Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations

Yan, Shuaijiang; Wang, Yun; Wang, Qingxiang; Zhang, Chengsong; Chen, Runsheng; Cui, Guodong

doi:10.3390/ma12203336

Cited by 24 publications

(8 citation statements)

References 45 publications

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“…Figure 4b shows an enlarged view of the 'red square' in Figure 4a, and Figure 4c shows the corresponding EDS mapping results of different chemical elements. It can be seen that Nb, Mo, and Ti are higher in the interdendritic spaces (white phase 2) than the primary dendrites (grey phase 1), which agrees well with the elemental mapping results obtained in previous work [18,19]. Meanwhile, Ni, Cr, and Fe are more prone to aggregating in the dendrite cores.…”

Section: Powder Characterizationsupporting

confidence: 91%

Solution and Double Aging Treatments of Cold Sprayed Inconel 718 Coatings

et al. 2022

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In this study, Inconel 718 coatings were deposited by the high-pressure cold spray technique, and post-process solution and double aging treatments were conducted. The microstructures of the as-deposited and heat-treated IN718 were analyzed, and their mechanical properties were tested. It was found that the micro-dendritic structures in the original powder were severely elongated in the as-deposited IN718 coating due to plastic deformation during the cold spray process. After solution heat treatment, Nb, Mo, and Ti-rich segregations could be dissolved, transforming to MC carbide and a needle-like δ phase. It was found that the needle-like δ phase at the grain boundary had a pinning effect to slow down the grain growth. In addition, strengthening phases could be formed by aging treatments. The mechanical properties of the cold sprayed Inconel 718 could be improved by proper solution and aging heat treatments.

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Section: Powder Characterizationsupporting

confidence: 91%

Solution and Double Aging Treatments of Cold Sprayed Inconel 718 Coatings

et al. 2022

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“…The enlargement of the peaks in 4AH and 1DAH samples was most likely due to the presence of γ′ and γ″ phases. To separate the overlapping peaks and to calculate the volume fractions of γ, γ′, and γ″ phases, the Gaussian fitting method in the Origin software was used in the literature [ 24 , 30 , 31 ]. In this work, the Gaussian fitting method present in the HighScore Plus software was employed.…”

Section: Resultsmentioning

confidence: 99%

Development of Micro Laser Powder Bed Fusion for Additive Manufacturing of Inconel 718

et al. 2022

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The development of laser powder bed fusion (LPBF) additive manufacturing techniques for microfabrication raises the need for the employment of new process configurations and parameters. In this study, micro-LPBF of Ni-based superalloy Inconel 718 using a spot laser of 30 µm was examined. The response surface method with a central composite design was employed to determine the optimum process parameter. A wide range of heat treatment cycles was applied to additively manufacture Inconel samples. The mechanical behavior of heat-treated Inconel 718 parts fabricated via micro-LPBF was investigated and correlated to the microstructural characteristics. The result showed that using optimum input energy density led to a homogenous distribution of nanosized (<10 nm) circular γ′ and plate-like γ″ particles in the γ matrix. Uniaxial tensile tests on heat-treated samples showed that ageing temperature is the most determinant factor in the mechanical strength of additively manufactured Inconel 718.

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“…At higher Mo contents, the value of the lattice mismatch can even be negative. An example of the change in the lattice parameters of the γ, γ′-phase, γ″-phase, and the resulting value of the lattice mismatch δ (%), depending on the temperature and the heat treatment method, is given in Table 3 [ 60 ].…”

Section: Resultsmentioning

confidence: 99%

The Hardness Evolution of Cast and the High-Cycle Fatigue Life Change of Wrought Ni-Base Superalloys after Additional Heat Treatment

et al. 2021

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Concerning the use of modern technologies and manufacturing systems in the production of high-stress components from Ni-base superalloys and the optimization of the production process, knowledge of the microstructure–mechanical properties relationship is very important. The microstructure of Ni-base superalloys is very closely related to the chemical composition. With the high number of alloying elements, various phases are presented in the structure of Ni-base superalloys, which have a predominantly positive effect on the mechanical properties, but also phases that reduce, in particular, the heat resistance of these materials. The aim of the presented paper is the quantification of structural parameters of two types of cast alloys, ZhS6K and IN738, where the effect of dwell at 10 and 15 h at 800 °C on the change in morphology and volume fraction of the γ′-phase precipitate was studied. The detected changes were verified by the Vickers hardness test. The IN718 superalloy was chosen as a representative of the wrought superalloy. This alloy was also annealed for 72 h at a temperature of 800 °C, and the quantification of structural parameters was performed by EDS mapping and TEM analysis. Another partial goal was to assess the effect of changes in the volume fraction of the γ′-phase and δ-phase on the change in the high-cycle fatigue life of superalloy IN 718. This superalloy was tested by dynamic cyclic loading with cycle asymmetry parameter R = −1 at an ambient temperature of 22 ± 5 °C and at a temperature of 700 ± 5 °C and with cycle asymmetry parameter R < 1 (three-point bending load) after annealing at 700 °C/72 h. The results of the quantitative analyses and fatigue tests will be further used in optimizing the design of Ni-base superalloy components by modern technologies such as additive technologies for the production of turbine blades and implemented within the philosophy of Industry 4.0.

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Enhancing Mechanical Properties of the Spark Plasma Sintered Inconel 718 Alloy by Controlling the Nano-Scale Precipitations

Cited by 24 publications

References 45 publications

Solution and Double Aging Treatments of Cold Sprayed Inconel 718 Coatings

Solution and Double Aging Treatments of Cold Sprayed Inconel 718 Coatings

Development of Micro Laser Powder Bed Fusion for Additive Manufacturing of Inconel 718

The Hardness Evolution of Cast and the High-Cycle Fatigue Life Change of Wrought Ni-Base Superalloys after Additional Heat Treatment

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