TY - JOUR
T1 - Fatigue and fracture of a 316 stainless steel metal matrix composite reinforced with 25% titanium diboride
AU - Bacon, D. H.
AU - Edwards, L.
AU - Moffatt, J. E.
AU - Fitzpatrick, M. E.
PY - 2013
Y1 - 2013
N2 - 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 MPap√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 ΔK. This is rationalised in terms of a semi-cohesive process zone within the monotonic plastic zone ahead of the crack tip.
AB - 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 MPap√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 ΔK. This is rationalised in terms of a semi-cohesive process zone within the monotonic plastic zone ahead of the crack tip.
KW - Fatigue crack growth
KW - Fracture surface analysis
KW - Metal matrix composites
KW - Particle fracture
UR - http://www.scopus.com/inward/record.url?scp=84883655920&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2012.09.016
DO - 10.1016/j.ijfatigue.2012.09.016
M3 - Article
AN - SCOPUS:84883655920
VL - 48
SP - 39
EP - 47
JO - International Journal of Fatigue
JF - International Journal of Fatigue
SN - 0142-1123
ER -