The effect of loading direction on strain localisation in wire arc additively manufactured Ti–6Al–4V

Lunt, David; Ho, Alistair; Davis, Alec; Harte, Allan; Martina, Filomeno; Fonseca, João Quinta da; Prangnell, P.B.

doi:10.1016/j.msea.2020.139608

Cited by 26 publications

(12 citation statements)

References 56 publications

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“…Although, after deposition, the lower Ti-64 section was dominated by the α phase, in Fig. 3a the α micro-texture variation, and the presence of single-variant grain boundary α colonies in the EBSD data, highlights the parent β-grain boundaries [36], [51] and confirms that the β-grain structure has been accurately reconstructed in the merged map shown in Fig. 3b.…”

Section: Alloy-alloy Transition Overviews and Bulk Texturesmentioning

confidence: 52%

Microstructure transition gradients in titanium dissimilar alloy (Ti-5Al-5V-5Mo-3Cr/Ti-6Al-4V) tailored wire-arc additively manufactured components

Kennedy

Davis

Caballero

et al. 2021

Materials Characterization

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Section: Alloy-alloy Transition Overviews and Bulk Texturesmentioning

confidence: 52%

Microstructure transition gradients in titanium dissimilar alloy (Ti-5Al-5V-5Mo-3Cr/Ti-6Al-4V) tailored wire-arc additively manufactured components

Kennedy

Davis

Caballero

et al. 2021

Materials Characterization

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“…For the chemically graded, diffusion bond region, the maximum effective shear strain is approximately three times lower than the bulk Ti-64 and approximately two times higher than that measured in the Ti-6242 bulk. Lunt et al [47,48] observed similar levels of maximum shear strain in the grain boundaries of a Ti-64 produced by plasma wire deposition.…”

Section: B Optical Strain Mapmentioning

confidence: 89%

“…With optical DIC it is possible to quantify the strain localization at a mesoscale level. For example, Littlewood et al [46] and Lunt et al [47,48] used optical DIC in a forged Ti-64 specimen and a Ti-64 plasma wire deposition specimen to observe the effective strain of the grains and strain partitioning between neighboring grains of different crystallographic orientations.…”

Section: Introductionmentioning

confidence: 99%

Deformation Behaviour of a FAST Diffusion Bond Processed from Dissimilar Titanium Alloy Powders

Blanch

Lunt

Baxter

et al. 2021

Metall Mater Trans A

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Titanium alloys have a high strength-to-weight ratio, fatigue performance and excellent corrosion resistance, and therefore are widely used in the aerospace sector due to their ability to withstand severe mechanical and thermal stresses in service. There are numerous cases where it would be desirable to use different titanium alloys in defined subcomponent regions to improve performance and efficiency. Conventional processing routes do not permit components to be produced with multiple titanium alloys and thus, design efficiency and optimization of component properties is compromised or over-engineered. In this study, a hybrid solid-state consolidation route is presented whereby field assisted sintering technology (FAST) is exploited to diffusion bond (DB) dissimilar titanium alloy powders in defined regions—a process termed FAST-DB. Titanium alloy powders Ti-6Al-4V (Ti-64) and Ti-6Al-2Sn-4Zr-2Mo (Ti-6242) were bonded using FAST in order to study the tensile deformation behavior and strain localization across a dissimilar alloy solid-state bond. FAST-DB was carried out at the sub- and super- beta transus temperatures of both alloys to generate dissimilar microstructure morphologies across the bond. In all cases, diffusion bonds showed excellent structural integrity with no defects and a smooth hardness profile across the bond. The deformation characteristics of the bonds was studied using two different tensile test approaches. The first approach used ASTM standard specimens to measure the mechanical properties of FAST-DB samples and study the location of the tensile failure. The second approach used a microtester and optical Digital Image Correlation to capture the grain interaction in the bond region under tensile loading. The work demonstrated that the diffusion bond remains intact and that tensile failure occurs in Ti-64 (i.e. the lower strength alloy) and is independent of the grain crystal orientation. The results from this study will provide materials engineers confidence in nesting FAST-DB technology in future near net shape manufacturing routes.

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“…The tensile properties were measured using different loading directions and considering the distance to the substrate and the free edges. In order to obtain a mechanistic understanding of the observed anisotropy, in-situ tensile testing combined with digital image correlation (DIC) was also performed as this technique provides unique information about deformation and strain localization in relation to the microstructure [38,[41][42][43][44][45]. The origin of tensile anisotropy in the investigated material is finally discussed in light of the obtained data.…”

Section: Introductionmentioning

confidence: 99%

Tensile properties of Ti-6Al-4V as-built by laser metal deposition: The relationship between heat affected zone bands, strain localization and anisotropy in ductility

Yvinec

Nait-Ali

Mellier

et al. 2022

Additive Manufacturing

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The effect of loading direction on strain localisation in wire arc additively manufactured Ti–6Al–4V

Cited by 26 publications

References 56 publications

Microstructure transition gradients in titanium dissimilar alloy (Ti-5Al-5V-5Mo-3Cr/Ti-6Al-4V) tailored wire-arc additively manufactured components

Microstructure transition gradients in titanium dissimilar alloy (Ti-5Al-5V-5Mo-3Cr/Ti-6Al-4V) tailored wire-arc additively manufactured components

Deformation Behaviour of a FAST Diffusion Bond Processed from Dissimilar Titanium Alloy Powders

Tensile properties of Ti-6Al-4V as-built by laser metal deposition: The relationship between heat affected zone bands, strain localization and anisotropy in ductility

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