Investigation of fatigue crack initiation in Ti-6Al-4V during tensile-tensile fatigue

Fatigue crack initiation in Ti-6Al-4V has been investigated in high cycle fatigue (HCF) and low cycle fatigue (LCF) regimes at stress ratio R = 0.1 using the replication technique. In all four tested alpha/beta microstructures, the crack was initiated by fracture of equiaxed alpha grain. Fractured a...

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Published in:Journal of materials engineering and performance 2002-04, Vol.11 (2), p.226-231
Main Authors: IVANOVA, Svetlana G, BLEDERMAN, Ronald R, SISSON, Richard D
Format: Article
Language:English
Subjects:
Applied sciences
Cleavage
Crack initiation
Crack propagation
Exact sciences and technology
Fatigue
Fatigue failure
Fracture mechanics
Grains
Low cycle fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Titanium base alloys
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BLEDERMAN, Ronald R
SISSON, Richard D
description Fatigue crack initiation in Ti-6Al-4V has been investigated in high cycle fatigue (HCF) and low cycle fatigue (LCF) regimes at stress ratio R = 0.1 using the replication technique. In all four tested alpha/beta microstructures, the crack was initiated by fracture of equiaxed alpha grain. Fractured alpha grains are seen on the fracture surface as flat facets with features characteristic of cleavage fracture. In the regime of low stress amplitudes and in the absence of reverse loading, cleavage fracture contributes to crack initiation and early stages of crack growth in Ti-6Al-4V. This mechanism is discussed in relation to the anomalous mean stress fatigue behavior exhibited by this alloy. (Author)
doi_str_mv 10.1361/105994902770344312
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In all four tested alpha/beta microstructures, the crack was initiated by fracture of equiaxed alpha grain. Fractured alpha grains are seen on the fracture surface as flat facets with features characteristic of cleavage fracture. In the regime of low stress amplitudes and in the absence of reverse loading, cleavage fracture contributes to crack initiation and early stages of crack growth in Ti-6Al-4V. This mechanism is discussed in relation to the anomalous mean stress fatigue behavior exhibited by this alloy. 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subjects Applied sciences
Cleavage
Crack initiation
Crack propagation
Exact sciences and technology
Fatigue
Fatigue failure
Fracture mechanics
Grains
Low cycle fatigue
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Titanium base alloys
title Investigation of fatigue crack initiation in Ti-6Al-4V during tensile-tensile fatigue
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