The effect of hot isostatic pressure on the corrosion performance of Ti-6Al-4 V produced by an electron-beam melting additive manufacturing process

Leon, Avi; Levy, Galit Katarivas; Ron, Tomer; Shirizly, Amnon; Aghion, Eli

doi:10.1016/j.addma.2020.101039

Cited by 35 publications

(29 citation statements)

References 50 publications

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“…Titanium and its alloys pose a unique combination of physical and mechanical properties such as high specific strength, high toughness, good corrosion resistance [1][2][3][4][5][6], etc. As such, Titanium alloys are often found in damage-critical load-bearing structures and weight critical products.…”

Section: Introductionmentioning

confidence: 99%

Ti-6Al-4V hybrid structure mechanical properties—Wrought and additive manufactured powder-bed material

Dolev

Osovski

Shirizly

2021

Additive Manufacturing

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The implementation of additive manufacturing techniques in the production of mission critical structural components is challenged by its low throughput and limited build envelope. In recent years, hybrid production methods are emerging to bridge between the build volume and high throughput of conventional production methods and the design freedom enabled by additive manufacturing. The repeatability of material properties and the quality of the interface between the additive manufactured and wrought material are crucial for the adoption of hybrid manufacturing techniques by the industry. Here, the tensile behavior and fracture toughness of a hybrid Ti-6Al-4V alloy are examined in detail. Ti-6Al-4V pre-forms were built onto a wrought Ti-6Al-4V start-plate and extracted via milling. Compact tension and uniaxial tension specimens extracted from the hybrid pre-forms demonstrated good fracture and properties with no preference for crack growth in neither the AM nor wrought materials. Microstructural characterization revealed a 40 mm transition layer into the wrought material which ends abruptly with no evidence of a gradually decaying heat-affected zone. The hybrid manufacturing approach studied here expands the current limitations of large-scale critical components with fine features and allow such structures to be produced with a higher throughput.

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Section: Introductionmentioning

confidence: 99%

Ti-6Al-4V hybrid structure mechanical properties—Wrought and additive manufactured powder-bed material

Dolev

Osovski

Shirizly

2021

Additive Manufacturing

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“…By adapting the HIP process, the fatigue strength of EBM Ti-6Al-4 V can be dramatically improved for the reason that the number of crack initiation sites within the material was significantly reduced. Further, the upgrading and optimization of the mechanical properties of as-built EBM products can also be realized due to the reduced amount of pores and un-melted substances [27].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Properties of Ti-6Al-4V Fabricated by Electron Beam Melting

et al. 2020

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Electron beam melting technique is a kind of near-net shaping, environmentally friendly metal additive manufacturing technique, which can form high-performance metal parts with complex shapes. It has been widely applied in the aerospace industry, biomedical application, automobile manufacturing, and other fields. Ti-6Al-4V is the most widely researched and applied alloy in the additive manufacturing field, but its microstructure is diverse, and its mechanical properties vary greatly. In this study, the effect of process parameters on the microstructure and the resulting mechanical properties of Ti-6Al-4V alloy was researched. The results show that the yield strength of Ti-6Al-4V alloy with a bimodal microstructure is higher than those with a basketweave microstructure. Energy dispersion spectrum (EDS) line scan and area scan results show that there is no element enrichment for the specimens with the highest yield strength. A speed factor of less than 40 is a must for obtaining relatively dense Ti-6Al-4V parts built with electron beam melting. We have done basic research for the subsequent manufacturing of complex shape parts, which is helpful to promote the application of electron beam melting technology in the aerospace field.

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“…However, the EBM-MP specimens show a more pronounced transition current zone, suggesting a higher instability of the oxide layer formed on this specimen. Some authors have observed a rapid increase in current density above 1.3 V vs. SCE, which can be interpreted as the transpassivity potential value [10]. By increasing the range of potential values, it is possible to see that the increase in current density is limited to a narrow range of potentials, as confirmed by Chiu et al (2018) [14].…”

Section: Electrochemical Testmentioning

confidence: 76%

“…Several scientific studies have described rapid prototyping techniques for fabricating titanium alloy objects for aerospace as well as biomedical applications [4][5][6][7][8]. However, most efforts have been focused on the study of the mechanical properties of the AM-produced parts; few papers have investigated both mechanical and corrosion properties [9,10], while the investigation of their electrochemical behaviour according to specimen topography has not been extensively considered in existing literature. De Damborenea et al (2017) [11] have characterised Ti-6Al-4V surgical pins using a DMLS technique and highlighted the formation of voluminous oxides that lead to serious drawbacks related to the corrosion resistance of the parts.…”

Section: Introductionmentioning

confidence: 99%

As-Built EBM and DMLS Ti-6Al-4V Parts: Topography–Corrosion Resistance Relationship in a Simulated Body Fluid

Acquesta

Monetta

2020

Metals

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Machined devices made of titanium or titanium alloys are widely used in biomedical applications. Recently, additive manufacturing technologies (AM) were proposed to reduce the cost of parts and customise their shape. While several researchers have studied the characterisation of the machined surfaces of AM products, less attention has been focused on the study of the surfaces of as-produced parts. The aim of this study was to compare the surface and bulk properties of Ti-6Al-4V alloy products obtained using two types of AM—i.e., electron beam melting and direct metal laser sintering—in comparison to the wrought material and analyse their metallographic, crystallographic, topographic, and electrochemical properties. The metallographic and crystallographic, as well as topographic, analysis showed different microstructures and surface area extensions between the tested specimens. Potentiodynamic polarisation tests highlighted the complex electrochemical behaviour of additively manufactured parts if compared to that of the traditionally fabricated ones. The tests performed on mechanically polished parts underlined similar electrochemical performance between them, even if the additive manufactured ones exhibited a certain instability. Although the as-produced additive manufactured parts present exciting surface shapes, useful in the biomedical field, significant drawbacks remain. A more in-depth study of the device surface modifications, to improve their electrochemical behaviour, is needed.

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The effect of hot isostatic pressure on the corrosion performance of Ti-6Al-4 V produced by an electron-beam melting additive manufacturing process

Cited by 35 publications

References 50 publications

Ti-6Al-4V hybrid structure mechanical properties—Wrought and additive manufactured powder-bed material

Ti-6Al-4V hybrid structure mechanical properties—Wrought and additive manufactured powder-bed material

Microstructure and Mechanical Properties of Ti-6Al-4V Fabricated by Electron Beam Melting

As-Built EBM and DMLS Ti-6Al-4V Parts: Topography–Corrosion Resistance Relationship in a Simulated Body Fluid

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The effect of hot isostatic pressure on the corrosion performance of Ti-6Al-4 V produced by an electron-beam melting additive manufacturing process

Cited by 35 publications

References 50 publications

Ti-6Al-4V hybrid structure mechanical properties—Wrought and additive manufactured powder-bed material

Ti-6Al-4V hybrid structure mechanical properties—Wrought and additive manufactured powder-bed material

Microstructure and Mechanical Properties of Ti-6Al-4V Fabricated by Electron Beam Melting

As-Built EBM and DMLS Ti-6Al-4V Parts: Topography–Corrosion Resistance Relationship in a Simulated Body Fluid

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Product

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The effect of hot isostatic pressure on the corrosion performance of Ti-6Al-4 V produced by an electron-beam melting additive manufacturing process