Dear Spiral user, We’re pleased to introduce Helix, https://helix.imperial.ac.uk/ Imperial’s new repository for research datasets. Please use Helix for all future dataset deposits. There is no change to Spiral - continue depositing as usual. For queries, contact the Research Data Management team at rdm-enquiries@imperial.ac.uk. Kind regards, the Spiral Team. The Spiral team
On the mechanistic basis of fatigue crack nucleation in Ni superalloy containing inclusions using high resolution electron backscatter diffraction
File(s)
Author(s)
Jiang, J
Yang, J
Zhang, T
Dunne, FPE
Britton, TB
Type
Journal Article
Abstract
A series of interrupted three-point bend low-cycle fatigue tests were carried out on a powder metallurgy FHG96 nickel superalloy sample containing non-metallic inclusions. High resolution electron backscatter diffraction (HR-EBSD) was used to characterise the distribution and evolution of geometrically necessary dislocation (GND) density, residual stress and total dislocation density near a non-metallic inclusion. A systematic study of room temperature cyclic deformation is presented in which slip localisation, cyclic hardening, ratcheting and stabilisation occur, through to crack formation and microstructurally-sensitive propagation. Particular focus is brought to bear at the inclusion–matrix interface. Complex inhomogeneous deformation structures were directly observed from the first few loading cycles, and these structures were found not to vary significantly with increasing number of cycles. A clear link was observed between crack nucleation site and microstructurally-sensitive growth path and the spatially-resolved sites of extreme values of residual stress and GND density.
Date Issued
2015-07-14
Date Acceptance
2015-06-16
Citation
Acta Materialia, 2015, 97, pp.367-379
URI
DOI
ISSN
1873-2453
Publisher
Elsevier
Start Page
367
End Page
379
Journal / Book Title
Acta Materialia
Volume
97
Copyright Statement
© 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Subjects
Science & Technology
Technology
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Materials Science
EBSD
Fatigue crack formation
Geometrically necessary dislocations
Residual stress
Ni superalloy with inclusion
DISLOCATION DENSITY DISTRIBUTIONS
CRYSTAL PLASTICITY
ELASTIC STRAIN
LATTICE ROTATIONS
INTERNAL-STRESSES
GRAIN-BOUNDARIES
COPPER
MICROSTRUCTURE
DEFORMATION
POLYCRYSTALLINE
Publication Status
Published