Structure-property relationship of a nickel-based honeycomb sealing composite

Fischer, Tim; kyzy, Sonun Ulan; Munz, Oliver; Werner, Ewald

doi:10.1016/j.commatsci.2020.110270

Cited by 10 publications

(5 citation statements)

References 34 publications

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“…However, current modeling approaches treat the brazing Fig. 1 Left: schematic top view of a honeycomb double-foiled segment with capillary braze, right: exemplary microstructure (contrast of back-scattered electrons) of the brazing layer in a honeycomb double-foiled segment with phases similar to those identified by Ulan kyzy et al [5] for brazed Hastelloy X sheets Table 1 Chemical composition of two common base metals used for honeycomb foils as well as the braze metal BNi-5 in mass-%, balance is nickel [ zone as either purely ductile or purely brittle depicted by an elastic material behavior while neglecting the multiphase microstructure in the brazing layer [7,9].…”

Section: Motivation and Current State Of Researchmentioning

confidence: 60%

“…1, right). Previous studies compared Hastelloy X with Haynes 214 as honeycomb liner materials [6,7]. It was shown that the latter alloy leads to higher mechanical and thermal loads on the rotor during a rubbing event.…”

Section: Motivation and Current State Of Researchmentioning

confidence: 99%

“…In this approach, the grain size dependency of the flow stress (Hall-Petch relation) is not transferred to the grains individually as suggested by Meier et al [23] or Fischer et al [6]. Instead, the critical resolved shear stress τ c and the saturation stress τ ∞ are chosen to be the same for all grains in the ductile phase, and their values are set according to the mean equivalent grain diameter using the Hall-Petch constants k c and k ∞ from [7]. It is assumed that the geometrically necessary plastic deformation at the grain boundaries depicted by a spatial jump in the crystallographic orientation in combination with the hardening behavior following the equations ( 5) and ( 6) already accounts for a varying resistance against dislocation slip for grains with distinct sizes.…”

Section: Representative Volume Element Of the Microstructure In A Bra...mentioning

confidence: 99%

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Multiscale modeling of the mechanical behavior of brazed Ni-based superalloy sheet metals

Huber

Vogler

Werner

2022

Continuum Mech. Thermodyn.

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The elastic–plastic behavior of brazed Ni-based superalloys used in abradable turbomachinery sealing systems is analyzed by means of numerical simulations. A sequential multiscale modeling approach is employed to analyze the relevant effects on the mechanical behavior of a layered composite consisting of the braze metal and the joining partners. The focus of the investigations lies on the role of the multiphase microstructure within the brazing layer and the significance of microscopic parameters such as, for example, the volume fraction of the phases compared to macroscopic parameters (e.g., the brazing layer thickness). A representative volume element is employed on the microscale, and a layered composite is modeled on the macroscale to capture all relevant effects on both length scales during mechanical loading of the layered material composite. Virtual tensile tests at different temperatures and strain rates are chosen as a controlled testing environment that captures the characteristic loading conditions during a rubbing event in a turbomachinery. The parameter on the microscale with the highest influence on the mechanical behavior is the volume ratio of the brittle and ductile phases. It also has a significant effect on the macroscopic mechanical behavior. To reduce the risk of damage, it is advised to minimize the fraction of brittle phases in the brazing layer. According to the simulation results, this can be even more effective than reducing the overall thickness of the brazing layer. Additionally, an improvement of an existing analytical model for the estimation of the flow stress in the ductile phase of a dual-phase microstructure is proposed. By increasing the order of the root function in the analytic model, the effect of stress distribution between brittle and ductile phases can be incorporated in an empirical manner. This reduces the deviation between the analytical and the numerical approaches significantly.

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Section: Motivation and Current State Of Researchmentioning

confidence: 60%

Section: Motivation and Current State Of Researchmentioning

confidence: 99%

Section: Representative Volume Element Of the Microstructure In A Bra...mentioning

confidence: 99%

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Multiscale modeling of the mechanical behavior of brazed Ni-based superalloy sheet metals

Huber

Vogler

Werner

2022

Continuum Mech. Thermodyn.

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“…For solving the mechanical boundary value problem, the commercial finite element software Abaqus is used in this work [33]. The crystal plasticity model is embedded through a user material subroutine [34][35][36]. For a more in-depth discussion on the implementation of the constitutive model, interested readers are referred to the work of Reference [32].…”

Section: Constitutive Description Of the Materialsmentioning

confidence: 99%

“…Hence, tailor-made microstructures can be identified for specific loading conditions. A wide range of materials have been investigated so far using this approach, such as dual-phase steels [32] or nickel-based alloys [34,35]. An excellent overview of current applications is given in Reference [32].…”

Section: Virtual Materials Testingmentioning

confidence: 99%

Morphological and Crystallographic Effects in the Laser Powder-Bed Fused Stainless Steel Microstructure

2021

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One of the key aspects in additive manufacturing of stainless steels is the relationship between process parameters and the resulting microstructure. The selected process parameters typically cause a rapid solidification of the material, which leads to a microstructure that is highly textured both morphologically and crystallographically. While the morphological texture is characterised by a mainly columnar shape of the grains, the crystallographic texture is marked by a preferred grain orientation in the <001> direction (fibre texture). Due to the texture effects, pronounced anisotropic mechanical properties are present in the material. In this report, a series of virtual microstructures with different morphological and crystallographic features are generated to develop a fundamental understanding of the individual texture effects on the mechanical properties. The grain morphology is based on Voronoi tessellations, and the crystallographic texture is captured with crystal plasticity. Furthermore, the numerical predictions are compared with experimental studies. The mechanical properties predicted on the basis of the virtual microstructures show that the crystallographic effect is much more dominant than the morphology of the individual grains. Consistent with the experiments, the highest load-bearing capacity of the material occurs when the macroscopic loading acts under an angle of 45∘ to the preferred orientation of the crystals.

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Temperature-dependent mechanical properties and crystal plasticity parameters for additively manufactured Haynes-214 alloy: Experiments and numerical modeling

Keleshteri,

Pourjam,

Mayeur

et al. 2024

Additive Manufacturing

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Structure-property relationship of a nickel-based honeycomb sealing composite

Cited by 10 publications

References 34 publications

Multiscale modeling of the mechanical behavior of brazed Ni-based superalloy sheet metals

Multiscale modeling of the mechanical behavior of brazed Ni-based superalloy sheet metals

Morphological and Crystallographic Effects in the Laser Powder-Bed Fused Stainless Steel Microstructure

Temperature-dependent mechanical properties and crystal plasticity parameters for additively manufactured Haynes-214 alloy: Experiments and numerical modeling

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