On the Texture Formation of Selective Laser Melted Ti-6Al-4V

Simonelli, Marco; Tse, Yau Yau; Tuck, Christopher

doi:10.1007/s11661-014-2218-0

Cited by 284 publications

(133 citation statements)

References 35 publications

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“…The laser scan strategy that was used to melt each layer of powder is reported in a related study [27]. Each layer was scanned once.…”

Section: Methodsmentioning

confidence: 99%

“…EBSD analysis was carried out with a step size of 1 μm. The prior-β phase was reconstructed following the Burgers orientation relationship according to the method detailed elsewhere [27]. Fracture surfaces were investigated mainly using secondary electron imaging on a Carl Zeiss (Leo) FEG-SEM.…”

Section: Methodsmentioning

confidence: 99%

“…2a-c). Due to the layer-wise nature of the process, the prior-β grains grow in a columnar way almost vertically through several layers in the range of 1 -3 mm, while the mid-length average width of the prior β grains is 103 ± 32 μm [27]. Therefore, the microstructure on the frontal and lateral planes (xz-and yz-planes) differs significantly from the microstructure on the horizontal planes parallel to the build platform (xy-plane).…”

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

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

776

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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“…The laser scan strategy that was used to melt each layer of powder is reported in a related study [27]. Each layer was scanned once.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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

confidence: 99%

See 1 more Smart Citation

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

776

288

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show abstract

“…• Titanium alloys: Titanium alloy, specifically Ti-6Al-4V [72,[137][138][139][140][141][142][143], is the most investigated material for SLM process. Manufacturing titanium alloys via conventional methods is relatively difficult, since Ti is highly reactive and sensitive to chemical impurities, such as O, N and H. With this regard, SLM is superior to conventional manufacturing methods since the inert gas in the SLM chamber can provide a protective atmosphere.…”

Section: Materials Manufactured With Slmmentioning

confidence: 99%

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

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Linköping 2018Cover image: A fracture surface of EBM IN718 after tensile test at room temperature.During the course of research underlying this thesis, Dunyong Deng was enrolled in Agora Materiae, a multidiciplinary doctoral program at Linköping University, Sweden. Printed by LiU-Tryck 2018 © Dunyong Deng AbstractAdditive manufacturing (AM), also known as 3D printing, has gained significant interest in aerospace, energy, automotive and medical industries due to its capabilities of manufacturing components that are either prohibitively costly or impossible to manufacture by conventional processes. Among the various additive manufacturing processes for metallic components, electron beam melting (EBM) and selective laser melting (SLM) are two of the most widely used powder bed based processes, and have shown great potential for manufacturing high-end critical components, such as turbine blades and customized medical implants. The futures of the EBM and SLM are doubtlessly promising, but to fully realize their potentials there are still many challenges to overcome.Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties and low cost. Though IN718 is being mostly used as a turbine disk material now, the initial introduction of IN718 was to overcome the poor weldability of superalloys in 1960s, since sluggish precipitation of strengthening phases γ ′ /γ ′′ enables good resistance to strain-age cracking during welding or post weld heat treatment. Given the similarity between AM and welding processes, IN718 has been widely applied to the metallic AM field to facilitate the understandings of process-microstructure-property relationships.The work presented in this licentiate thesis aims to better understand microstructures and mechanical properties EBM and SLM IN718, which have not been systematically investigated. Microstructures of EBM and SLM IN718 have been characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM) and correlated with the process conditions. Monotonic mechanical properties (e.g., Vickers microhardness and tensile properties) have also been measured and rationalized with regards to the microstructure evolutions before and after heat treatments.For EBM IN718, the results show the microstructure is not homogeneous but dependant on the location in the components, and the anisotropic mechanical properties are probably attributed to alignment of porosities rather than texture.iii Post heat treatment can slightly increase the mechanical strength compared to the as-manufactured condition but does not alter the anisotropy. SLM IN718 shows significantly different microstructure and mechanical properties to EBM IN718. The as-manufactured SLM IN718 has very fine dendritic microstructure and Laves phases in the interdendrites, and is "work-hardened" by the residual strains and dislocations present in the material. Mechanical properties are different between horizontally and vertically built samples, and heat treatment can m...

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“…Optical micrographs illustrating the wide columnar grains of the (a) as-fabricated specimen and (b) heat-treated specimen individual plates. According to Simonelli et al [8], SLMed Ti64 alloy has approximately five or six types of α' phases, and most of them have a 60° misorientation. A LABs dispersion ratio of heat-treated specimen (d) is lower than that of as-fabricated specimen (c).…”

Section: Resultsmentioning

confidence: 99%

Effect of Heat Treatment on Microstructure and Impact Toughness of Ti-6Al-4V Manufactured by Selective Laser Melting Process

Lee¹,

Kim²,

Yu³

et al. 2017

Archives of Metallurgy and Materials

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This study manufactured Ti-6Al-4V alloy using one of the powder bed fusion 3D-printing processes, selective laser melting, and investigated the effect of heat treatment (650°C/3hrs) on microstructure and impact toughness of the material. Initial microstructural observation identified prior-β grain along the building direction before and after heat treatment. In addition, the material formed a fully martensite structure before heat treatment, and after heat treatment, α and β phase were formed simultaneously. Charpy impact tests were conducted. The average impact energy measured as 6.0 J before heat treatment, and after heat treatment, the average impact energy increased by approximately 20% to 7.3 J. Fracture surface observation after the impact test showed that both alloys had brittle characteristics on macro levels, but showed ductile fracture characteristics and dimples at micro levels.

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On the Texture Formation of Selective Laser Melted Ti-6Al-4V

Cited by 284 publications

References 35 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

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Effect of Heat Treatment on Microstructure and Impact Toughness of Ti-6Al-4V Manufactured by Selective Laser Melting Process

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