Effect of secondary crystal orientations on the deformation anisotropy for nickel-based single-crystal plate with notch feature

Zhai, Yuling; Khan, Muhammad Kashif; Correia, José A.F.O.; Jesus, Abílio M.P. De; Huang, Zhiyong; Zhang, Xu; Wang, Hongtao

doi:10.1177/0309324718819298

Cited by 7 publications

(3 citation statements)

References 27 publications

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“…The RSS of 30 slip systems based on CPFEM is affected by the slip direction and material anisotropic behavior with crystal orientation. In addition, the crystal yield is controlled by the RSS instead of the equivalent von Mises stress [34]. Figure 11 shows the MRSS on the blade surface under stationary and rotating conditions.…”

Section: Thermal Stress Analysismentioning

confidence: 99%

Numerical Analysis of Conjugated Heat Transfer and Thermal Stress Distributions in a High-Temperature Ni-Based Superalloy Turbine Rotor Blade

et al. 2022

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This paper establishes a multidisciplinary method combining conjugate heat transfer (CHT) and thermal stress for a high-temperature Ni-based superalloy turbine rotor blade with integrated cooling structures. A conjugate calculation is performed to investigate the coolant flow characteristics, heat transfer, and thermal stress of the rotor blade under rotating and stationary conditions to understand the effects of rotation on the multidisciplinary design of the blade. Furthermore, the maximum resolved shear stress among the 30-slip systems and the corresponding dominant slip system are obtained to predict the deformation tendency of the blade by employing the crystal plasticity finite element method (CPFEM) and considering the specified anisotropic blade material (GTD-111). The results show that the forces of rotation, including centrifugal and Coriolis forces, and their induced buoyancy force, alter the coolant flow field and thus affect the rotor blade’s heat transfer distribution compared with the stationary condition. The maximum temperature and thermal stress of the rotor blade under rotating conditions are reduced by 5% and 21% compared with that under the stationary condition, respectively. Compared with the stationary condition, the temperature and thermal stress distribution on the blade under the rotating condition are more uniform, especially on the suction side. In addition, the blade root connecting with the hub, the film holes near the leading-edge region at the blade root, the mid-chord of the suction surface, and the grooved blade tip are easily damaged by the enormous resolved shear stress and the interface effect of different types of dominant slip system under the two conditions. In this work, it was feasible to use the cascade cooling effect test to analyze the dynamic test results for the rotor blade. Furthermore, the thermal stress analysis based on the CPFEM can provide a superior level of blade cooling design than CHT by considering the anisotropic material characteristics of a turbine blade.

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Section: Thermal Stress Analysismentioning

confidence: 99%

Numerical Analysis of Conjugated Heat Transfer and Thermal Stress Distributions in a High-Temperature Ni-Based Superalloy Turbine Rotor Blade

et al. 2022

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“…19,20 Yuan et al 21 concluded that the lifetime of NBSX CMSX-4 under thermal mechanical cyclic loading is significantly affected by the temperature gradient and then proposed a modified model to consider the temperature gradient effect and the thermal-mechanical phase angle. Other factors influencing the fatigue performance of NBSX have also been experimentally and numerically studied, such as the secondary crystal orientation, [22][23][24] mean stress, 25 tension-torsion multiaxial loading, [26][27][28] size effect, 29,30 etc. Porosity size and its distribution are the key factors that affect the fatigue life of NBSXs.…”

Section: Introductionmentioning

confidence: 99%

The porosity distribution of nickel‐base single‐crystal superalloy DD5 and its fatigue life property

Susmel

Jiang³

et al. 2023

Fatigue Fract Eng Mat Struct

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The porosity of nickel-base single crystals (NBSXs) is still an unavoidable casting problem that has a significant influence on the fatigue life of NBSXs. In order to quantify the porosity effect, a porosity-distribution-related life prediction method is proposed in this paper. The porosity size in a NBSX was measured, and the size distribution was regressed. The results show that the porosity size that is characterized by Feret's diameter follows a modified logarithmic normal distribution. The relation among the applied stress, porosity size, and lifetime is expressed by using the proposed method. The disperse band of S-N curve is investigated based on the probability distribution of the porosity size. The results show that the predicted S-N curve agrees well with the experimental data.

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“…Yang et al [20] studied tensile properties of three secondary orientations of [100], [120] and [110] for DD9 NSCS in the temperature range of 760-1100 • C, and showed that the effect of secondary orientation on tensile strength was remarkable. Zhai et al [21] used the finite element method to study the maximum stress of the material with the change of secondary orientation. It was found that the secondary orientation of 45 • has the lowest resolved shear stress, which may lead to higher strength of single crystal turbine blades.…”

Section: Introductionmentioning

confidence: 99%

Modeling of the Effect of Secondary Orientation on the Micro Deformation Behavior of Ni-Based Single Crystal Superalloys

Wei

Song

Zhang

et al. 2022

Metals

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In this paper, a supercell modeling of secondary orientation was established using 90 cubic mosaic units made up of γ’ phase embedded in γ matrix, in accordance with an actual structure of Ni-based single crystal superalloys (NSCS). The effects of secondary orientation on the deformation behavior and microstructure evolution of NSCS under uniaxial tensile were studied by a three-dimensional molecular dynamics (MD) simulation. Simulation results showed that secondary orientation had a significant effect on mechanical properties of NSCS, that is, a big fluctuation was found in tensile strength which dropped down almost 50% from a peak (corresponding to the secondary orientations of 18° and 45°) to a trough (those of 34° and 63°). Mechanisms of secondary orientation affecting the deformation behavior were further discussed systematically. The deformation of NSCS under uniaxial tensile was a process tending towards amorphization of microstructure, together with the dislocation formation, merging and break-up. On a micro viewpoint, this work for us will be useful to apprehend the tensile deformation conduct of NSCS.

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Effect of secondary crystal orientations on the deformation anisotropy for nickel-based single-crystal plate with notch feature

Cited by 7 publications

References 27 publications

Numerical Analysis of Conjugated Heat Transfer and Thermal Stress Distributions in a High-Temperature Ni-Based Superalloy Turbine Rotor Blade

Numerical Analysis of Conjugated Heat Transfer and Thermal Stress Distributions in a High-Temperature Ni-Based Superalloy Turbine Rotor Blade

The porosity distribution of nickel‐base single‐crystal superalloy DD5 and its fatigue life property

Modeling of the Effect of Secondary Orientation on the Micro Deformation Behavior of Ni-Based Single Crystal Superalloys

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