Model of transient creep for a ferritic-martensitic steel based on the modified θ-projection method

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Resumo

The paper presents the developed model for predicting the behavior of a ferritic-martensitic steel during all creep stages. A modified θ-projection method is proposed as a solution. The main advantages of the method are abilities to model creep curves for a wide range of temperatures and stresses (which reduces the need for long-term run tests); to validate calculations by determining time to failure; to predict a steady-state creep rate. Despite the usefulness of the proposed approach, certain limitations are noted that result in modeling uncertainties. Higher accuracy and robustness can be achieved using a "mechanical equation of state equation" model of Rabotnov type.

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Sobre autores

А. Kolotovkina

Academician A.A. Bochvar High-Tech Research Institute of Inorganic Materials

Autor responsável pela correspondência
Email: AVKolotovkina@bochvar.ru
Rússia, Moscow, 123098

V. Zborovskii

Lebedev Physical Institute of the Russian Academy of Sciences, Troitsk Branch; National Research Center “Kurchatov Institute”

Email: AVKolotovkina@bochvar.ru
Rússia, Troitsk, Moscow, 108840; Moscow, 123182

M. Leonteva-Smirnova

Academician A.A. Bochvar High-Tech Research Institute of Inorganic Materials

Email: AVKolotovkina@bochvar.ru
Rússia, Moscow, 123098

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2. Fig. 1. Experimental creep curves from the experimental base and the corresponding approximated curves calculated according to (1).

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3. Fig. 2. Dependences of the final actual values ​​of the coefficients θi(i = 1–4) on the stress σ and temperature T, as well as their approximate functional dependencies: a – coefficient θ1; b – coefficient θ2; c – coefficient θ3; d – coefficient θ4.

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4. Fig. 3. Dependences of the steady-state creep rate ε̇ stat on the stress σ and temperature T, as well as the approximate functional dependence.

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5. Fig. 4. Dependences of the creep time to failure τR on the stress σ and temperature T of the obtained creep rates ε̇ stat.

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6. Fig. 5. Scatter plot of experimental and calculated values ​​of creep time to failure τR .

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7. Fig. 6. Experimental and simulated creep curves for the same values ​​of stress σ and temperature T: a – 40 MPa, 943 K; b – 100 MPa, 943 K; c – 50 MPa, 923 K; g – 100 MPa, 923 K; d – 75 MPa, 923 K; f – 14(13) MPa, 1073 K; g – 400 MPa, 773 K; h – 440 MPa, 773 K.

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8. Fig. 7. Modeled and closest experimental creep curves in terms of the combination of stress σ and temperature T.

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