Mechanistic fatigue in Ni-based superalloy single crystals: a study of crack paths and growth rates
Author(s)
Karamitros, Vasilis
MacLachlan, Duncan W
Dunne, Fionn PE
Type
Journal Article
Abstract
The mechanistic basis of microstructurally short crack paths and growth rates is investigated in Ni-based superalloy single crystals using Crystal Plasticity (CP) and eXtended Finite Element (XFEM) analyses of experimental edge-cracked samples over a range of crystal orientations. Crack paths are determined to be those along crystallographic slip systems within which the slip is highest. Crack growth rates are determined by the crack tip critical stored energy density. Experimental observations of tortuous crack paths and their dependence on crystal orientation are reasonably well captured by the mechanistic model. Key features of alternating and straight crack paths are reproduced. The experimentally measured crack growth rates as a function of crystal orientation are also captured by the mechanistic model and controlled by the crack tip critical stored energy density which was found to be 385 Jm−2 in the Ni-based superalloy single crystals analysed. A new methodology for determination of critical stored energy density and mechanistic quantification of short crack growth rates is presented.
Date Issued
2022-01
Date Acceptance
2021-10-01
Citation
Journal of the Mechanics and Physics of Solids, 2022, 158
ISSN
0022-5096
Publisher
Elsevier
Journal / Book Title
Journal of the Mechanics and Physics of Solids
Volume
158
Copyright Statement
Copyright © Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000712088100008&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
Crystal plasticity
DRIVING-FORCE
FINITE-ELEMENT-METHOD
INITIATION
IN-SITU SEM
Materials Science
Materials Science, Multidisciplinary
Mechanics
MICROSTRUCTURE
Microstructure-sensitive fatigue
MODEL
Ni-based single crystals
ORIENTATION
Physical Sciences
Physics
Physics, Condensed Matter
PLASTICITY
PROPAGATION
Science & Technology
Short crack growth
Technology
TEMPERATURE
XFEM
Publication Status
Published
Article Number
104663
Date Publish Online
2021-10-09