New ECCC assessment of creep rupture strength for steel grade X10CrMoVNb9-1 (Grade 91)

Bendick, W.; Cipolla, L.; Gabrel, J.; Hald, John

doi:10.1016/j.ijpvp.2010.03.010

Cited by 59 publications

(37 citation statements)

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“…[19] Eq. [8] is experimentally confirmed for Gr.91 over a wide range of test temperature and test duration, as shown in Figure 12, where the results for 9Cr-boron steel, [46] Gr.92 (9Cr-0.5Mo-1.8W-VNb steel), [47] and Gr.122 (11Cr-0.4Mo-2W-1CuVNb steel) [48] are also shown. Eq.…”

Section: A Creep Life Equation Based On Creep Behavior In Transient mentioning

confidence: 58%

“…Eq. [8] with c = 1.5 has already reported for tempered martensitic 9Cr-(0-4)W-0.1C steels [19,20] and austenitic steels. [43] The present results indicate that the time to rupture is reasonably correlated with the creep deformation parameters _ e min and dln_ e/de, which reflect the creep deformation behavior in the transient and acceleration regions, respectively.…”

Section: A Creep Life Equation Based On Creep Behavior In Transient mentioning

confidence: 80%

“…[1,6,7] The stress extrapolation makes it difficult to evaluate long-term creep life of CSEF steels correctly. The new analysis methods, such as International Standard Organization Creep Rupture Data Assessment (ISO CRDA) method, [8] Wilshire and Sharning method, [9] region splitting analysis method, [10] and multi-region analysis method, [11] have been proposed as more reliable methods than the conventional TTP methods.…”

Section: Introductionmentioning

confidence: 99%

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Creep Behavior, Deformation Mechanisms, and Creep Life of Mod.9Cr-1Mo Steel

Abe

2015

Metall Mater Trans A

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The creep behavior, deformation mechanisms, and the correlation between creep deformation parameters and creep life have been investigated for Mod.9Cr-1Mo steel (Gr.91, 9Cr-1Mo-VNb) by analyzing creep strain data at 723 K to 998 K (450°C to 725°C), 40 to 450 MPa, and t r = 11.4 to 68,755 hours in NIMS Creep Data Sheet. The time to rupture t r is reasonably correlated with the minimum creep rate _ e min and the acceleration of creep rate by strain in the acceleration region dln_ e/de, as t r = 1.5/[_ e min (dln_ e/de)], where _ e min and dln_ e/de reflect the creep behavior in the transient and acceleration regions, respectively. The _ e min is inversely proportional to the time to minimum creep rate t m , while it is proportional to the strain to minimum creep rate e m , as _ e min = 0.54 (e m /t m ). The e m decreases with decreasing stress, suggesting that the creep deformation in the transient region becomes localized in the vicinity of prior austenite grain boundaries with decreasing stress. The duration of acceleration region is proportional to the duration of transient region, while the dln_ e/de is inversely proportional to the e m . The t r is also correlated with the t m , as t r = g t m , where g is a constant. The present creep life equations reasonably predict the degradation in creep rupture strength at long times. The downward deviation takes place in the t r vs _ e min curves (Monkman-Grant plot). At the same _ e min , both the e m and t m change upon the condition of t m µ e m . The decrease in e m with decreasing stress, corresponding to decreasing _ e min , causes a decrease in t m , indicating the downward deviation of the t r vs _ e min curves.

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Section: A Creep Life Equation Based On Creep Behavior In Transient mentioning

confidence: 58%

Section: A Creep Life Equation Based On Creep Behavior In Transient mentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Creep Behavior, Deformation Mechanisms, and Creep Life of Mod.9Cr-1Mo Steel

Abe

2015

Metall Mater Trans A

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“…The applications show the short-term creep behaviors and the life span of materials could be predicted accurately, at least for uni-axial case. However, the extrapolation of short-term creep data to long-term situation results in overestimation in general, and these models are more sensitive to high Cr alloy than the low Cr alloy [1][2][3]. Therefore, Bendick, et al [4] re-assessed the database due to the significant increase in test data, and a predicted duration of 105h for P91 steels, the updated value is 90 MPa at 600oC.…”

Section: Introductionmentioning

confidence: 99%

“…However, the extrapolation of short-term creep data to long-term situation results in overestimation in general, and these models are more sensitive to high Cr alloy than the low Cr alloy [1][2][3]. Therefore, Bendick, et al [4] re-assessed the database due to the significant increase in test data, and a predicted duration of 105h for P91 steels, the updated value is 90 MPa at 600oC. To develop a new set of constitutive equations model is necessary to understand the cavitation better in order to describe the creep damage and rupture under low stress level.…”

Section: Introductionmentioning

confidence: 99%

Analyzing the Characteristics of the Cavity Nucleation, Growth and Coalescence Mechanism of 9Cr-1Mo-VNb Steel (P91) Steel

et al. 2013

AMR

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Abstract. Creep damage is one of the serious problems for the high temperature industries and computational approach (such as continuum damage mechanics) has been developed and used, complementary to the experimental approach, to assist safe operation. However, there are no ready creep damage constitutive equations to be used for predicting the lifetime for this type of alloy, particularly for low stress. This paper presents an analysis of the cavity nucleation, growth and coalescence mechanism of 9Cr-1Mo-VNb steel (P91 type) under high and low stress levels and multi-axial stress state.

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Probabilistic creep rupture life evaluation of T91 alloy boiler superheater tubes influenced by steam‐side oxidation

Huang

Zhou

et al. 2013

Materials & Corrosion

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A systematic probabilistic evaluation method for the long‐term creep rupture life (LCL) of T91 alloy superheater tubes is proposed in this work. The effects of steam‐side oxidation on the effective load‐bearing thickness and temperature of tube wall are taken into account, and the latest assessment results of the creep rupture strength of T91 alloy are utilized. Since the uncertain factors including not only the geometry dimensions but also the operational conditions may hinder a reliable analysis, instead of usual deterministic methods, probabilistic life evaluation employing Monte Carlo simulation method is performed. The effects of initial inner tube diameter, steam temperature, and steam flow on the LCL of superheater tubes are analyzed, and simple fitting functions formulating the analysis results are obtained. The survival probability of the tubes, which reflects the possibility for the LCL to be longer than a given time, is calculated. It is found that when the initial inner tube diameter or the steam temperature increases, the survival probability of the tubes exhibits a decrease trend. However, the steam flow has an opposite effect. Based on the conclusions, feasible measures that can be adopted to improve the survival probability of high temperature steam generation components in coal‐fired power plants are introduced.

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New ECCC assessment of creep rupture strength for steel grade X10CrMoVNb9-1 (Grade 91)

Cited by 59 publications

References 1 publication

Creep Behavior, Deformation Mechanisms, and Creep Life of Mod.9Cr-1Mo Steel

Creep Behavior, Deformation Mechanisms, and Creep Life of Mod.9Cr-1Mo Steel

Analyzing the Characteristics of the Cavity Nucleation, Growth and Coalescence Mechanism of 9Cr-1Mo-VNb Steel (P91) Steel

Probabilistic creep rupture life evaluation of T91 alloy boiler superheater tubes influenced by steam‐side oxidation

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