Dendritic coarsening model for rapid solidification of Ni-superalloy via electrospark deposition

Enrique, Pablo D.; Jiao, Zhen; Zhou, Norman Y.; Toyserkani, Ehsan

doi:10.1016/j.jmatprotec.2018.03.023

Cited by 16 publications

(3 citation statements)

References 14 publications

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“…The microstructure and measured composition of the as-received In625 and WC-10%Co ESD coatings are shown in Figure 4 (c-d) and (e-f), respectivelywith the hot-stamped coating morphology shown in Figure 4 (g) and (h), respectively. The ESD coating morphology and local composition was complex due to the nature of the ESD process which deposits "splats" of coating material onto the substrate surface [28]. Since the coating electrode was rotating at a high velocity during deposition, it scraped the surface of the substrate upon contact (Figure 1) mixing the Al-Si coating, the steel and the material being deposited from the electrode.…”

Section: ) (Mmentioning

confidence: 99%

The influence of in-situ alloying of electro-spark deposited coatings on the multiscale morphological and mechanical properties of laser welded Al–Si coated 22MnB5

Khan

Enrique

Ghatei-Kalashami

et al. 2022

Materials Science and Engineering: A

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Section: ) (Mmentioning

confidence: 99%

The influence of in-situ alloying of electro-spark deposited coatings on the multiscale morphological and mechanical properties of laser welded Al–Si coated 22MnB5

Khan

Enrique

Ghatei-Kalashami

et al. 2022

Materials Science and Engineering: A

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“…The subgrain size is strongly dependent on the cooling rate, with a measured primary cell spacing ranging from 0.4 to 1.5 μm, indicating that very high cooling rates are present. [19] The morphology of the subgrain is determined by the ratio of the temperature gradient G at the solid/liquid interface to the solidification rate (interface velocity) R. The obtained cellular or cellular dendritic morphology is indicative of a G/R ratio too large to fully form secondary dendrite arms. After an aging heat treatment is applied, the RSP þ aged alloy 718 retains its subgrain microstructure (Figure 3a compared with Figure 3b) that includes the interdendritic eutectic and Laves phases at the subgrain boundaries.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

Effect of Microsegregation on High‐Temperature Microstructure Evolution in Rapid Solidification Processed Nb‐Rich Ni Superalloys

2021

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Rapid solidification processes are used for coating, repairing, and manufacturing of metal alloy components in numerous industries. However, many alloys experience microsegregation of elements at subgrain boundaries at the termination of solidification, which have potential consequences for phase transformations at elevated temperatures if used without homogenization heat treatments. Herein, the effect of this microsegregation and solidification microstructure on the coarsening kinetics of the δ phase in a Nb‐rich Ni superalloy is evaluated. Microsegregation in rapid solidification processed (RSP) alloy 718 results in a greater availability of nucleation sites for the precipitation of the δ phase, resulting in smaller precipitate sizes. Coarsening of the δ phase is found to follow a Lifshitz–Slyozov–Wagner model, which is used to determine that Nb diffusion is the limiting factor in δ phase coarsening. With the formation of the δ phase, and the concurrent coarsening and dissolution of the γ″ strengthening phase, a decrease in both tensile strength and microhardness is observed. An improved understanding of the influence of microsegregation on phase transformations allows for a more informed application of non‐homogenized, RSP alloys in industry.

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“…Electrospark alloying (ESA) as a method of depositing protective coatings on metal surfaces is increasingly used both in Ukraine [4][5][6] and in the near and far abroad [7][8][9][10][11].…”

Section: Literature Reviewmentioning

confidence: 99%

Modeling Technological Parameters for Producing Combined Electrospark Deposition Coatings

Коноплянченко

Tarelnyk

Kozachenko

2019

MSF

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The paper represents a formalized methodology for solving the problem of creating fundamentally new materials, such as "base - coating" ones, which have increased surface wear resistance and relatively high strength and viscosity. Electrospark alloying (ESA) method is proposed as a process for depositing protective coatings on metal surfaces. There are considered the issues of improving the quality of the coatings formed by the ESA method. There is specified a feature of processing the surfaces having been treated with the use of the ESA method, which feature being associated with a relatively small thickness of the layers formed (tens of micrometers). Since to reduce the roughness of the surface, the process of grinding is difficult or even unacceptable to perform, it has been suggested to use the method of surface plastic deformation (SPD). One of the effective SPD methods for finishing the parts is a diamond smoothing process, which, in contrast to running-in with a ball or roller, allows processing the parts of very high hardness values. As a reserve to improve the quality of coatings formed by the ESA method, there is considered a process for producing combined electrospark deposition coatings (CEC) with hard wear-resistant and soft anti-friction metals integrated therein. There are represented the results of mass transfer process investigation performed at forming the CEC on the specimens of steel 45 with indium, tin and copper being used as soft antifriction metals, and tungsten and hard alloy of VK8 grade applied as wear-resistant materials. There is represented a mathematical model for calculating the main ESA technological parameters being necessary for forming the CEC and allowing to predict the weight gain (increase in weight) and size gain (increase in size) at the cathode (the part). It allows predicting the CEC main technological parameters for any electrode pair materials (substrate material and electrode materials making up the CEC).

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Dendritic coarsening model for rapid solidification of Ni-superalloy via electrospark deposition

Cited by 16 publications

References 14 publications

The influence of in-situ alloying of electro-spark deposited coatings on the multiscale morphological and mechanical properties of laser welded Al–Si coated 22MnB5

The influence of in-situ alloying of electro-spark deposited coatings on the multiscale morphological and mechanical properties of laser welded Al–Si coated 22MnB5

Effect of Microsegregation on High‐Temperature Microstructure Evolution in Rapid Solidification Processed Nb‐Rich Ni Superalloys

Modeling Technological Parameters for Producing Combined Electrospark Deposition Coatings

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