Effect of heat treatment on the microstructure and mechanical properties of Inconel 718 processed by selective laser melting

Chlebus, Edward; Gruber, Konrad; Kuźnicka, Bogumiła; Kurzac, J.; Kurzynowski, Tomasz

doi:10.1016/j.msea.2015.05.035

Cited by 612 publications

(278 citation statements)

References 24 publications

Supporting

Mentioning

219

Contrasting

Order By: Relevance

“…These values are very close to nickel-based superalloys used for advanced turbine engines with YS often in the range of 900-1300 MPa and UTS of 1200-1600 MPa [18]. However, it should be noted that SLM-processed materials are characterized by a strong anisotropy and high residual stresses after fabrication which affect their mechanical behavior [9,19,20]. Consequently, further studies of high-temperature mechanical properties of Ti-Re alloys, taking into account the microstructure anisotropy and internal stresses, are needed for their comparison to Ni-based superalloys.…”

Section: Introductionsupporting

confidence: 64%

Hot Corrosion of Ti–Re Alloys Fabricated by Selective Laser Melting

et al. 2017

View full text Add to dashboard Cite

Selective laser melting (SLM) is an additive manufacturing process that enables novel alloy production by combining metals with significantly different physical properties. In this paper, the hot corrosion behavior of Ti-Re alloys fabricated by SLM was studied in a mixture of Na 2 SO 4 and NaCl salts at 600°C. The morphology and composition of the corrosion products were characterized by scanning electron microscopy with energy-dispersive X-ray spectroscopy and X-ray diffraction to understand the degradation mechanisms. It has been shown that the hot corrosion resistance of Ti-Re alloys was influenced by the chemical inhomogeneity of the oxide scale resulting from the presence of rhenium particles undissolved during the SLM process.

show abstract

Section: Introductionsupporting

confidence: 64%

Hot Corrosion of Ti–Re Alloys Fabricated by Selective Laser Melting

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Besides the microstructure characterizations, focus is also put on the building orientation dependency of mechanical properties. Though the mechanical properties largely depend on the specific process parameters, the general trends and observations are common to all SLM IN718 builds: the horizontally built samples have slightly higher tensile strength than the vertically built samples [160,164,166,194,195].…”

Section: Slm In718mentioning

confidence: 99%

“…As that for titanium alloys, employing SLM or EBM to manufacture Ni-base superalloys would depend on the specific case or application, since each process has its pros and cons. So far, the Ni-base superalloys applied to SLM are mainly the weldable ones, i.e., IN718 [113,[160][161][162][163][164][165][166][167], IN625 [79,80,168,169], Hastelloy X [170][171][172][173][174], Nimonic 263 [110], which have low additions of both Ti and Al and are less susceptible to strain age cracking. Expansion to the less-weldable Ni-base superalloys has also been attempted, such as IN939 [175], IN100 [176], IN738LC [177][178][179][180][181], CM247LC [114,[182][183][184] and Rene 142 [81].…”

Section: Materials Manufactured With Slmmentioning

confidence: 99%

“…The as-manufactured SLM IN718 is mostly associated with lower strengthen than after being heat-treated (solution+ageing or direct ageing) [160,161,163,166,[193][194][195], during which the strengthening phases γ ′ /γ ′′ precipitate and strengthen the matrix. Optimizing the heat treatments have been performed to dissolve the Laves phase and correctly precipitate the δ and strengthening phases γ ′ /γ ′′ .…”

Section: Slm In718mentioning

confidence: 99%

“…Optimizing the heat treatments have been performed to dissolve the Laves phase and correctly precipitate the δ and strengthening phases γ ′ /γ ′′ . Higher homogenization/solution temperature or longer homogenization/solution holding time is necessary for removing the Nb segregation and improving mechanical properties [163,166]. The texture in the as-manufactured SLM IN718 can vary with the specific process parameters.…”

Section: Slm In718mentioning

confidence: 99%

See 2 more Smart Citations

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

Characterization and Comparison of Inconel 625 Processed by Selective Laser Melting and Laser Metal Deposition

et al. 2016

View full text Add to dashboard Cite

Inconel 625 (IN625) is a Ni superalloy ideal for the aeronautic and aerospace industries because of its superior mechanical and corrosion resistance properties. However, the production of components with complex geometries by traditional processes is very expensive, so additive manufacturing (AM) technologies can be applied to reduce the costs. In this work, IN625 alloy is processed by two different AM processes: selective laser melting (SLM) and laser metal deposition (LMD). First, the different powders are characterized, and then a parameter optimization is performed to obtain the highest possible density (over 99.8%) and hardness, showing very fine microstructures. The LMD process allows the highest build-up rate, but results in less dimensional accuracy and a lower hardness than the SLM process.

show abstract

Effect of heat treatment on the microstructure and mechanical properties of Inconel 718 processed by selective laser melting

Cited by 612 publications

References 24 publications

Hot Corrosion of Ti–Re Alloys Fabricated by Selective Laser Melting

Hot Corrosion of Ti–Re Alloys Fabricated by Selective Laser Melting

Additively Manufactured Inconel 718 : Microstructures and Mechanical Properties

Characterization and Comparison of Inconel 625 Processed by Selective Laser Melting and Laser Metal Deposition

Contact Info

Product

Resources

About