Creep Modeling for Life Evaluation of Heat-resistant Steel with a Martensitic Structure

Park, Kyu Seop; Masuyama, Fujimitsu; Endo, Takao

doi:10.2355/isijinternational.41.suppl_s86

Cited by 8 publications

(6 citation statements)

References 3 publications

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“…Initial size of these particles were 70 nm and 20 nm, respectively. In Table 1 the magnitude of strain is also shown although some of the strain values are estimated from the constitutive equations 30) using corresponding experimental conditions.…”

Section: Source Of Analyzed Datamentioning

confidence: 99%

Strain Enhanced Growth of Precipitates during Creep of T91

et al. 2003

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The previous work showed that the precipitate coarsening of T91 (Modified 9Cr-1Mo steel) was described by an empirical relationship depending on applied stress. However, there is another possibility that the stress dependent coarsening is merely apparent and strain dependent actually. In the present paper, an attempt was made to re-analyze the previous data based on a model in which the effective diffusivity of solute is strain dependent. The result of analysis suggests strongly that the dislocation dragging solute atmosphere causes the enhancement of solute diffusivity and leads to the promoted growth of precipitates.

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Section: Source Of Analyzed Datamentioning

confidence: 99%

Strain Enhanced Growth of Precipitates during Creep of T91

et al. 2003

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“…At high temperatures, thermal creep strongly influences the fuel rod behaviour; hence, a reliable evaluation of this phenomenon is necessary. Several correlations can be found in the open literature for T91 (22)(23)(24), some of them (23,24) giving unsuitable predictions in the XADS conditions (temperature range of 350-550 • C, stresses below 80 MPa). The correlation given in (22) has been implemented in the TU code: it results in a good agreement with the experimental data reported in the more recent literature (23,25,26) (Figure 2(a)) even if the temperatures considered in (25,26) are out of the range of the correlation (375-600 • C); the discrepancies at the end of life are due to the tertiary creep not considered in the correlation.…”

Section: Thermo-mechanical Behaviourmentioning

confidence: 97%

Extension of the TRANSURANUS code to the fuel rod performance analysis of LBE-cooled nuclear reactors

Botazzoli

Agosti

Marcello

et al. 2009

Radiation Effects and Defects in Solids

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“…17 Because Grade 91 steel exhibits an extended period of the PC region about 30% of the total creep life, the PC must be considered for improving the accuracy of creep rupture life prediction. 18 Moreover, the strain accumulation in the PC and SC stages is considerable compared to that in the tertiary creep stage. 3 The PC and SC deformation behavior of Grade 91 can be described by coupling constitutive equations, which indicate the kinetics of the process and the evolution of the internal variables.…”

Section: Introductionmentioning

confidence: 99%

Creep life estimation of a service‐exposed P91 cross‐weld joint based on a primary‐secondary creep deformation model

Lok

Yoon

2022

Fatigue Fract Eng Mat Struct

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Creep deformation and rupture behavior of welded joints from service‐exposed P91 steel were investigated by creep tests and microstructure examination. A series of miniature tensile creep tests were conducted at 569°C under applied stresses ranging from 182.5 to 286 MPa for the heat‐affected zone (HAZ), base metal, and weld metal. Creep deformation behavior was modeled using the experimentally measured creep strain data as the primary creep‐secondary creep (PC‐SC) model and fitting closely with the measured creep curves of each metal. Power‐law type creep equations were employed to describe the primary and secondary creep behavior. The creep rupture life of the cross‐weld specimen was predicted using the PC‐SC model with HAZ properties. An accurate prediction was possible if the stress in estimation was increased to 1.14 times of the actual applied stress. The creep test results with the cross‐weld specimens were used for verification. Applying the Monkman–Grant relationship and the creep damage tolerance factors to the cross‐weld joint life prediction are also discussed.

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Creep Modeling for Life Evaluation of Heat-resistant Steel with a Martensitic Structure

Cited by 8 publications

References 3 publications

Strain Enhanced Growth of Precipitates during Creep of T91

Strain Enhanced Growth of Precipitates during Creep of T91

Extension of the TRANSURANUS code to the fuel rod performance analysis of LBE-cooled nuclear reactors

Creep life estimation of a service‐exposed P91 cross‐weld joint based on a primary‐secondary creep deformation model

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