Influence of processing on microstructure and mechanical properties of (α+β) titanium alloys

Lütjering, G.

doi:10.1016/s0921-5093(97)00778-8

Cited by 1,277 publications

(620 citation statements)

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“…The main microstructural features, in particular, porosity, prior-β grain boundaries, existing phases, and crystallographic texture will be described as they have a great influence on the mechanical behaviour and crack propagation in Ti alloys [30,31]. As the samples showed the same microstructure (i.e.…”

Section: Microstructure and Texture Of As-built Parts And Stress Relimentioning

confidence: 97%

“…It has been shown that in fine microstructures the crack tip deflects at the grain boundaries generating predominantly inter granular fracture as the neighbouring α grains (or colonies) have multiple distinct crystallographic orientations (i.e. weak texture) [31,46,49]. Ti-6Al-4V with microstructure consisting of α colonies will, on the other hand, give intragranular fatigue fracture [31,40].…”

Section: Anisotropy Of Slm Ti-6al-4v: Tensile Properties Of Samples Wmentioning

confidence: 99%

“…weak texture) [31,46,49]. Ti-6Al-4V with microstructure consisting of α colonies will, on the other hand, give intragranular fatigue fracture [31,40].…”

Section: Anisotropy Of Slm Ti-6al-4v: Tensile Properties Of Samples Wmentioning

confidence: 99%

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Effect of the build orientation on the mechanical properties and fracture modes of SLM Ti–6Al–4V

Simonelli

Tse

Tuck

2014

Materials Science and Engineering: A

806

288

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originates from the AM process. To understand the effect of the microstructure on the tensile properties, selective laser melted (SLM) Ti-6Al-4V samples built in three different orientations were tensile tested. The investigated samples were near fully dense, in two distinct conditions, as-built and stress relieved respectively. It was found that the build orientation affects the tensile properties, and in particular the ductility of the samples. The mechanical anisotropy of the parts was discussed in relation to the crystallographic texture, phase composition and the predominant fracture mechanisms. Fractography and electron backscatter diffraction (EBSD) results indicate that the predominant fracture mechanism is 2 intergranular fracture along the grain boundaries present and thus provide and explanation for the typical fracture surface features observed in fracture AM Ti-6Al-4V.

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Section: Microstructure and Texture Of As-built Parts And Stress Relimentioning

confidence: 97%

Section: Anisotropy Of Slm Ti-6al-4v: Tensile Properties Of Samples Wmentioning

confidence: 99%

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Effect of the build orientation on the mechanical properties and fracture modes of SLM Ti–6Al–4V

Simonelli

Tse

Tuck

2014

Materials Science and Engineering: A

806

288

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“…Also the alpha colony size, which is represented by the different colors in the IPF maps, is different for the two crack profiles; specimen 2 exhibits a finer alpha colony size than specimen 1. It is well known that the alpha colony size is one of the most important microstructural features having impact on the mechanical properties, since its size corresponds to the effective slip length [20], which in this case could explain the more serrated appearance of specimen 1. In Figure 9 the Schmid factors for the primary slip systems are mapped for the two crack profiles, with the loading direction in the vertical direction.…”

Section: Figure 8 Inverse Pole Figure Maps Of the Crack Profiles Cp1mentioning

confidence: 98%

Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V

Åkerfeldt

Colliander

Pederson

et al. 2018

Materials Characterization

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By additive manufacturing (AM) there is a feasibility of producing near net shape components in basically one step from 3D CAD model to final product. The interest for AM is high and during the past decade a lot of research has been carried out in order to understand the influence from process parameters on the microstructure and furthermore on the mechanical properties. In the present study laser metal wire deposition of Ti-6Al-4V has been studied in detail with regard to its fatigue crack propagation characteristics. Two specimen orientations, parallel and perpendicular to the deposition direction, have been evaluated at room temperature and at 250°C. No difference in the fatigue crack growth rate could be confirmed for the two specimen orientations. However, in the fractographic study it was observed that the tortuosity varied between certain regions on the fracture surface. The local crack path characteristic could be related to the alpha colony size and/or the crystallographic orientation. Moreover, large areas exhibiting similar crystallographic orientation were observed along the prior beta grain boundaries, which were attributed to the wide alpha colonies frequently observed along the prior beta grain boundaries.

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“…Na liga de titânio, esse elemento atua como um estabilizador da fase-β, melhorando suas propriedades mecânicas e sua resistência à corrosão. Este alto conteúdo de ferro na liga, possivelmente seja devido aos processos mecânicos que a haste metálica possa ter sido submetida [23].…”

Section: Elementosunclassified

Avaliação de não conformidades de próteses de quadril fabricadas com ligas de titânio e aço inox

Bezerra¹,

Nascimento²,

Luna³

et al. 2017

Matéria (Rio J.)

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RESUMO Um grande número de ligas metálicas apresenta comportamento satisfatório quando usadas na fabricação de implantes para próteses de quadril. Porém, as mesmas devem estar em conformidades com as normatizações, para assegurar sua qualidade por longos períodos e sem perder sua funcionalidade. Portanto, o presente trabalho tem como objetivo estudar as não conformidades de duas próteses de quadril, sendo uma de titânio e outra de aço inoxidável frente às normatizações. As próteses estudadas passaram por análise de difração de raios-x (DRX), fluorescência de raios-x, ensaio de tração e microscopia óptica (MO). As amostras para o ensaio de tração foram confeccionadas conforme a norma ASTM E 8M, bem como, as amostras do MO passou pelo procedimento metalográfico. Os resultados evidenciaram que algumas composições químicas apresentaram discordância em relação às normas. As análises de DRX mostraram picos de austenita e ausência de ferrita para o aço inoxidável, enquanto a liga de titânio apresenta uma fase alfa (HC) mais significativa que a fase beta (CCC). As ligas de aço inox e titânio apresentam limite de escoamento e resistência à tração que atendem as normas. Por outro lado, o módulo de elasticidade das ligas de titânio e aço inox, chega a ser dez vezes maior do que o módulo do osso humano. Portanto, o alto módulo de elasticidade das ligas, favorece problemas de reabsorção óssea. A microestrutura do aço inox é típica de uma matriz austenítica, enquanto a da liga de titânio apresenta microestruturas α+ β.

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Influence of processing on microstructure and mechanical properties of (α+β) titanium alloys

Cited by 1,277 publications

References 0 publications

Effect of the build orientation on the mechanical properties and fracture modes of SLM Ti–6Al–4V

Effect of the build orientation on the mechanical properties and fracture modes of SLM Ti–6Al–4V

Electron backscatter diffraction characterization of fatigue crack growth in laser metal wire deposited Ti-6Al-4V

Avaliação de não conformidades de próteses de quadril fabricadas com ligas de titânio e aço inox

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