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Title: Increase of misfit during creep of superalloys and its correlation with deformation

Abstract

In superalloys the loss of coherency during creep results in the increase of misfit of the {gamma}/{gamma}{prime}-interface. The kinetics of this process were measured locally by TEM (Moire fringes) and X-ray diffraction. Two materials were creep tested (SRR99 and CMSX-4) in two temperature ranges (stable {gamma}{prime}-morphology and rafting), and the morphology changes were quantified. A microstructural model allows calculation of the equilibrium misfit and the increase of plastic strain on the basis of these data. At high temperatures and low stresses the model describes quantitatively creep kinetics up to 30 h. Here the processes controlling primary creep are propagation of dislocation loops along matrix channels and thickening of the matrix channels oriented perpendicular to the load direction.

Authors:
; ; ;
Publication Date:
Research Org.:
Technische Univ. Berlin (DE)
OSTI Identifier:
20075948
Resource Type:
Journal Article
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 48; Journal Issue: 8; Other Information: PBD: 11 May 2000; Journal ID: ISSN 1359-6454
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CREEP; HEAT RESISTING ALLOYS; INTERFACES; KINETICS; DISLOCATIONS; ELECTRON MICROSCOPY; X-RAY DIFFRACTION; MATHEMATICAL MODELS

Citation Formats

Link, T., Epishin, A., Brueckner, U., and Portella, P. Increase of misfit during creep of superalloys and its correlation with deformation. United States: N. p., 2000. Web. doi:10.1016/S1359-6454(99)00456-5.
Link, T., Epishin, A., Brueckner, U., & Portella, P. Increase of misfit during creep of superalloys and its correlation with deformation. United States. doi:10.1016/S1359-6454(99)00456-5.
Link, T., Epishin, A., Brueckner, U., and Portella, P. Thu . "Increase of misfit during creep of superalloys and its correlation with deformation". United States. doi:10.1016/S1359-6454(99)00456-5.
@article{osti_20075948,
title = {Increase of misfit during creep of superalloys and its correlation with deformation},
author = {Link, T. and Epishin, A. and Brueckner, U. and Portella, P.},
abstractNote = {In superalloys the loss of coherency during creep results in the increase of misfit of the {gamma}/{gamma}{prime}-interface. The kinetics of this process were measured locally by TEM (Moire fringes) and X-ray diffraction. Two materials were creep tested (SRR99 and CMSX-4) in two temperature ranges (stable {gamma}{prime}-morphology and rafting), and the morphology changes were quantified. A microstructural model allows calculation of the equilibrium misfit and the increase of plastic strain on the basis of these data. At high temperatures and low stresses the model describes quantitatively creep kinetics up to 30 h. Here the processes controlling primary creep are propagation of dislocation loops along matrix channels and thickening of the matrix channels oriented perpendicular to the load direction.},
doi = {10.1016/S1359-6454(99)00456-5},
journal = {Acta Materialia},
issn = {1359-6454},
number = 8,
volume = 48,
place = {United States},
year = {2000},
month = {5}
}