Characterization of Ni-Based Superalloy Built by Selective Laser Melting and Electron Beam Melting

Kuo, Yen-Ling; Kamigaichi, Azusa; Kakehi, Koji

doi:10.1007/s11661-018-4769-y

Cited by 40 publications

(11 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This kind of approach allows the production of parts with free design constraint enabling the construction of integrated components, lightweight structures or topologically optimized geometries [14,15]. Metal AM techniques can be divided into powder bed fusion (PBF) techniques [16][17][18][19] and directed energy deposition (DED) techniques [20,21]. With respect to the PBF systems, DED process has been used not only to produce metallic components [22] but also has been employed to repair the high value parts [23].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Performance of Ti–6Al–4V Lattice Structures Manufactured via Electron Beam Melting (EBM): A Review

Del

Galati

Saboori

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

Electron beam melting (EBM) process is an additive manufacturing process largely used to produce complex metallic components made of high-performance materials for aerospace and medical applications. Especially, lattice structures made by Ti-6Al-4V have represented a hot topic for the industrial sectors because of having a great potential to combine lower weights and higher performances that can also be tailored by subsequent heat treatments. However, the little knowledge about the mechanical behaviour of the lattice structures is limiting their applications. The present work aims to provide a comprehensive review of the studies on the mechanical behaviour of the lattice structures made of Ti-6Al-4V. The main steps to produce an EBM part were considered as guidelines to review the literature on the lattice performance: (1) design, (2) process and (3) post-heat treatment. Thereafter, the correlation between the geometrical features of the lattice structure and their mechanical behaviour is discussed. In addition, the correlation among the mechanical performance of the lattice structures and the process precision, surface roughness and working temperature are also reviewed. An investigation on the studies about the properties of heat-treated lattice structure is also conducted.

show abstract

Section: Introductionmentioning

confidence: 99%

Microstructure and Mechanical Performance of Ti–6Al–4V Lattice Structures Manufactured via Electron Beam Melting (EBM): A Review

Del

Galati

Saboori

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

View full text Add to dashboard Cite

show abstract

“…This suggests one possible explanation: the SLM material is largely deformed and is not fully recovered after heat treatment. Such a possibility was not mentioned in Kuo et al [34,35] Here, we construct recrystallization fraction maps on a forged IN718 and SLM HA specimen, of which the forged IN718 is the same batch as in Gustafsson and Lundstro¨m [19] and is in as-received heat-treated condition, and the SLM HA is the one studied in the present study and is in as-heat-treated condition. As shown in Figure 10, the forged counterpart has a 69.79 pct recrystallization fraction, which is much higher than the 3.02 pct of the SLM HA condition.…”

Section: Creep At 823 K (550 C)? a General Discussion On Inferior Creep Resistance Of Slm In718mentioning

confidence: 89%

“…To the best of our knowledge, creep tests on SLM IN718 reported in the literature have been conducted at 903 K (630 C) [33] and 923 K (650 C). [34,35] Specifically, in Reference 35, under 923 K (650 C)/550 MPa, the creep properties of SLM IN718 are noticeably inferior to the cast&wrought (C&W) counterpart: the steady creep regime is almost absent, and the onset of tertiary creep occurs quite early for both the as-built and heat-treated conditions. The early onset of tertiary creep [35] is believed to be consistent with the relatively fast crack growth rate in the present SLM cases, which is associated with the high-stress intensity exponent m in Figure 8.…”

Section: A Damage Mechanism: Creep or Environmentally Assisted Grain Boundary Attack?mentioning

confidence: 99%

On the Dwell-Fatigue Crack Propagation Behavior of a High-Strength Ni-Base Superalloy Manufactured by Selective Laser Melting

Deng

Eriksson

Peng

et al. 2019

Metall Mater Trans A

View full text Add to dashboard Cite

This study focuses on the dwell-fatigue crack propagation behavior of IN718 manufactured via selective laser melting (SLM). The dwell-fatigue test condition is 823 K (550 $$^{\circ }$$∘C) with a long 2160-s dwell-holding period. Effects of heat treatment and loading direction on dwell-fatigue crack propagation rates are studied. A grain boundary $$\delta $$δ precipitate seems to be slightly beneficial to the dwell-fatigue cracking resistance of SLM IN718. A comparison has been made between SLM IN718 and forged counterparts at different temperatures, indicating that a creep damage mechanism is likely dominant for SLM IN718 under the present test condition. A general discussion of the inferior creep resistance of SLM IN718 is also included. The anisotropic dwell-fatigue cracking resistance has also been studied and rationalized with the effective stress intensity factor calculated from finite element modeling.

