Effect of environment on notch fatigue resistance of CMSX4

Miller, M.D., Reed, P.A.S., Joyce, M.R., Henderson, M.B., Brooks, J.W., Wilcock, I. and Wu, X. (2007) Effect of environment on notch fatigue resistance of CMSX4 Materials Science and Technology, 23, (12), pp. 1439-1445. (doi:10.1179/174328407X213198).


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Crack nucleation/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 nucleation/initiation occurred at subsurface interdendritic pores in all cases. The subsurface crack grows initially under vacuum conditions, before breaking out to the top surface. Lifetime is then dependent on initiating pore size and distance from the notch root surface. In vacuum conditions, crack nucleation/initiation has been observed more consistently from surface or close-to-surface pores, indicating that surface oxidation is in-filling/‘healing’ surface pores or providing significant local stress transfer to shift initiation to subsurface pores.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1179/174328407X213198
ISSNs: 0267-0836 (print)
Keywords: CMSX4, fatigue initiation, environment, pores, crack nucleation
Organisations: Engineering Mats & Surface Engineerg Gp
ePrint ID: 65057
Date :
Date Event
December 2007Published
Date Deposited: 29 Jan 2009
Last Modified: 16 Apr 2017 17:16
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/65057

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