Modeling and Simulation of Pore Formation in a Bainitic Steel During Creep

Meixner, Felix; Ahmadi, Mohammad Reza; Sommitsch, Christof

doi:10.1007/s11661-021-06569-y

Cited by 3 publications

(3 citation statements)

References 51 publications

(63 reference statements)

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“…The number of nucleation sites at grain boundaries is calculated [53] from average grain diameters, assuming all grains to be tetrakaidekahedral (Table 5). Case studies comparing our model to experimental investigations have been published [42,58].…”

Section: Pore Formation Model: Model Implementationmentioning

confidence: 99%

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Microstructurally Based Modeling of Creep Deformation and Damage in Martensitic Steels

Sommitsch¹,

Sonderegger²,

Ahmadi³

et al. 2023

Failure Analysis - Structural Health Monitoring of Structure and Infrastructure Components

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This chapter deals with modeling the microstructural evolution, creep deformation, and pore formation in creep-resistant martensitic 9–12% Cr steels. Apart from the stress and temperature exposure of the material, the input parameters for the models are as-received microstructure and one single-creep experiment of moderate duration. The models provide predictive results on deformation rates and microstructure degradation over a wide stress range. Due to their link to the underlying fundamental physical processes such as classical nucleation theory, Gibbs energy dissipation, climb, and glide of dislocations, etc., the models are applicable to any martensitic steel with similar microstructure to the presented case study. Note that we section the chapter into part 1: creep deformation and part 2: pore formation.

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Section: Pore Formation Model: Model Implementationmentioning

confidence: 99%

“…Figures 9 and 10 compare simulated results of nucleated cavities with experimental results obtained from secondary electron and density measurements.Case studies comparing our model to experimental investigations have been published[42,58].…”

mentioning

confidence: 99%

Microstructurally Based Modeling of Creep Deformation and Damage in Martensitic Steels

Sommitsch¹,

Sonderegger²,

Ahmadi³

et al. 2023

Failure Analysis - Structural Health Monitoring of Structure and Infrastructure Components

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“…The simultaneous nucleation of new cavities and growth of existing cavities are simulated in a Kampmann-Wagner framework [20]. Elements of our model have been used in previous research with more [21,22] or less [23] success. An understanding of the material properties affecting the nucleation and growth of pores will help in the development of superior materials.…”

Section: Introductionmentioning

confidence: 99%

Cavity Nucleation and Growth in Nickel-Based Alloys during Creep

2022

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The number of fossil fueled power plants in electricity generation is still rising, making improvements to their efficiency essential. The development of new materials to withstand the higher service temperatures and pressures of newer, more efficient power plants is greatly aided by physics-based models, which can simulate the microstructural processes leading to their eventual failure. In this work, such a model is developed from classical nucleation theory and diffusion driven growth from vacancy condensation. This model predicts the shape and distribution of cavities which nucleate almost exclusively at grain boundaries during high temperature creep. Cavity radii, number density and phase fraction are validated quantitively against specimens of nickel-based alloys (617 and 625) tested at 700 °C and stresses between 160 and 185 MPa. The model’s results agree well with the experimental results. However, they fail to represent the complex interlinking of cavities which occurs in tertiary creep.

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