Physics-based modeling of γ/γ′ microstructure evolution and creep constitutive relation for single crystal superalloy

Guo, Zixu; Huang, Dawei; Yan, Xiangqiao

doi:10.1016/j.ijplas.2020.102916

Cited by 38 publications

(5 citation statements)

References 31 publications

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“…Delicate oxide film at the crack tip was prone to cracking, thereby accelerating the propagation of fatigue cracks. Slip deformation around the FCHs in Ni-based single crystal is mainly affected by the RSS of the main slip system 38 Comparing the multisource oxidative cracks feature and RSS distribution regularity, it can be found that the RSS value of the oxidation crack nucleation position is usually greater than that of the nearby area, as shown in 14F, which also happens to be the main location for oxidation crack nucleation. The above discussion shows that the fatigue crack is easier to nucleate in the region with large RSS around the shaped FCHs.…”

Section: Discussionmentioning

confidence: 97%

“…Delicate oxide film at the crack tip was prone to cracking, thereby accelerating the propagation of fatigue cracks. Slip deformation around the FCHs in Ni‐based single crystal is mainly affected by the RSS of the main slip system 38 (slip plane {111}, slip direction <110>), which indirectly determines the direction of oxidation‐assisted crack initiation and propagation. At 980°C, the Ni‐based single crystal is mainly activated along the octahedral slip system.…”

Section: Discussionmentioning

confidence: 99%

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Research on low‐cycle fatigue behavior of Ni‐based single crystal superalloy with shaped film cooling holes at high temperature

Li,

Wen,

Meng

et al. 2023

Fatigue Fract Eng Mat Struct

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Film cooling holes (FCHs) geometric structure significantly affects low‐cycle fatigue (LCF) of the single crystal turbine blade. This study investigates the LCF behavior of Ni‐based single crystal plate specimens with two different structure FCHs, including elliptical and fan‐shaped FCHs, by high temperature fatigue tests and crystal plasticity simulation. The results show that the LCF life of the fan‐shaped FCHs is shorter than those of the elliptical FCHs. The fracture characteristics and microstructure evolution of different structure FCHs are dissimilar. Oxidation affects the fatigue crack nucleation process at the FCH edge. The resolved shear stress (RSS) around fan‐shaped FCHs is greater than elliptical FCHs under one cyclic stress, and the area with larger RSS is consistent with fatigue crack nucleation position. The early LCF failure is mainly attributed to the high temperature oxidation of the local slip deformation induced by RSS concentration around the FCHs.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Research on low‐cycle fatigue behavior of Ni‐based single crystal superalloy with shaped film cooling holes at high temperature

Li,

Wen,

Meng

et al. 2023

Fatigue Fract Eng Mat Struct

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show abstract

“…Степень рафтинга ξ может быть найдена из следующего соотношения: Наряду с рассмотренными эмпирическими моделями, описывающими процесс эволюции фазового состава, широко представлены термодинамически мотивированные модели [26; 30; 40-42]. Отдельно следует выделить работы, посвященные прямому моделированию процессов эволюции γ/γ'-микроструктуры [43][44][45][46].…”

Section: Introductionunclassified

Modeling of Creep Processes of Single-Crystal Alloys With Taking Into Account of Rafting

Grishchenko

Семенов

2022

PNRPU Mechanics Bulletin

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The research is devoted to the development and verification of a two-level micromechani-cally motivated model of viscoelastic deformation of two-phase nickel-based single-crystal al-loys, predicting behavior under high thermomechanical loading with taking into account the presence of γ and γ' phases. The model is relevant for computations of the stress-strain state of cooled single crystal blades of gas turbine units. The formulation of the constitutive equations for each of the phases considered the anisot-ropy of elastic and viscous properties, the presence of octahedral slip systems, the features of the cubic system, and the presence of viscous properties both below and above the yield stress. Model parameters for γ and γ' phases were identified based on known creep curves for each phase. The effective properties of a single-crystal alloy, considering the presence of γ and γ' phas-es, were determined both based on finite element homogenization for a representative volume and using the simplest rheological (structural) models of the material, considering the series and parallel connection of phases. Based on multivariant computational experiments and analytical estimates, the dependences of the viscoelastic properties of nickel-based single-crystal alloys on the volume fraction of the γ' phase are determined. Phenomenological creep models that take into account the change in the volume fraction and the morphology of γ' inclusions have been proposed. The simulation results using the proposed two-level microstructural model of the material demonstrate a good agreement with the experimental data for the ZhS32 single-crystal heat-resistant alloy.

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“…In literature [21], a modified crystal plasticity constitutive model considering microstructure evolution is developed. In the literature [22], a physics-based model is proposed to predict the γ/γ microstructure evolution of single crystal (SC) superalloy at medium temperature and high stress level. The anisotropy of mechanical properties of nickel-based single crystal materials [5,23] is still a major challenge in the deformation simulation of aerospace engine turbine nickel-based single crystal blades.…”

Section: Introductionmentioning

confidence: 99%

Normalized Parameter Creep Model of DD6 Nickel-Based Single Crystal Superalloy

Wei

Liu

Wang

et al. 2021

Metals

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For nickel-based single crystal superalloy DD6 (AECC Beijing Institute of Aeronautical Materials, Beijing, China) material, a method for predicting creep rupture time was proposed based on a newly defined equivalent stress method. An anisotropic creep model for describing the orientation-dependent creep behavior and lifetime of a nickel-based single crystal superalloy was proposed. The creep subroutine was written based on the proposed nickel-based single crystal creep model. The stability of the model was improved by adjusting the iterative algorithm. The creep calculation results in [001], [011], and [111] loading directions were compared with the experimental results. The accuracy of the calculation results by the nickel-based single crystal creep subroutine was verified. The initial time step and maximum time step of the creep subroutine were studied.

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Physics-based modeling of γ/γ′ microstructure evolution and creep constitutive relation for single crystal superalloy

Cited by 38 publications

References 31 publications

Research on low‐cycle fatigue behavior of Ni‐based single crystal superalloy with shaped film cooling holes at high temperature

Research on low‐cycle fatigue behavior of Ni‐based single crystal superalloy with shaped film cooling holes at high temperature

Modeling of Creep Processes of Single-Crystal Alloys With Taking Into Account of Rafting

Normalized Parameter Creep Model of DD6 Nickel-Based Single Crystal Superalloy

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