Microstructure and mechanical behaviour of Ti―6Al―7Nb alloy produced by selective laser melting

Chlebus, Edward; Kuźnicka, Bogumiła; Kurzynowski, Tomasz; Dybała, Bogdan

doi:10.1016/j.matchar.2011.03.006

Cited by 360 publications

(202 citation statements)

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“…The microstructure evolution of SLM Ti-6Al-4V processed in various conditions such as asbuilt, stress relieved, and solution treated has been previously reported in the literature [14,15,19,[21][22][23]. 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].…”

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

confidence: 79%

“…Microscopy studies have demonstrated that due to the high cooling rates intrinsic to the SLM process, the microstructure of the as-built components consists entirely of αʹ martensitic phase. The αʹ grains are contained within elongated prior-β grains that grow epitaxially through successive layer depositions [21][22][23]. It was observed that this microstructure might not be suitable for most of the current applications of α/β Ti alloys as it is typically associated with high strength but poor ductility and possess a certain degree of anisotropy [21,22,24].…”

Section: Introductionmentioning

confidence: 99%

“…The αʹ grains are contained within elongated prior-β grains that grow epitaxially through successive layer depositions [21][22][23]. It was observed that this microstructure might not be suitable for most of the current applications of α/β Ti alloys as it is typically associated with high strength but poor ductility and possess a certain degree of anisotropy [21,22,24]. In order to achieve a better balance between strength and ductility, several SLM post-processing treatments have been introduced, leading to mechanical properties that are much closer to those of conventionally manufactured titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, limited work has been done to show the correlation between the microstructure and the crystallographic texture with the mechanical properties of SLM Ti-6Al-4V. It has been postulated that the residual stresses and the martensitic microstructure of the as-built parts cause low ductility in the SLM Ti-6Al-4V parts [15], whereas the defects are generally considered to be the main contributor to the anisotropic behaviour of the components [17,21]. Unfortunately, the contribution of the elongated prior-β grains and the αʹ crystallographic texture to the fracture mechanisms in SLM Ti-6Al- 4V has not yet been illustrated systematically.…”

Section: Introductionmentioning

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

772

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: 79%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

772

288

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show abstract

“…With post heat treatments, the SLM Ti-6Al-4V might be modified to lamellar α+β or lamellar α+β + globular α, while EBM Ti6Al-4V still retains the same acicular α+β phases [144], giving comparable mechanical properties. Commercially pure titanium (CP-Ti) [145][146][147][148] and Ti-6Al-7Nb [149,150] which have better mechanical properties and biocompatibility than Ti-6Al-4V have also been manufactured via SLM for medical implants applications.…”

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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Microstructure and Mechanical Properties of Ti‐6A1‐4V Fabricated by Selective Laser Melting

Simonelli¹,

Tse²,

Tuck

2012

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Microstructure and mechanical behaviour of Ti―6Al―7Nb alloy produced by selective laser melting

Cited by 360 publications

References 17 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

Microstructure and Mechanical Properties of Ti‐6A1‐4V Fabricated by Selective Laser Melting

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