On the mechanical behaviour of titanium alloy TiAl6V4 manufactured by selective laser melting: Fatigue resistance and crack growth performance

Leuders, Stefan; Thöne, M.; Riemer, Andre; Niendorf, Т.; Richard, Hans Albert; Maier, Hans Jürgen

doi:10.1016/j.ijfatigue.2012.11.011

Cited by 1,230 publications

(715 citation statements)

References 30 publications

Supporting

Mentioning

657

Contrasting

Unclassified

Order By: Relevance

“…The normal residual stress components acting on the x-and z-axis are 96 and 239 MPa respectively. These values correspond well to those reported in the literature for SLM titanium parts built with an optimised scan strategy [25,[41][42][43]. Although in this research the distribution of the residual stresses with the height of the sample is not taken into account, x-ray diffraction gives an accurate indication of the high thermal stresses that can be developed during SLM [44].…”

Section: Comparison Of the Tensile Properties Of Stress Relieved And supporting

confidence: 87%

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

805

288

View full text Add to dashboard Cite

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.

show abstract

Section: Comparison Of the Tensile Properties Of Stress Relieved And supporting

confidence: 87%

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

805

288

View full text Add to dashboard Cite

show abstract

“…HIP can significantly reduce the porosities, but still cannot result in 100% dense microstructure [70]. HIP reduces/eliminates the process-induced porosities [71], but might not close those gas-trapped pores since the trapped gas can still "prop up" the pores [72].…”

Section: Electron Beam Meltingmentioning

confidence: 99%

“…The spherical pores are attributed to: (a) the inert gas is involved into the melt pool and (b) the gas trapped inside the powder can not escape from the melt pool [72,115]. These spherical pores are less deleterious to the components' mechanical properties, while the irregular pores, which can raise the concentration of stress under service and lead to failure, are the major concern for controlling the porosities.…”

Section: Porositymentioning

confidence: 99%

“…• 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%

See 1 more Smart Citation

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Deng

2018

Linköping Studies in Science and Technology. Licentiate Thesis

View full text Add to dashboard Cite

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...

show abstract

“…To date, no study on the fatigue crack growth on LMwD:ed Ti-6Al-4V is available in the literature to the authors knowledge. So far, only AM processes with powder used as feedstock material have been evaluated [12][13][14][15][16][17]. The main objective of the current work has been to characterize the crack profiles of fatigue crack growth fractured specimens, thereby increasing the understanding of the crack propagation behavior and the impact of microstructural features and crystallographic orientation on the crack path characteristics.…”

Section: Introductionmentioning

confidence: 99%

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

Åkerfeldt

Colliander

Pederson

et al. 2018

Materials Characterization

View full text Add to dashboard Cite

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.

show abstract

On the mechanical behaviour of titanium alloy TiAl6V4 manufactured by selective laser melting: Fatigue resistance and crack growth performance

Cited by 1,230 publications

References 30 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

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

Contact Info

Product

Resources

About