Densification behavior, microstructure evolution, and wear performance of selective laser melting processed commercially pure titanium

Gu, Dongdong; Hagedorn, Yves‐Christian; Meiners, Wilhelm; Meng, Guangbin; Batista, Rui João Santos; Wissenbach, Konrad; Poprawe, Reinhart

doi:10.1016/j.actamat.2012.04.006

Cited by 890 publications

(303 citation statements)

References 41 publications

Supporting

Mentioning

251

Contrasting

Unclassified

Order By: Relevance

“…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

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

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

View full text Add to dashboard Cite

show abstract

“…Parts with mechanical properties comparable to those of the conventionally manufactured titanium alloys have also been reported [15,16]. As the process stability has shown to be crucial for the production of near fully dense products, most of the studies of CP-Ti and α/β Ti alloys manufactured by SLM have focussed primarily on the densification mechanisms during the fabrication process [17][18][19][20]. Indeed, it has been reported that by combining suitable scan strategy and high laser energy density, it is possible to reduce significantly the volume fraction of defects (i.e.…”

Section: Introductionmentioning

confidence: 99%

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

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

“…That type of complete melting is highly useful for producing well-bonded, highdensity structures from engineering metals [6,7]. In selective laser melting, a singular component powder is melted and crystallized by scanning of a CO 2 or an Nd-YAG laser onto powder bed, which is different from selective laser sintering (SLS) that uses metal particles encapsulated with a polymer or a combination of various metal powders of low and high melting points [8,9]. SLM is a layer-wise material addition method that enables complex 3D solid model production by selectively consolidating successive layers of pre-deposited powder, each corresponding to particular slice from the CAD design.…”

Section: Introductionmentioning

confidence: 99%

Surface Quality Research for Selective Laser Melting of Ti-6Al-4V Alloy

Król¹,

Tański²

2016

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

One of the innovative technology of producing the components is Selective Laser Melting (SLM) belongs to additive manufacturing techniques. SLM technology has already been successfully applied in the automotive, aerospace and medical industries. Despite progress in material flexibility and mechanical performances, relatively poor surface finish still presents a significant weakness in the SLM process. The scope of the present article is the study the influence of selective laser melting parameters such as laser power, scanning speed, exposure time and hatch spacing through additive manufacturing as well as the orientation of the model corresponding to the laser beam on the surface characteristic of the components made from Ti-6Al-4V alloy. By using optimized process parameters, a low surface roughness can be obtained. In research, the machine for the selective laser melting of metal powders Renishaw AM 125 device was used. Based on experiment plan, 32 models were produced, which were examined to define the surface roughness and thus represent an influence of process parameters and the orientation on the model surface quality. The article discusses the fundamental factors determining the roughness that gives invaluable knowledge to improve the surface quality of SLM parts.

show abstract

Densification behavior, microstructure evolution, and wear performance of selective laser melting processed commercially pure titanium

Cited by 890 publications

References 41 publications

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

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

Surface Quality Research for Selective Laser Melting of Ti-6Al-4V Alloy

Contact Info

Product

Resources

About