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Evaluation of the Stability of Raft Structure in Nickel Base Superalloys Throughout their Lifetime

Published online by Cambridge University Press:  26 February 2011

Katsushi Tanaka ,
Toru Inoue ,
Tetsu Ichitsubo ,
Kyosuke Kishida  and
Haruyuki Inui
Katsushi Tanaka
Affiliation:
katsushi-tanaka@mtl.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Yoshidahon-machi,, Sakyo-ku,, Kyoto, 606-8501, Japan, 81-75-753-5461, 81-75-753-5461
Toru Inoue
Affiliation:
inouetoru@t02.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Yoshidahon-machi,, Sakyo-ku, Kyoto, 606-8501, Japan
Tetsu Ichitsubo
Affiliation:
tichi@mtl.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Yoshidahon-machi,, Sakyo-ku,, Kyoto, 606-8501, Japan
Kyosuke Kishida
Affiliation:
k.kishida@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Yoshidahon-machi,, Sakyo-ku,, Kyoto, 606-8501, Japan
Haruyuki Inui
Affiliation:
haruyuki.inui@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Yoshidahon-machi,, Sakyo-ku,, Kyoto, 606-8501, Japan
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Abstract

Stability of raft structure in nickel base superalloys has been examined by using elastic energy calculations based on a microelasticity theory. The numerical calculation method for a structurally heterogeneous system is applied. The results indicate that the raft structure is significantly stabilized by introductions of creep deformations till the critical creep deformation at which the lattice misfit between gamma and gamma-prime phases is completely compensated by creep dislocations. When the magnitude of creep deformations exceed the critical value, the (001) lamellar interfaces become elastically unstable and a tilted lamellar interface become the most stable one. This instability of the 001 raft structure leads a tilted or wavy lamellar interfaces for reducing the internal strain energy, that is a precursor to collapse the raft structure.

Keywords

structuralmicrostructureelastic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II08-08
Copyright
Copyright © Materials Research Society 2007

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References

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