show abstract

“…But for the SLM counterpart, such an inferior creep resistance can not be simply attributed to the presence of internal defects if almost porosity-free is assumed after HIP. Such an inferiority of HIP-ed SLM creep resistance is not clearly addressed in these studies, even though Kuo et al [132,151] claimed that HIP can introduce serrated boundaries which should be beneficial to the creep performance. Similarly, Witkin et al [152] reported an anomalous and inferior notch rupture behaviour of HIP and heat treated SLM IN718 at 650 • C in combination stress rupture test, which shows zero elongation and is supposed to not be so if comparing to the wrought IN718.…”

Section: Ebm and Slm In718mentioning

confidence: 91%

“…Popovich et al [149] reported that the heat-treated SLM IN718 has shown inferior creep resistance to the wrought counterpart under 690 MPa at 650 • C, which might be attributed to the porosities even though the overall porosity fraction is acceptably low. Further, Kuo et al [132,150,151] systematically studied the effects of post treatment (HIP and heat treatment) on creep properties of SLM IN718 under 550 MPa at 650 • C, suggesting that HIP is more efficient than heat treatment to improve the creep resistance of SLM components. Interestingly, if to carefully compare the steady-state creep rate and creep strain between EBM, SLM and C&W (cast & wrought) IN718 listed in [132,151], one can find that even after HIP the SLM IN718 still shows relatively inferior creep resistance to the C&W counterpart, and the EBM IN718 is slightly better than the SLM IN718 but similarly inferior to the C&W counterpart.…”

Section: Ebm and Slm In718mentioning

confidence: 99%

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

Deng

2019

Linköping Studies in Science and Technology. Dissertations

View full text Add to dashboard Cite

Additive manufacturing (AM), also known as 3D printing, offers great design flexibility for manufacturing components with complex geometries, and has attracted significant interest in the aero and energy industries in the past decades. Among the commercial AM processes, selective laser melting (SLM) and electron beam melting (EBM) are the two most widely used ones for metallic materials. Inconel 718 (IN718) is a nickel-base superalloy and has impressive combination of good mechanical properties, weldability and low cost. Due to its excellent weldability, IN718 has been intensively applied in the AM filed, to gain more understanding of the AM processes and fully realize AM's potentials. The study objects in the present thesis include both EBM and SLM IN718. The solidification conditions in EBM and SLM are very different and are different to that of conventional cast, leading to unique microstructures mechanical properties. Therefore, this thesis aims to gain better understanding of the microstructures and anisotropic mechanical behaviours of both EBM and SLM IN718, by detailed characterizations and by comparisons with the forged counterpart. The as-built microstructure of EBM IN718 is spatially dependent: the periphery (contour) region has a mixture of equiaxed and columnar grains, while the bulk (hatch) region has columnar grains elongated along the building direction; the last solidified region close to the top sample surface shows segregation and Laves phases, otherwise the rest of the whole sample is well homogenized. Differently, the as-built microstructure of SLM IN718 is spatially homogeneous: the grains is rather equiaxed and with subgrain cell structures. These microstructures also respond differently to the standard heat treatment routines for the conventional counterparts. Anisotropic mechanical properties are evident in the room temperature tensile tests and high temperature dwell-fatigue tests. The anisotropic tensile properties of EBM IN718 at room temperature are more likely due to the directional alignment of porosities along the building direction rather than the strong crys-In these papers I have been the main contributor, performing all the experimental work, characterization, analysis and manuscript writing, under the supervision of Johan Moverare and Ru Lin Peng.

show abstract

Characterization of Ni-Based Superalloy Built by Selective Laser Melting and Electron Beam Melting

Cited by 40 publications

References 20 publications

Microstructure and Mechanical Performance of Ti–6Al–4V Lattice Structures Manufactured via Electron Beam Melting (EBM): A Review

Microstructure and Mechanical Performance of Ti–6Al–4V Lattice Structures Manufactured via Electron Beam Melting (EBM): A Review

On the Dwell-Fatigue Crack Propagation Behavior of a High-Strength Ni-Base Superalloy Manufactured by Selective Laser Melting

On the Microstructures and Anisotropic Mechanical Behaviours of Additively Manufactured IN718

Contact Info

Product

Resources

About