Evolution of dislocation cellular pattern in Inconel 718 alloy fabricated by laser powder-bed fusion

He, Mengjie; Cao, Hailin; Liu, Qian; Jiang, Yi; Ni, Yong; Wang, Shuai

doi:10.1016/j.addma.2022.102839

Cited by 10 publications

(7 citation statements)

References 36 publications

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“…The characteristic microstructure of IN718 fabricated without the addition of Y 2 O 3 using the LPBF process has been previously reported. [ 39–41 ] In our examination of the as‐built IN718‐0.5Y 2 O 3 , we observed a similar microstructure, as shown in Figure a, which displays the significant presence of Laves phase in the inter‐dendritic regions. In this situation, the majority of the Y 2 O 3 particles are obscured by Laves phase, making the analysis of Y 2 O 3 challenging.…”

Section: Resultssupporting

confidence: 64%

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Unique Yttria Nanoparticle Strengthening in an Inconel 718 Superalloy Fabricated by Additive Manufacturing

Dai,

Zhu,

Yan

et al. 2023

Adv Materials Technologies

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Oxide dispersion strengthened (ODS) nickel (Ni)‐based superalloys are advanced materials known for their outstanding tensile and creep performance at temperatures exceeding 1000 °C. Nevertheless, their conventional synthesis presents a longstanding challenge in cost‐effectively producing intricate components for critical applications. In this work, electrostatic self‐assembly (ESA) of powders with the laser powder bed fusion (LPBF) process have been successfully combined to produce yttria ODS Inconel 718 (IN718) alloy for the first time. The approach has demonstrated a significant contribution of yttria to the strength of IN718 after the solid solution heat treatment, as evidenced by ≈50% improvement in room temperature yield strength with a 0.5 wt.% yttria addition. The addition of yttria by this process leads to a heterogeneous microstructure. This heterogeneous microstructure comprises two distinct grain areas with varying amounts of yttria nanoparticles and dislocation storage. It has been shown that the yield strength increase can be predicted by the combination of both Y2O3 dispersion strengthening and dislocation strengthening mechanisms. These findings offer an effective approach to tailor heterogeneous microstructures, unlocking new opportunities for cost‐effectively producing high‐performance ODS Ni‐based superalloy products with excellent mechanical properties.

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Section: Resultssupporting

confidence: 64%

“…The characteristic microstructure of IN718 fabricated without the addition of Y 2 O 3 using the LPBF process has been previously reported. [39][40][41] In our examination of the as-built IN718-0. [42] Conversely, the IPF and GND mapping images of the IN718-0.5Y 2 O 3 counterparts (Figure 4c,d) display notable differences.…”

Section: Resultsmentioning

confidence: 99%

Unique Yttria Nanoparticle Strengthening in an Inconel 718 Superalloy Fabricated by Additive Manufacturing

Dai,

Zhu,

Yan

et al. 2023

Adv Materials Technologies

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“…This thermal history during the LPBF process is of vital importance in driving the formation of pre-existing dislocations (figure 7). According to classic solidification theory, these pre-existing dislocations can be formed because of highly periodic thermal stresses triggered by fast heating and cooling processes [46,47]. The resulting thermal contraction stress generates strains, promoting sub-grain formation.…”

Section: Formation Mechanism Of Heterogeneous Microstructure Via Lpbfmentioning

confidence: 99%

Role of heterogenous microstructure and deformation behavior in achieving superior strength-ductility synergy in zinc fabricated via laser powder bed fusion

Dong,

Han,

Zhao

et al. 2024

Int. J. Extrem. Manuf.

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Zinc (Zn) is considered a promising biodegradable metal for implant applications due to its appropriate degradability and favorable osteogenesis properties. In this work, laser powder bed fusion (LPBF) additive manufacturing was employed to fabricate pure Zn with a heterogenous microstructure and exceptional strength-ductility synergy. An optimized processing window of LPBF was established for printing Zn samples with relative densities greater than 99% using a laser power range of 80–90 W and a scanning speed of 900 mm/s. The Zn sample printed with a power of 80 W at a speed of 900 mm/s exhibited a hierarchical heterogenous microstructure consisting of millimeter-scale molten pool boundaries, micrometer-scale bimodal grains, and nanometer-scale pre-existing dislocations, due to rapid cooling rates and significant thermal gradients formed in the molten pools. The printed sample exhibited the highest ductility of ~12.1% among all reported LPBF-printed pure Zn to date with appreciable ultimate tensile strength (~128.7 MPa). Such superior strength-ductility synergy can be attributed to the presence of multiple deformation mechanisms that are primarily governed by heterogeneous deformation-induced hardening resulting from the alternatively arrangement of bimodal Zn grains with pre-existing dislocations. Additionally, continuous strain hardening was facilitated through the interactions between deformation twins, grains and dislocations as strain accumulated, further contributing to the superior strength-ductility synergy. These findings provide valuable insights into the deformation behavior and mechanisms underlying exceptional mechanical properties of LPBF-printed Zn and its alloys for implant applications.

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“…The Inconel 718 (IN718) superalloys, consisting of more than 8 different components and characterized by a precipitation-strengthened structure predominantly composed of γ and γ' phases, demonstrate significant potential due to their exceptional tensile strength, high yield strength, and excellent resistance to corrosion at elevated temperatures [1][2][3]. The IN718 superalloys have been extensively utilized in the aerospace sector, particularly in aero engines [4,5].…”

Section: Introductionmentioning

confidence: 99%

A novel IN718 superalloy of superior mechanical properties designed by the first principle and D-electron theory

Li,

Chen,

wang

et al. 2023

Preprint

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A novel IN718 superalloy has been designed based on the commercial IN718 alloy to improve its service performance in the aerospace field. Firstly, first principle calculations were performed to determine the total energy, formation enthalpy, and binding energy of the γ-Ni phase, Laves-Fe2Nb phase, and γ-Ni/Fe2Nb interface model doped with Co, Cr, Mo, V, and Zr atoms in IN718 superalloy. The calculation results reveal the influence of various atoms doping on the typical phases of the IN718 superalloy. Secondly, 8488 group’s suitable alloy composition data were selected from 831600 group’s datasets by D-electron theory and Python programs. Subsequently, the optimal alloy components were determined by thermodynamic calculations using the control variable. Finally, molecular dynamics tensile simulations and mechanical properties tests were conducted to validate the mechanical properties of the optimized superalloy. This entire calculation process serves as a reference for designing other alloy compositions.

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Evolution of dislocation cellular pattern in Inconel 718 alloy fabricated by laser powder-bed fusion

Cited by 10 publications

References 36 publications

Unique Yttria Nanoparticle Strengthening in an Inconel 718 Superalloy Fabricated by Additive Manufacturing

Unique Yttria Nanoparticle Strengthening in an Inconel 718 Superalloy Fabricated by Additive Manufacturing

Role of heterogenous microstructure and deformation behavior in achieving superior strength-ductility synergy in zinc fabricated via laser powder bed fusion

A novel IN718 superalloy of superior mechanical properties designed by the first principle and D-electron theory

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