Study on creep-fatigue life prediction methods for low-carbon nitrogen-controlled 316 stainless steel (316FR)

Takahashi, Yoshihiro; Shibamoto, Hiroshi; Inoue, Kazuhiko

doi:10.1016/j.nucengdes.2006.09.017

Cited by 50 publications

(28 citation statements)

References 10 publications

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“…For polycrystalline metals, creep damage under creep-fatigue loading is caused by grain boundary cavitation that develops with the accumulation of creep strain under strain holding (e.g., Hales, 1980;Priest and Ellison, 1981;Nam, 2002), and has been macroscopically evaluated in terms of the changes in stress and creep strain under strain holding (e.g., Inoue et al, 1989;Takahashi et al, 2008;Yan et al, 2015). To numerically evaluate creep damage in structural components, it is necessary to use a constitutive model that can accurately simulate the stress-strain behavior under cyclic loading with strain holding.…”

Section: Introductionmentioning

confidence: 99%

“…Priest and Ellison (1981) proposed that creep damage develops when the inelastic strain-rate under strain holding is smaller than the transition rate below which the diffusion creep and grain boundary sliding become important, whereas Hales (1983) considered that the development of creep damage depends on the variations in inelastic strain in three periods under strain holding. Takahashi (1998) and Takahashi et al (2008) adopted the Priest and Ellison (1981) model and decomposed the inelastic strain-rate under strain holding into viscoplastic and creep components occurring at high and low inelastic-strain rates, respectively, and assumed that only the creep component contributes to the development of creep damage. They thus accurately predicted the creep-fatigue lives of 316 stainless steel at 550 • C and 600 • C.…”

Section: Introductionmentioning

confidence: 99%

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Effect of cyclic hardening on stress relaxation in SUS316HTP under creep-fatigue loading at 700ºC: experiments and simulations

Ohno

Sasaki

Shimata

et al. 2018

jtam

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Cyclic hardening and stress relaxation experiments of SUS316HTP were performed under creep-fatigue loading with tensile strain holding at 700• C. Experiments revealed that under strain holding, the slow stress-relaxation stage satisfying Norton's law with slight cyclic hardening followed a rapid stress-relaxation stage that was noticeably affected by cyclic hardening. This suggests that in the slow stress-relaxation stage, inelastic deformation mechanisms different from that of viscoplasticity occurred. Experiments were simulated using a cyclic viscoplastic-creep model in which the inelastic strain-rate was decomposed into viscoplastic and creep components that were affected differently by cyclic hardening. The simulation accurately reproduced the experiments.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of cyclic hardening on stress relaxation in SUS316HTP under creep-fatigue loading at 700ºC: experiments and simulations

Ohno

Sasaki

Shimata

et al. 2018

jtam

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show abstract

“…Researchers proposed many methods of the creep-fatigue evaluation, such as time fraction rules or ductility exhaustion rules (1) (2) . Time fraction rules have been applied in the current design codes for high temperature reactor plants (3) (4) .…”

Section: Introductionmentioning

confidence: 99%

Creep-Fatigue Evaluation by Hysteresis Energy in Modified 9Cr-1Mo Steel

Nagae

Takaya

Asayama

2009

JMMP

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Researchers proposed the methods of creep-fatigue evaluation, such as time fraction rules or ductility exhaustion rules. However, the microstructure change during creep-fatigue should not be directly considered in these methods. The hysteresis energy contributes to the microstructure change before the crack initiation and the crack initiation and propagation. The creep-fatigue has evaluated by the hysteresis energy in modified 9Cr-1Mo steel which is a candidate for structural material in Fast Breeder Reactor (FBR) plant. Creep-fatigue and fatigue tests were carried out at 723-873K in air. The hysteresis energy per hour at the middle of life (N f / 2, N f is the number of cycles to failure) has been evaluated. It is clear that the relationship between this parameter and the time to failure can be expressed by the power-law function. The creep-fatigue life can be evaluated based on the hysteresis energy an hour at N f / 2 using this relation.

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“…(7) are shown in Fig. 3 for testing steel 316FR [11] with a spread of total strains 1, 0.5, and 0.4% at a temperature of 550°C, and also with spreads of 1.0 and 0.5% with a temperature of 600°C. The value of β was taken as 0.7 and 0.1, and the value of q was taken as 0.4 and 0.5 for temperatures of 550 and 600°C, respectively.…”

mentioning

confidence: 99%

“…Treatment of experimental data[11] for steel 316FR: b, ×) without holding at 550 and 600°C; A, e) with holding at 550 and 600°C.…”

mentioning

confidence: 99%

Procedure for structural design for long-term cyclic strength

Khazhinskii¹

2009

Chem Petrol Eng

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A new procedure is proposed for estimating the strength of high-temperature structures taking account of creep and fatigue. This procedure is a further development of the theory of separating the strain cycle into specific components of creep strain and instantaneous ductility (SRP-model). Intergranular and intragranular failure are considered. It is shown that if intergranular failure may only develop during creep, then intragranular failure is connected with both types of strain. A nonlinear equation is obtained for damage summation whose results agree satisfactorily with experimental data with small spreads of total strain.Many elements of power generation equipment operate under conditions of the interaction of creep and fatigue. Considerable attention has been devoted to evaluating the strength of this equipment both in our country and abroad. It is particularly important to resolve this problem for atomic power engineering objects [1][2][3]. Approaches developed in this branch for structural design may be used successfully in planning installations for oil and gas processing, and also chemical production equipment operating under elevated temperature conditions.In [4] on the basis of an SRP-model [5] a procedure was proposed for evaluating material endurance with high-temperature fatigue. In accordance with this procedure, the number of cycles to failure N ƒ is calculated by the equation (1) where D′ p is failure strain amplitude for a prescribed temperature with N ƒ =0.5; c ≈ 0.5; ∆ε equ is the equivalent spread of irreversible strain in a tension half-cycle, determined by the equation ∆ε equ = ∆ε in + λ cp ∆ε cp + λ cc ∆ε cc + λ pc ∆ε pc ;(2) ∆ε in = ∆ε pp + ∆ε cp + ∆ε cc + ∆ε pc is the spread of irreversible strain in a tension half-cycle; ∆ε pp is the spread of instantaneous plastic tensile strain after instantaneous plastic compression; ∆ε pc is the spread of instantaneous plastic tensile strain after instantaneous plastic compression under creep conditions; ∆ε cc is the spread of tensile strain due to creep after compression under creep conditions; ∆ε cp is the spread of tensile strain due to creep after instantaneous plastic compression; λ cp , λ cc , λ pc are strain cycle characteristics. Experiments have shown that the greatest material damage is caused by creep strain in a tension half-cycle when there is no creep in the compression half-cycle (cp-cycle). If in a cycle there are only strains during compression (pc-cycle), ∆ ′ = − ε equ p f c D N 2 2 ( ) ,

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Study on creep-fatigue life prediction methods for low-carbon nitrogen-controlled 316 stainless steel (316FR)

Cited by 50 publications

References 10 publications

Effect of cyclic hardening on stress relaxation in SUS316HTP under creep-fatigue loading at 700ºC: experiments and simulations

Effect of cyclic hardening on stress relaxation in SUS316HTP under creep-fatigue loading at 700ºC: experiments and simulations

Creep-Fatigue Evaluation by Hysteresis Energy in Modified 9Cr-1Mo Steel

Procedure for structural design for long-term cyclic strength

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