Microstructural and mechanical characterization of injection molded 718 superalloy powders

Özgün, Özgür; Gülsoy, H. Özkan; Yilmaz, Ramazan; Fındık, Fehim

doi:10.1016/j.jallcom.2013.04.042

Cited by 107 publications

(54 citation statements)

References 33 publications

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“…The long axis of single particles is found to be about 22 nm, whereas the short axis is 4 nm, leading to an aspect ratio of 5.5. These characteristics are peculiar to the c 00 phase, as typically present in Inconel 718 after ageing treatments and found by many other researchers irrespective of the manufacturing route [14,23,34,35].…”

Section: Resultssupporting

confidence: 65%

Microstructural design of Ni-base alloys for high-temperature applications: impact of heat treatment on microstructure and mechanical properties after selective laser melting

et al. 2016

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Optimising the microstructure and mechanical performance of Ni-base alloys is vital to achieve higher efficiencies in many high-temperature applications. With the recent emergence of the additive manufacturing technologies, new possibilities with respect to freedom of design and microstructure manipulation are opened up. This study aims at adjusting a microstructure suited for high-temperature applications by employing high-power selective laser melting. The parts are subjected to diverse post-process heat treatments to examine if the desired microstructural features can be preserved and proper precipitations can be formed. Results obtained by electron backscatter diffraction show a high resistance against recrystallization in the temperature range contemplated. Still, process-induced formation of undesired brittle Laves phase particles was observed via transmission electron microscopy and backscattered electron imaging. Mechanical tests in the form of hardness measurements, tensile tests, and high-temperature compression creep tests proved a high dependency of the performance on the post-processing treatment conducted. Hardness, yield strength and elongation at failure at room temperature are adequate in comparison with conventionally processed materials. Hightemperature compression creep tests emphasised the importance of solution annealing to enable for proper precipitation of strengthening phases during subsequent ageing.

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Section: Resultssupporting

confidence: 65%

Microstructural design of Ni-base alloys for high-temperature applications: impact of heat treatment on microstructure and mechanical properties after selective laser melting

et al. 2016

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“…The metal-powder particles obtained by atomization with water have a spherical shape and a diameter d 90 of less than or equal to 32 µm. Inconel is being investigated more and more as a structural alloy for producing aeronautic components by metal-injection molding because of its higher resistance to oxidation, excellent performance at high temperatures (high strength up to 1400 • C), and its impact strength [30,31]. The components' multi-component binder is usually composed of three different ingredients (surfactant, rheofluidifiant, the rigidifying, etc.)…”

Section: Methodsmentioning

confidence: 99%

Modelling and numerical simulation of Supercritical CO2 debinding of Inconel 718 components elaborated by Metal Injection Molding

Agne

Barrière

2017

Applied Sciences

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Featured Application: The numerical simulation of the debinding step by using a supercritical fluid is used to predict the binder extraction to optimize the component's shape.Abstract: A debinding step using the supercritical state of a fluid has been increasingly investigated for extracting organic binders from components obtained by metal-injection molding. It consists of placing the component in an enclosure subjected to pressure and temperatures higher than the critical point to perform polymer extraction of the Metal-injection molding (MIM) component. It is an alternative to conventional solvent debinding. The topic of this study is to model and simulate the supercritical debinding stage to elucidate the mechanism of polymer degradation and stabilization with a three-dimensional model. Modelling this extraction process would optimize the process on an industrial scale. It can be physically described by Fick's law of diffusion. The model's main parameter is the diffusion coefficient, which is identified by using linear regression based on the least-squares method. In the model, an effective length scale is specially developed to take into account the diffusion in all directions. The tests were performed for extracting polyethylene glycol, an organic additive, using supercritical CO 2 in injected components. The feedstock is composed of polypropylene, polyethylene glycol, and stearic-acid as binder mixed with Inconel 718 super-alloy powders. The identified parameters were used to calculate the diffusion coefficient and simulate the supercritical debinding step on the Comsol Multiphysics ® finite-element software platform to predict the remaining binder. The obtained numerical simulation results are in good agreement with the experimental data. The proposed numerical simulations allow for the determination of the remaining polyethylene glycol (PEG) binder distribution with respect to processing parameters for components during the supercritical debinding process at any time. Moreover, this approach can be used in other formulation, powder, and binder systems.

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“…A micro powder was chosen because it is well adapted for µMIM experiments, including injection, debinding and sintering stages [3,10]. The use of Inconel for MIM process has been studied by Özgün [11] and a formulation was developed. Inconel superalloys are used in aviation, aerospace and nuclear power due to their high resistance to corrosion and oxidation but also for their excellent mechanical strength at high temperature [11].…”

Section: Introductionmentioning

confidence: 99%

“…The use of Inconel for MIM process has been studied by Özgün [11] and a formulation was developed. Inconel superalloys are used in aviation, aerospace and nuclear power due to their high resistance to corrosion and oxidation but also for their excellent mechanical strength at high temperature [11]. Currently, the most popular superalloys used for the above applications are Inconel 718 and 625.…”

Section: Introductionmentioning

confidence: 99%

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Development and Characterization of a Metal Injection Molding Bio Sourced Inconel 718 Feedstock Based on Polyhydroxyalkanoates

Royer

Barrière

Gelin

2016

Metals

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Abstract:The binder plays the most important role in the metal injection molding (MIM) process. It provides fluidity of the feedstock mixture and adhesion of the powder to keep the molded shape during injection molding. The binder must provide strength and cohesion for the molded part and must be easy to remove from the molded part. Moreover, it must be recyclable, environmentally friendly and economical. Also, the miscibility between polymers affects the homogeneity of the injected parts. The goal of this study is to develop a feedstock of superalloy Inconel 718 that is environmentally friendly. For these different binders, formulations based on polyethylene glycol (PEG), because of his water solubility property, and bio sourced polymers were studied. Polyhydroxyalkanoates (PHA) were investigated as a bio sourced polymer due to its miscibility with the PEG. The result is compared to a standard formulation using polypropylene (PP). The chemical and rheological behavior of the binder formulation during mixing, injection and debinding process were investigated. The feedstock was characterized in the same way as the binders and the interactions between the powder and the binders were also studied. The results show the well adapted formulation of polymer binder to produce a superalloy Inconel 718 feedstock.

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Microstructural and mechanical characterization of injection molded 718 superalloy powders

Cited by 107 publications

References 33 publications

Microstructural design of Ni-base alloys for high-temperature applications: impact of heat treatment on microstructure and mechanical properties after selective laser melting

Microstructural design of Ni-base alloys for high-temperature applications: impact of heat treatment on microstructure and mechanical properties after selective laser melting

Modelling and numerical simulation of Supercritical CO2 debinding of Inconel 718 components elaborated by Metal Injection Molding

Development and Characterization of a Metal Injection Molding Bio Sourced Inconel 718 Feedstock Based on Polyhydroxyalkanoates

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