Crystal plasticity modeling of polycrystalline Ni-base superalloy honeycombs under combined thermo-mechanical loading

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

doi:10.1007/s00161-018-0721-z

Cited by 15 publications

(6 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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: 64%

“…The geometric tessellation consists of 2000 grains. This is a rather large number of grains compared to studies by other authors [9,17] who employed RVEs consisting of only 150 grains. However, regarding the complex microstructural clusters showing features of different size this is necessary to ensure the representativeness of the volume element.…”

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

confidence: 87%

See 1 more Smart Citation

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

Huber

Vogler

Werner

2022

Continuum Mech. Thermodyn.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Motivation and Current State Of Researchmentioning

confidence: 64%

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

confidence: 87%

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

Huber

Vogler

Werner

2022

Continuum Mech. Thermodyn.

Self Cite

View full text Add to dashboard Cite

show abstract

“…with the characteristic length of the heterogeneities L H , the characteristic length of the volume element L VE , and the macroscopic component scale L M . In the present work, the volume element is found to be sufficiently large to obtain representative results, if it comprises at least 150 grains [61].…”

Section: Virtual Materials Testingmentioning

confidence: 81%

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

2021

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…DAMASK is used by multiple academic and industrial users worldwide. [50][51][52][53][54][55] In this overview article published on the occasion of AEM's 20th anniversary, we present recent application examples showing how DAMASK can be used to investigate the response of metallic microstructures to applied loads. While, due to DAMASKs origin as a crystal plasticity framework, most examples presented here deal with the materials response to mechanical loads, they also demonstrate-along with several recent publications [19,[57][58][59][60] -its capabilities as a multiphysics ICME tool.…”

Section: Introductionmentioning

confidence: 99%

“…The resulting sets of nonlinear internal‐variable differential equations are solved in a fully coupled way using either FEM or spectral‐based FFT solvers. DAMASK is used by multiple academic and industrial users worldwide …”

Section: Introductionmentioning

confidence: 99%

Solving Material Mechanics and Multiphysics Problems of Metals with Complex Microstructures Using DAMASK—The Düsseldorf Advanced Material Simulation Kit

et al. 2020

View full text Add to dashboard Cite

Predicting process–structure and structure–property relationships are the key tasks in materials science and engineering. Central to both research directions is the internal material structure. In the case of metallic materials for structural applications, this internal structure, the microstructure, is the collective ensemble of all equilibrium and nonequilibrium lattice imperfections. Continuum models to derive process–structure and structure–property relationships are based on two ingredients: 1) quantitative state variables that capture the essential features of the material's state and 2) kinetic equations for the state that describe its evolution under load. Successful models, that is, models that are of practical use, depend on state variables and corresponding evolution laws that are sufficiently representative for the microstructure and that are able to describe the phenomena of interest. The development of software tools capable to integrate these different aspects to get a holistic view of process–structure–property relationships requires joint efforts from specialists in different disciplines and a long‐term perspective. The Düsseldorf Advanced Material Simulation Kit (DAMASK) is such a tool. In this overview article published on the occasion of Advanced Engineering Materials' 20th anniversary, some representative application examples which demonstrate how DAMASK can be used to study metallic microstructures at different length scales are presented.

show abstract

Crystal plasticity modeling of polycrystalline Ni-base superalloy honeycombs under combined thermo-mechanical loading

Cited by 15 publications

References 45 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

Solving Material Mechanics and Multiphysics Problems of Metals with Complex Microstructures Using DAMASK—The Düsseldorf Advanced Material Simulation Kit

Contact Info

Product

Resources

About