Effect of environment on notch fatigue initiation resistance in CMSX4


Reed, P.A.S. and Miller, M.D. (2005) Effect of environment on notch fatigue initiation resistance in CMSX4. TMS Letters, 2, (1), 27-28.

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Description/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 closeto-surface pores - indicating that surface oxidation is infilling/"healing" surface pores or providing significant local stress transfer to shift initiation to sub-surface pores

Item Type: Article
Additional Information: This issue comprises previously unpublished research from the 2005 TMS Annual Meeting, which was held 13-17 Feb, San Francisco, USA.
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Subjects: T Technology > TN Mining engineering. Metallurgy
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences
ePrint ID: 23320
Date Deposited: 12 Mar 2007
Last Modified: 27 Mar 2014 18:12
URI: http://eprints.soton.ac.uk/id/eprint/23320

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