Microstructure and mechanical properties of nickel based superalloy IN718 produced by rapid prototyping with electron beam melting (EBM)

Strondl, Annika; Palm, Martin; Gnauk, J.; Frommeyer, G.

doi:10.1179/026708309x12468927349451

Cited by 135 publications

(64 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…They also showed that it is possible to have equiaxed grain structure even in the plane parallel to the build direction. Moreover, Strondl et al [32] showed that the IN 718 alloy made by EBM process is a textured material oriented following the {200} γ plane. This was further confirmed by Idell et al [33] in a 718Plus alloy made by LBM.…”

Section: High Temperature Oxidation Of the In 718 Alloymentioning

confidence: 99%

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

2018

View full text Add to dashboard Cite

A B S T R A C TThe oxidation behaviour of IN 718 alloys produced by laser beam melting and electron beam melting was compared to that of the wrought alloy at 850°C in laboratory air. Oxide scales of all alloys were similar in nature and morphology with small differences due to powder particles sintered on the surface of additive manufacturing parts. Nevertheless, major differences in surface topography were noticed, these could affect surface area estimations and consequentlymass gain estimations. A quantitative correlation was determined between apparent parabolic rate constant and surface area.

show abstract

Section: High Temperature Oxidation Of the In 718 Alloymentioning

confidence: 99%

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

2018

View full text Add to dashboard Cite

show abstract

“…Strondl et al performed pioneering research on EBM processing of Inconel 718. [26][27][28] This work characterized fully dense EBM Inconel 718 using x-ray diffraction (XRD), transmission electron microscopy (TEM), and EBSD. XRD showed "very sharp" (100) texture in the build direction, and this texture remained pronounced after postprocess heat treatment.…”

Section: B Application Of Am To Inconel 718mentioning

confidence: 99%

Thermal effects on microstructural heterogeneity of Inconel 718 materials fabricated by electron beam melting

et al. 2014

View full text Add to dashboard Cite

Additive manufacturing technologies, also known as 3D printing, have demonstrated the potential to fabricate complex geometrical components, but the resulting microstructures and mechanical properties of these materials are not well understood due to unique and complex thermal cycles observed during processing. The electron beam melting (EBM) process is unique because the powder bed temperature can be elevated and maintained at temperatures over 1000°C for the duration of the process. This results in three specific stages of microstructural phase evolution: (a) rapid cool down from the melting temperature to the process temperature, (b) extended hold at the process temperature, and (c) slow cool down to the room temperature. In this work, the mechanisms for reported microstructural differences in EBM are rationalized for Inconel 718 based on measured thermal cycles, preliminary thermal modeling, and computational thermodynamics models. The relationship between processing parameters, solidification microstructure, interdendritic segregation, and phase precipitation (d, c9, and c0) are discussed.

show abstract

“…The strengthening precipitate γ ′′ has precipitated in the γ matrix, and small (Ti,Nb)(C,N,B) precipitates can be found to string and align parallel to the building direction. In their subsequent paper [75], anisotropic tensile properties were reported as due to the local agglomerate of porosities rather than the intrinsic properties. The anisotropic tensile properties were further confirmed by Kirka et al [77,186]: both the tensile strength and elongation are higher tested along the building direction that tested perpendicular to the building direction in the as-manufactured sample, and these anisotropic properties almost disappear after post heat-treatment.…”

Section: Ebm In718mentioning

confidence: 99%

“…Currently, the major EBM Ni-base superalloy research is focus on IN718 [53,[74][75][76][77][78] and IN625 [79,80] because of their weldabilities. However, the relatively high chamber temperature during process enables the possibility of manufacturing those γ ′ strengthened Ni-based superalloy.…”

Section: Materials Manufactured With Ebmmentioning

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

Microstructure and mechanical properties of nickel based superalloy IN718 produced by rapid prototyping with electron beam melting (EBM)

Cited by 135 publications

References 17 publications

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

High temperature oxidation of IN 718 manufactured by laser beam melting and electron beam melting: Effect of surface topography

Thermal effects on microstructural heterogeneity of Inconel 718 materials fabricated by electron beam melting

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Contact Info

Product

Resources

About