Characterization and oxidation resistance of additive manufactured and forged IN718 Ni-based superalloys

Juillet, C.; Oudriss, A.; Balmain, J.; Feaugas, X.; Pedraza, F.

doi:10.1016/j.corsci.2018.07.032

Cited by 94 publications

(29 citation statements)

References 22 publications

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“…The values of k p GBO were compared to those estimated based on literature results [1][2][3][7][8][9]16,19,20,29,30,32,[39][40][41][42][43][44][45][46] and plotted in an Arrhenius plot shown in Fig. 9.…”

Section: Gbo Kineticsmentioning

confidence: 99%

Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing

et al. 2020

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The intergranular oxidation in air at 850°C of alloy 718 produced by laser beam melting and electron beam melting was compared to that of the wrought alloy. Quantitative analyses revealed that the amount of grain boundary oxidation was similar for these alloys. However, the additively manufactured ones presented deeper and thicker oxides at grain boundaries, due to grain size heterogeneity and to a smaller number of special boundaries. Results show that intergranular oxidation kinetics follows Wagner's theory on internal oxidation considering not only O diffusion at the intergranular oxide/metal interfaces but also Al and Ti diffusion in the bulk.

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Section: Gbo Kineticsmentioning

confidence: 99%

Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing

et al. 2020

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“…In respect to future improvements, numerical and experimental fluid dynamical analyses will be carried out to check the structural properties of engineered components under different operating conditions [25]. Moreover, a complete thermo-structural design will be conducted for analog rotoric devices and components operating at higher temperatures.…”

Section: Discussionmentioning

confidence: 99%

A General Framework for Designing 3D Impellers Using Topology Optimization and Additive Manufacturing

et al. 2020

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Computer Numerical Control (CNC) milling is still today the elective process for the production of single-piece impellers, as it can reliably produce complex geometries, removing the need for additional manufacturing processes. Nevertheless, Additive Manufacturing is winning more and more ground due to its ability to make components of any geometry that cannot be produced using subtractive techniques. As a result, the use of this technology can eventually be seen as the key to develop high-performance rotor components. In this scenario, the design of 3D impellers does not make an exception. Accordingly, the present paper proposes a general framework for engineered redesign and manufacture of 3D impellers installed on centrifugal compressors by exploiting Topology Optimization and Additive Manufacturing's potential. The procedure investigates also the rotoric component's best configuration for both static and dynamic behavior. Finally, the topology-optimized component is produced with AM through the use of suitable materials that can ensure efficient mechanical efficiency to prove the manufacturability of the entire procedure. To validate the proposed framework, the complete redesign of a 3D impeller of a major Italian-based Oil & Gas company is carried out, demonstrating that the rethinking of the component in terms of Topology Optimization is a straightforward approach to increase the overall performance of the produced rotoric part.

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“…For example, fatigue behavior of IN718 AM structures is well documented in [22]. Similarly, oxidation resistance of IN718 is studied in [23], where a comparison between AM and forging is carried out. Finally, even FE analyses and simulations of the AM process have recently improved and are capable of providing reliable results.…”

Section: Modementioning

confidence: 99%

Design and Production of Innovative Turbomachinery Components via Topology Optimization and Additive Manufacturing

Meli

Rindi

Ridolfi

et al. 2019

International Journal of Rotating Machinery

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The present paper proposes a methodology to design and manufacture optimized turbomachinery components by leveraging the potential of Topology Optimization (TO) and Additive Manufacturing (AM). The method envisages the use of TO to define the best configuration of the rotoric components in terms of both static and dynamic behavior with a resultant reduction of overall weight. Eventually, the topology-optimized component is manufactured by using appropriate materials that can guarantee valid mechanical performances. The proposed strategy has been applied to a 2D impeller used for centrifugal compressors to prove the effectiveness of a TO+AM-based approach. Although this approach has never been extensively used before to centrifugal compressors and expanders, its application on rotor and stator components might unlock several benefits: tuning the natural frequencies, a reduction in the stress level, and a lighter weight of the rotating part. These objectives can be reached alone or in combination, performing a single analysis or a multiple analyses optimization. Finally, the introduction of AM technologies as standard manufacturing resources could bring sensible benefits with respect to the time to production and availability of components. Such aspects are essential in the Oil and Gas context, when dealing with new projects but also for service operations.

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Characterization and oxidation resistance of additive manufactured and forged IN718 Ni-based superalloys

Cited by 94 publications

References 22 publications

Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing

Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing

A General Framework for Designing 3D Impellers Using Topology Optimization and Additive Manufacturing

Design and Production of Innovative Turbomachinery Components via Topology Optimization and Additive Manufacturing

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