An investigation on fatigue and dwell-fatigue crack growth in Ti–6Al–2Sn–4Zr–2Mo–0.1Si

Shen, W.; Soboyejo, W. O.; Soboyejo, Alfred

doi:10.1016/s0167-6636(03)00035-8

Cited by 30 publications

(11 citation statements)

References 22 publications

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“…[11] They find no significant differences in the fracture topography between these two test conditions. They do report, however, the well-known transition from faceted growth to striation growth with increasing ⌬K.…”

Section: B Fractography and Failure Modesmentioning

confidence: 93%

Understanding the contributions of normal-fatigue and static loading to the dwell fatigue in a near-alpha titanium alloy

Sinha

Mills

Williams

2004

Metall Mater Trans A

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This article presents the results of a recent study of the response of an ␣/␤-forged Ti-6Al-2Sn-4Zr-2Mo alloy during static, normal-fatigue, and dwell-fatigue loading. The plastic-strain accumulation under different loading conditions is reported. The failure modes and associated fractographic features under static, normal-fatigue, and dwell-fatigue loading conditions are also discussed. These results are used to obtain a better understanding of the relative contributions of the cyclic and creep processes to the overall damage under dwell-fatigue conditions.

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Section: B Fractography and Failure Modesmentioning

confidence: 93%

Understanding the contributions of normal-fatigue and static loading to the dwell fatigue in a near-alpha titanium alloy

Sinha

Mills

Williams

2004

Metall Mater Trans A

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“…The prior research on titanium alloys attributes dwell sensitivity to many deleterious mechanisms. These mechanisms involved many factors, such as timedependent strain accumulation [4][5][6], microstructure and micro-texture influences [1,[7][8][9], stress ratio effects [10,11], internal hydrogen content [12,13] and environmental effects [14,15], crystallographic orientation dependence [5,16], interactions between creep and fatigue [17]. However, there is no consensus on the basic cause of the dwell-fatigue sensitivity of titanium alloys.…”

Section: List Of Symbolsmentioning

confidence: 99%

Prediction of Cold Dwell-Fatigue Crack Growth of Titanium Alloys

Wang

Cui

et al. 2015

Acta Metall. Sin. (Engl. Lett.)

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The dwell effect of the material can reduce the fatigue lives of titanium alloys at room temperature. A unified fatigue life prediction method developed by the authors' group is modified in this paper to predict dwell-fatigue crack growth taking into account the effects of dwell time and maximum stress. The modified model can be successfully used to predict the crack growth rate and calculate the fatigue life of different titanium alloys under pure fatigue and dwell-fatigue conditions. It is validated by comparing prediction results with the experimental data of several titanium alloys with different microstructures, dwell time, hydrogen contents, stress ratios and stress levels.

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“…As mentioned by Brandes, [9] there are contradicting reports in the literature on the effect of dwell periods on fatigue crack propagation rates. [15,26,[69][70][71][72][73][74] Some researchers find increased crack growth rates, whereas others measure no difference, and some even find reduced growth rates. The relevance of these studies has been called into question, [9] however, because they generally focused on long cracks growing in air as opposed to internally initiated cracks that are not surface connected, which are growing in a vacuum.…”

Section: A Phenomenological Model For Dwell Fatigue Crack Initiationmentioning

confidence: 99%

Observations of Facet Formation in Near-α Titanium and Comments on the Role of Hydrogen

Pilchak

Williams

2010

Metall Mater Trans A

151

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Faceted features are frequently observed on the fracture surfaces of titanium alloys that have failed by static loading, continuous cycling, dwell fatigue loading, and stress corrosion cracking (SCC). Although the facets formed under different loading conditions seem qualitatively similar, there are significant differences in the spatial and crystallographic orientations of the facets as well as subtle differences in facet surface topography. The current study compares and contrasts facets for various loading conditions (cyclic, creep, SCC, and dwell) in the Ti-8Al-1Mo-1V alloy with the primary motivation being to understand the mechanisms of crack initiation and faceted growth during dwell fatigue. The spatial and crystallographic orientations of the facets were determined using quantitative tilt fractography and electron backscatter diffraction, whereas facet topography was examined using ultra-high-resolution scanning electron microscopy. Collectively, the experimental observations suggest that hydrogen may play an important role in facet formation and accelerating small crack growth rates during dwell fatigue loading.

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An investigation on fatigue and dwell-fatigue crack growth in Ti–6Al–2Sn–4Zr–2Mo–0.1Si

Cited by 30 publications

References 22 publications

Understanding the contributions of normal-fatigue and static loading to the dwell fatigue in a near-alpha titanium alloy

Understanding the contributions of normal-fatigue and static loading to the dwell fatigue in a near-alpha titanium alloy

Prediction of Cold Dwell-Fatigue Crack Growth of Titanium Alloys

Observations of Facet Formation in Near-α Titanium and Comments on the Role of Hydrogen

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