The effect of environment and orientation on fatigue crack growth behaviour of CMSX-4 nickel base single crystal at 650 °C
The effect of environment and orientation on fatigue crack growth behaviour of CMSX-4 nickel base single crystal at 650 °C
The fatigue behaviour of nickel base single crystal CMSX4 at 650 °C in air and vacuum has been investigated for two orientations with differing nominal crack propagation orientations but the same (001) tensile axis. The orientation containing a 110 crack growth direction shows better fatigue crack propagation resistance. This has been linked to differing orientations and amounts of interdendritic porosity (giving increased crack path roughness and shielding) increased stiffness along the crack growth direction (with implications for shear band decohesion) and lower resolved shear stresses along active slip systems, limiting faster Stage I crack growth. Faster crack growth rates are generally seen in vacuum compared with air, indicating the homogeneising effect of oxidation on slip, suppressing faster Stage I crack growth and possibly increasing oxidation-induced closure. The results of this study indicate that the effect of secondary orientation and environment in single crystal components will affect both failure mode and fatigue crack propagation rates.
fatigue, nickel base, single crystals, orientation, environment, crack propagation
99-103
Joyce, M.R.
e294d1ba-c37a-4149-b9c0-15095d643d3b
Wu, X.
b6ec2d37-5357-42db-a350-a73969909549
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
2004
Joyce, M.R.
e294d1ba-c37a-4149-b9c0-15095d643d3b
Wu, X.
b6ec2d37-5357-42db-a350-a73969909549
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Joyce, M.R., Wu, X. and Reed, P.A.S.
(2004)
The effect of environment and orientation on fatigue crack growth behaviour of CMSX-4 nickel base single crystal at 650 °C.
Materials Letters, 58 (1-2), .
(doi:10.1016/S0167-577X(03)00423-3).
Abstract
The fatigue behaviour of nickel base single crystal CMSX4 at 650 °C in air and vacuum has been investigated for two orientations with differing nominal crack propagation orientations but the same (001) tensile axis. The orientation containing a 110 crack growth direction shows better fatigue crack propagation resistance. This has been linked to differing orientations and amounts of interdendritic porosity (giving increased crack path roughness and shielding) increased stiffness along the crack growth direction (with implications for shear band decohesion) and lower resolved shear stresses along active slip systems, limiting faster Stage I crack growth. Faster crack growth rates are generally seen in vacuum compared with air, indicating the homogeneising effect of oxidation on slip, suppressing faster Stage I crack growth and possibly increasing oxidation-induced closure. The results of this study indicate that the effect of secondary orientation and environment in single crystal components will affect both failure mode and fatigue crack propagation rates.
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Published date: 2004
Keywords:
fatigue, nickel base, single crystals, orientation, environment, crack propagation
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Local EPrints ID: 22414
URI: http://eprints.soton.ac.uk/id/eprint/22414
ISSN: 0167-577X
PURE UUID: 5d484aa9-bc8a-4813-9967-4742eb4e9d97
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Date deposited: 22 Mar 2006
Last modified: 16 Mar 2024 02:44
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Author:
M.R. Joyce
Author:
X. Wu
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