The effect of grain orientation on fracture morphology during high-cycle fatigue of Ti–6Al–4V

Bantounas, Ioannis; Dye, David; Lindley, T.C.

doi:10.1016/j.actamat.2009.04.018

Cited by 181 publications

(71 citation statements)

References 22 publications

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“…Both the lab. X-ray and EBSD texture measurement techniques show very similar results with the basal (0001) plane normals lying in the primary rolling (RD 1 ) and secondary rolling (RD 2 ) directions, which is consistent with previous work on a similar product [24], although the EBSD measurements of course suffer from poorer sampling statistics. Fig.…”

Section: As-receivedsupporting

confidence: 77%

In situ observation of texture and microstructure evolution during rolling and globularization of Ti–6Al–4V

Warwick¹,

Jones²,

Bantounas

et al. 2013

Acta Materialia

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The evolution of texture in β-annealed Ti-6Al-4V during α-β rolling and so-called recrystallisation annealing has been examined using synchrotron X-ray diffraction and ex-situ characterisation. During rolling, the initial α (0002) texture softens and the colony α becomes kinked. During globularisation, the texture strengthens as highly strained (and hence misoriented) areas of the laths disappear and this strengthening continues once coarsening of the primary α becomes dominant. At shorter heat treatment times the α s laths that form on cooling do so with a range of variant-related orientations to the β, but at longer annealing times this α s takes on the orientation of the surrounding α p . The implications for the mechanical performance of macrozone-containing bimodal Ti-6Al-4V material are discussed.

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Section: As-receivedsupporting

confidence: 77%

In situ observation of texture and microstructure evolution during rolling and globularization of Ti–6Al–4V

Warwick¹,

Jones²,

Bantounas

et al. 2013

Acta Materialia

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“…In contrast, 'soft'-oriented macrozones have their basal plane along the rolling direction. Bantounas et al [26] found that the c-axis of striated grains was tilted towards the loading direction in a range of 55 − 87 • .…”

Section: Spatial Orientationsmentioning

confidence: 99%

Influence of complex LCF and dwell load regimes on fatigue of Ti–6Al–4V

et al. 2016

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Real components are usually subjected to variable amplitude fatigue, and yet the deformation micromechanisms that occur due to such load changes have barely been the subject of study. Here, unidirectionally rolled equiaxed Ti6Al-4V plate was subjected to mixed dwell and variable amplitude low cycle fatigue (LCF), with the finding that overloads near the yield stress were found to retard subsequent fatigue crack growth, whilst elastic underloads were found to accelerate subsequent growth. Dwell intervals were found to be especially damaging, to a far greater extent than either dwell or LCF alone. Dwell facets were found to initiate subsurface and to be smoother than LCF facets, but were otherwise similar in orientation (∼ 30 • to the loading axis) and crystallographic plane, 2-13 • from (0002). However, no alteration of the slip bands underlying striations was observed at the point of load changes using TEM. In failure investigation, striation counting is an important tool; the loading changes used were not found to affect the number of striations formed. Dislocation networks were found between similarly oriented grains in the as-received material, which disintegrated under dwell loading and at high stresses.

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“…1,2) The subsurface fatigue crack initiation sites in near-α and α-β type titanium alloys commonly appear crystallographic transgranular facet or facets. [1][2][3][4][5][6][7][8] Mostly the facets formed on or near the {0001} basal plane regardless their inclination to the principal stress axis. Dislocation movement in α phase is restricted on the primary slip plane and fairly planar so that dislocation arrays on {01 1 0} < 11 2 0 > are piled-up in the vicinity of grain boundaries and a local stress concentration generates near α grain boundary.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Subsurface Fatigue Crack Generation in Ti–Fe–O Alloy at Low Temperature

Umezawa

Koga

2018

ISIJ Int.

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Subsurface microcracks developed in the Ti-Fe-O cross-rolled material were characterized in order to clarify the subsurface fatigue crack initiation. A considerable amount of microcracks in β platelets were detected. The {0001} transgraular microcracks in α grains predominantly generated at the β grain boundary between recovered α grain and recrystallized α grain, and grew into the recrystallized α grain along the basal plane, although the microcracks at the twist boundary of α grains and at the α-β interface were occasionally detected. Stress concentration around the microcrack in β platelets may assist the microcrack initiation on basal plane (transgranular facet) in neighboring α grain due to a combination of the shear stress and tensile stress normal to the basal plane at α-β boundary. The {0001} transgraular microcracks growth and/or coalescence occurred with the assistance of shear stress on prismatic plane such as {1010} steps.

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The effect of grain orientation on fracture morphology during high-cycle fatigue of Ti–6Al–4V

Cited by 181 publications

References 22 publications

In situ observation of texture and microstructure evolution during rolling and globularization of Ti–6Al–4V

In situ observation of texture and microstructure evolution during rolling and globularization of Ti–6Al–4V

Influence of complex LCF and dwell load regimes on fatigue of Ti–6Al–4V

Analysis of Subsurface Fatigue Crack Generation in Ti–Fe–O Alloy at Low Temperature

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