Constitutive modeling of cyclic plasticity at elevated temperatures for a nickel-based superalloy

Shahmardani, Mahdieh; Hartmaier, Alexander

doi:10.1016/j.ijfatigue.2021.106353

Cited by 6 publications

(9 citation statements)

References 37 publications

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“…The constitutive parameters for CMSX-4 have been obtained from a former study. [32] The results highlight that the cyclic plasticity of these two materials can only be captured if proper microstructure-specific kinematic hardening models are considered in the constitutive law. In the case of 316L, the empirical Ohno-Wang kinematic hardening model could reproduce the hardening behavior during cyclic loading and even reflect the Bauschinger effect in the results correctly.…”

Section: Discussionmentioning

confidence: 97%

“…An RVE has been developed based on the microstructure of the 316L and we used the RVE generated in a former study for CMSX-4. [32] These two RVEs have been used in finite element simulations to obtain the macroscopic material response to cyclic loads in form of hysteresis loops that can be directly compared with experiment. A phenomenological constitutive model based on the activation of different deformation and creep mechanisms at different temperatures has been used for CMSX-4 and the behavior of 316L during plastic deformation has been described by a temperature-dependent crystal plasticity model, including terms for nonlinear kinematic hardening.…”

Section: Discussionmentioning

confidence: 99%

“…This RVE includes one central cube of c 0 precipitate enclosed with six half-channels of c matrix to resemble the three-dimensional representation of a single crystal Ni-based superalloy microstructure. [32] In the present work, we adopt this RVE for CMSX-4, see Figure 3, and apply it in the finite element model for further analyses. In the current study, the volume fraction changes in the precipitate and matrix channels at different temperatures are taken into account according to the model presented in Reference 32.…”

Section: Single Crystal Ni-based Superalloymentioning

confidence: 99%

“…3-RVE for CMSX-4 consisting of the precipitate and six matrix channels. [32] . numbers of elements per grain is almost overlapping except at the maximum and minimum stresses, where the differences, however, still can be neglected.…”

Section: Austenitic Steelmentioning

confidence: 99%

“…The Material Parameters for CMSX-4 Defined in the Flow Rule. [32] Parameter Value raising temperatures until the material response is close to an ideal plastic behavior at the highest temperature. Furthermore, the results also indicate that increasing the temperature significantly reduces the material's initial yield strength.…”

Section: A Austenitic Steelmentioning

confidence: 99%

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Microstructure-Sensitive Crystal Plasticity Modeling for Austenitic Steel and Nickel-Based Superalloy Under Isothermal Fatigue Loading

Shahmardani

Hartmaier

2023

Metall Mater Trans A

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Intermittent mechanical loads combined with high temperatures appear during the operation of turbines in jet engines or in power plants, which can lead to high-temperature fatigue or to thermomechanical fatigue. Since the assessment of fatigue properties is a complex and time-consuming process, it is essential to develop validated material models that are capable of predicting fatigue behavior, thus allowing the extrapolation of experimental results into a broader range of thermomechanical conditions. To accomplish this, two representative volume elements (RVEs), mimicking the typical microstructure of single crystal Ni-based superalloys and polycrystalline austenitic steels, respectively, are introduced. With the help of these RVEs, the temperature and deformation-dependent internal stresses in the microstructure can be taken into account. In the next step, phenomenological crystal plasticity models are implemented and parameterized for cyclic deformation of these two materials. The RVE, constitutive model, and the material parameters for the Ni-based superalloy are taken from a former study. For the austenitic steel, however, an inverse procedure has been used to identify its material parameters based on several isothermal fatigue tests in a wide temperature range. With the identified material parameters, a valid description of the isothermal fatigue behavior at different temperatures is possible. The most important conclusion from the comparison of the isothermal fatigue behavior of the two different materials is that the kinematic hardening, which is responsible for the shape of the hysteresis loops, is entirely described by the internal stresses within the typical microstructure of the Ni-based superalloy, which is modeled in a scale-bridging approach. Hence, no additional terms for kinematic hardening need to be introduced to describe the cyclic plasticity in the superalloy. For the austenitic steel, in contrast, the Ohno–Wang model for kinematic hardening needs to be considered additionally to the internal stresses in the polycrystalline microstructure to obtain a correct description of its cyclic plasticity.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 99%

Section: Single Crystal Ni-based Superalloymentioning

confidence: 99%

Section: Austenitic Steelmentioning

confidence: 99%

Section: A Austenitic Steelmentioning

confidence: 99%

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Microstructure-Sensitive Crystal Plasticity Modeling for Austenitic Steel and Nickel-Based Superalloy Under Isothermal Fatigue Loading

Shahmardani

Hartmaier

2023

Metall Mater Trans A

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Experimental Assessment and Micromechanical Modeling of Additively Manufactured Austenitic Steels under Cyclic Loading

et al. 2023

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The present work deals with the cyclic deformation behavior of additively manufactured austenitic stainless steel 316L. Since fatigue experiments are complex and time‐consuming, it is important to develop accurate numerical models to predict cyclic plastic deformation and extrapolate the limited experimental results into a wider range of conditions, considering also the microstructures obtained by additive manufacturing. Herein, specimens of 316L steel are produced by powder bed fusion of metals with laser beams (PBF‐LB/M) with different parameters, and cyclic strain tests are performed to assess their deformation behavior under cyclic loads at room temperature. Additionally, a micromechanical model is set up, based on representative volume elements (RVE) mimicking the microstructure of the experimentally tested material that is characterized by electron backscatter diffraction (EBSD) analysis. With the help of these RVEs, the deformation‐dependent internal stresses within the microstructure can be simulated in a realistic manner. The additively manufactured specimens are produced with their loading axis either parallel or perpendicular to the building direction, and the resulting anisotropic behavior under cyclic straining is investigated. Results highlight significant effects of specimen orientation and crystallographic texture and only a minor influence of grain shape on cyclic behavior.

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A review on the enhancement of failure mechanisms modeling in additively manufactured structures by machine learning

Awd

Saeed

Walther

2023

Engineering Failure Analysis

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Constitutive modeling of cyclic plasticity at elevated temperatures for a nickel-based superalloy

Cited by 6 publications

References 37 publications

Microstructure-Sensitive Crystal Plasticity Modeling for Austenitic Steel and Nickel-Based Superalloy Under Isothermal Fatigue Loading

Microstructure-Sensitive Crystal Plasticity Modeling for Austenitic Steel and Nickel-Based Superalloy Under Isothermal Fatigue Loading

Experimental Assessment and Micromechanical Modeling of Additively Manufactured Austenitic Steels under Cyclic Loading

A review on the enhancement of failure mechanisms modeling in additively manufactured structures by machine learning

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