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Microstructural Rejuvenation Through Non-conventional Heat Treatments of an Inconel 939 Superalloy

Published online by Cambridge University Press:  31 January 2012

M. A. González ,
D. I. Martínez ,
A. Pérez  and
H. Guajardo
M. A. González*
Affiliation:
Facultad de Ingeniería Mecánica y Eléctrica (FIME-UANL), Av. Universidad s/n. Ciudad Universitaria, C.P.66451 San Nicolás de los Garza, N.L., México.
D. I. Martínez
Affiliation:
Facultad de Ingeniería Mecánica y Eléctrica (FIME-UANL), Av. Universidad s/n. Ciudad Universitaria, C.P.66451 San Nicolás de los Garza, N.L., México.
A. Pérez
Affiliation:
Facultad de Ingeniería Mecánica y Eléctrica (FIME-UANL), Av. Universidad s/n. Ciudad Universitaria, C.P.66451 San Nicolás de los Garza, N.L., México.
H. Guajardo
Affiliation:
FRISA Aerospace, S.A. de C.V., Valentín G. Rivero No. 200, Col. Los Treviño, C.P. 66150, Santa Catarina N.L., México.
*
*E-mail: mgonzalez@comimsa.com.mx
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Abstract

The microstructural rejuvenation through non-conventional heat treatments (NCHT) of a conventional cast superalloy Inconel 939 was investigated. The primary and secondary main constituents of the NCHT microstructures were characterized through its morphology and composition applying conventional microscopy and analytical scanning electron microscope (SEM). The results showed a complete rejuvenation of the overage microstructure (disordered coarse cuboids of 1.2μm from γ´, continuous films of M23C6 carbides and coarse MC carbides as well as γ-γ´eutectics) into a more homogeneous microstructure; spherical ordered primary γ´ and secondary γ´ precipitates ranging between 357 to 442 nm and 30 to50 nm respectively and depending on the applied heat treatment. Also blocky type MC and discreet M23C6 carbides dispersed within the dendrite and in the interdendritic regions were observed. There was no evidence of the formation of detrimental phases with the NCHT, which can affect the long-term properties of the alloy during service.

Keywords

MicrostructureGrain boundariesScanning Electron Microscopy (SEM)Second phasesNialloy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1372: Symposium S3 – Structural and Chemical Characterization of Metal Alloys and Compounds—2011 , 2012 , imrc-1372-s3-24
Copyright
Copyright © Materials Research Society 2012

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