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Fatigue and fracture of a 316 stainless steel metal matrix composite reinforced with 25% titanium diboride

Bacon, D.H.; Edwards, L.; Moffatt, J. E. and Fitzpatrick, M. E. (2013). Fatigue and fracture of a 316 stainless steel metal matrix composite reinforced with 25% titanium diboride. International Journal of Fatigue, 48 pp. 39–47.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.ijfatigue.2012.09.016
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Abstract

Fatigue and fracture mechanisms have been studied in a steel-based metal matrix composite (MMC), comprising a 316L austenitic matrix reinforced with 25 wt% particulate titanium diboride (TiB2). The fracture toughness was determined in the as-HIPped condition as being slightly below 30 MPa√m. Fatigue crack growth rates have been determined, and corrected for the effects of crack closure. The fracture surfaces have been studied to determine the mechanisms of damage during crack advance, which are determined as matrix fatigue, reinforcement particle fracture, and ductile rupture of the matrix. We show that the occurrence of damage mechanisms during fatigue of the material is linked to Kmax, rather than to ∆K. This is rationalised in terms of a semi-cohesive process zone within the monotonic plastic zone ahead of the crack tip.

Item Type: Journal Item
Copyright Holders: 2012 Elsevier Ltd
ISSN: 0142-1123
Keywords: metal matrix composites; fatigue crack growth; particle fracture; fracture surface analysis
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM)
Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Item ID: 35760
Depositing User: Michael E. Fitzpatrick
Date Deposited: 13 Dec 2012 09:46
Last Modified: 02 Nov 2017 15:06
URI: http://oro.open.ac.uk/id/eprint/35760
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