Constitutive modelling of ratcheting behaviour for nickel-based single crystal superalloy under thermomechanical fatigue loading considering microstructure evolution

Fatigue Fract Eng Mat Struct

Liu

et al. 2023

Self Cite

Considering the anisotropy of nickel‐based single crystal superalloy, an anisotropic creep lifetime prediction model based on slip plane damage is developed. The predicted results indicate that the lifetime prediction model could predict the creep lifetimes of nickel‐based single crystal superalloy with different orientations accurately. Furthermore, in order to reveal the damage mechanism of nickel‐based single crystal thin‐walled specimen, creep experiment and failure analysis of thin‐walled specimen are conducted, and there are obvious differences in damage mechanisms between surface and interior of the thin‐walled specimen. In this paper, both thickness debit effect and abnormal thickness debit effect are considered to be caused by the damage differences between surface and interior of the thin‐walled specimen, and zone‐based failure criteria considering thickness debit effect and abnormal thickness debit effect are proposed. Finally, combining the anisotropic creep lifetime prediction model and zone‐based failure criteria, the creep lifetime prediction of DD6 specimen with different thickness is conducted. The predicted lifetimes are within a scatter band of factor 2.26, and the predicted laws between creep lifetimes and thicknesses of the specimens are in good agreement with the experimental results, which verifies the rationality and accuracy of the thickness‐sensitive creep lifetime prediction method established in this paper.

Section: Creep Experiments and Failure Analysis Of Thin‐walled Specimenmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A thickness‐sensitive and orientation‐related creep lifetime prediction method of nickel‐based single crystal superalloy

Zhang

Fatigue Fract Eng Mat Struct

Liu

et al. 2023

Self Cite

“…Although phenomenological lifetime prediction models through fitting experimental data are widely used, they cannot effectively reflect the damage mechanism. By contrast, the physical meaning of damage‐accumulation‐based lifetime prediction models is clear 22–29 . In addition, previous studies reported that the lifetime under LCF loading with tensile dwell time can be predicted through coupling LCF damage and creep damage for the isotropic material at elevated temperature 22–24 .…”

Section: Introductionmentioning

confidence: 97%

“…By contrast, the physical meaning of damage-accumulation-based lifetime prediction models is clear. [22][23][24][25][26][27][28][29] In addition, previous studies reported that the lifetime under LCF loading with tensile dwell time can be predicted through coupling LCF damage and creep damage for the isotropic material at elevated temperature. [22][23][24] When the lifetime prediction models based on damage accumulation are extended to the anisotropic materials such as nickel-based single-crystal superalloys, further consideration and investigation on the crystal-orientation dependence of different damages are required.…”

Section: Introductionmentioning

confidence: 99%

Damage‐based low‐cycle fatigue lifetime prediction of nickel‐based single‐crystal superalloy considering anisotropy and dwell types

Zhang

Fatigue Fract Eng Mat Struct

et al. 2020

Self Cite

Based on the physical phenomenon that the fatigue cracks initiate along specific slip plane, a slip plane damage-based low-cycle fatigue (LCF) lifetime model for the nickel-based single-crystal superalloy is established. The predicted results indicate that the lifetime model can reflect the orientation effect. In addition, in order to characterize the dwell-time dependence of the LCF lifetime, creep damage and compression-creep damage are introduced to the lifetime model. Finally, the lifetime predictions under LCF loading with tensile dwell time, compressive dwell time and tensile-compressive dwell time are conducted by employing the lifetime model, respectively. The predicted lifetimes show a good agreement with the experimental data, which verifies the accuracy of the developed lifetime model in this paper.

“…In literature [20], a homogenization method including modified γ/γ microstructure area surrounding pores and topologically close-packed (TCP) phase particles was developed and correlated to creep life. 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.…”

Section: Introductionmentioning

confidence: 99%

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

Wei

Liu

et al. 2021

Metals

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.