Effect of temperature and secondary orientation on notch fatigue resistance of CMSX4
Effect of temperature and secondary orientation on notch fatigue resistance of CMSX4
A turbine blade root contains notches that locate into a “fir-tree” root fixing in the turbine disc. Fatigue initiation in these stress concentrating features is of some concern. When a turbine blade is cast, the primary orientation along the blade is controlled (usually in the <001> direction) to within certain limits, however the secondary orientation (i.e. the orientation of any notches) is not generally controlled. The notch fatigue crack initiation and growth behaviour of CMSX-4 under low cycle fatigue conditions has been investigated at 650°C and 725°C. Two secondary orientations have been investigated and a separate oxidation study has been conducted. Heavy oxidation is observed in the notch root after a short amount of time at 650°C. At high temperatures, crack initiation occurs at subsurface pores.
Miller, M.
1d3ece62-0f07-44fc-8198-5ae9d8ab2b0d
Reed, P.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Joyce, M.
6175296e-1478-408a-8a5e-962981489936
2005
Miller, M.
1d3ece62-0f07-44fc-8198-5ae9d8ab2b0d
Reed, P.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Joyce, M.
6175296e-1478-408a-8a5e-962981489936
Miller, M., Reed, P. and Joyce, M.
(2005)
Effect of temperature and secondary orientation on notch fatigue resistance of CMSX4.
International Journal of Fatigue.
Abstract
A turbine blade root contains notches that locate into a “fir-tree” root fixing in the turbine disc. Fatigue initiation in these stress concentrating features is of some concern. When a turbine blade is cast, the primary orientation along the blade is controlled (usually in the <001> direction) to within certain limits, however the secondary orientation (i.e. the orientation of any notches) is not generally controlled. The notch fatigue crack initiation and growth behaviour of CMSX-4 under low cycle fatigue conditions has been investigated at 650°C and 725°C. Two secondary orientations have been investigated and a separate oxidation study has been conducted. Heavy oxidation is observed in the notch root after a short amount of time at 650°C. At high temperatures, crack initiation occurs at subsurface pores.
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Published date: 2005
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Local EPrints ID: 23318
URI: http://eprints.soton.ac.uk/id/eprint/23318
ISSN: 0142-1123
PURE UUID: 451ba3e6-aecc-4d28-afe5-ac649906c06c
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Date deposited: 04 May 2007
Last modified: 16 Mar 2024 02:44
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Author:
M. Miller
Author:
M. Joyce
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