Effect of environment on notch fatigue initiation resistance in CMSX4
Effect of environment on notch fatigue initiation resistance in CMSX4
Crack initiation at high temperatures has been studied in CMSX4 in both air and vacuum environments, to elucidate the effect of oxidation on the notch fatigue initiation process. In air, crack initiation occurred at sub-surface interdendritic pores in all cases. The sub-surface crack grows initially under vacuum conditions, before breaking out to the top surface. Lifetime is then critically dependent on initiating pore size and distance from the notch root surface. In vacuum conditions, crack initiation has been observed more consistently from surface or close-to-surface pores - indicating that surface oxidation is infilling/"healing" surface pores or providing significant local stress transfer to shift initiation to sub-surface pores.
27-28
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Miller, M.D.
0a80ae6f-550d-4bb4-9b64-a335270b8ae9
2005
Reed, P.A.S.
8b79d87f-3288-4167-bcfc-c1de4b93ce17
Miller, M.D.
0a80ae6f-550d-4bb4-9b64-a335270b8ae9
Reed, P.A.S. and Miller, M.D.
(2005)
Effect of environment on notch fatigue initiation resistance in CMSX4.
TMS Letters, 2 (1), .
Abstract
Crack initiation at high temperatures has been studied in CMSX4 in both air and vacuum environments, to elucidate the effect of oxidation on the notch fatigue initiation process. In air, crack initiation occurred at sub-surface interdendritic pores in all cases. The sub-surface crack grows initially under vacuum conditions, before breaking out to the top surface. Lifetime is then critically dependent on initiating pore size and distance from the notch root surface. In vacuum conditions, crack initiation has been observed more consistently from surface or close-to-surface pores - indicating that surface oxidation is infilling/"healing" surface pores or providing significant local stress transfer to shift initiation to sub-surface pores.
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Published date: 2005
Additional Information:
This issue comprises previously unpublished research from the 2005 TMS Annual Meeting, which was held 13-17 Feb, San Francisco, USA.
Venue - Dates:
TMS Spring Meeting, San Francisco, USA, 2005-02-01 - 2005-02-01
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Local EPrints ID: 23320
URI: http://eprints.soton.ac.uk/id/eprint/23320
PURE UUID: 38ea963c-a644-42a0-8fc7-f9342791b2ea
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Date deposited: 12 Mar 2007
Last modified: 12 Dec 2021 02:47
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Author:
M.D. Miller
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