México
García-Rentería, Marco Arturo
Universidad Autónoma de Coahuila, Monclova, Coahuila, México
Ambríz-Rojas, Ricardo Rafael
Instituto Politécnico Nacional CIITEC-IPN, Azcapotzalco, Ciudad de México, México
Cabral-Miramontes, José Ángel
Universidad Autónoma de Nuevo León, San Nicolás de los Garza, Nuevo León, México
López-Morelos, Victor Hugo
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
Ramírez-López, Maria del Carmen
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
Curiel-López, Francisco Fernando
Instituto de Investigación en Metalurgia y Materiales, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, Michoacán, México
Pages: 11
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Stock #: MPC20220035
ISSN: 2379-1365
DOI: 10.1520/MPC20220035