Evaluation of the effect of various prior creep-fatigue interaction damages on subsequent tensile and creep properties of 9%Cr steel

Zhang, Wei; Wang, Xiaowei; Chen, Haofeng; Zhang, Tianyu; Gong, Jianming

doi:10.1016/j.ijfatigue.2019.04.018

Cited by 41 publications

(25 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides the loading mode, the exertion of duration period also influenced the creep‐fatigue performance. The effect of prior CFI damages and prior fatigue damage on remaining tensile and creep properties of 9%Cr steel was studied by Zhang et al 30,31 and revealed the prior performance could significantly reduce tensile strength and creep resistance. When studying the performance of alloy 709, Porter et al 32 and Amrita et al 25 also found that creep‐fatigue life was reduced in comparison with low cycle fatigue life at different temperatures, and more life reduction was observed at low temperature.…”

Section: Introductionmentioning

confidence: 99%

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Zhao

Han

et al. 2020

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

Considering the flexible operation conditions, the creep‐fatigue performance of P92 steel plays a crucial role in manufacturing structural components of ultra‐supercritical fossil power plants at 620°C–630°C. The creep‐fatigue interaction tests of P92 steel were conducted at 630°C in air with different duration periods, where the duration periods were simultaneously added on the peak tensile strain and valley compressive strain. The addition of hold time resulted in a rapid decrease of fatigue life, where the reduction amplitude increasing with the hold time. There was more than five times reduction as the hold time increased to 300 s. Moreover, the stress relaxation behavior during hold time exhibited a saturation behavior at long dwell time, where the limited relaxed stress gradually approached to the creep threshold stress. Furthermore, a modified strain energy density exhaustion model involving creep threshold stress was proposed and provided more accurate predictions in comparison with the conventional model, reducing the conservatism.

show abstract

Section: Introductionmentioning

confidence: 99%

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Zhao

Han

et al. 2020

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Experimental results have revealed that remnant creep properties of P92 steel varied a lot with respect to lifetime fraction, strain amplitude and hold time of prior fatigue loading [13,16,20]. The higher lifetime fraction and strain amplitude the more catastrophic degradation of remnant creep strength was noticed.…”

Section: Resultsmentioning

confidence: 99%

“…Detailed experimental procedures and results have been reported in our previous works [13,16,20], therefore, to avoid a repeated description, only the main experimental procedures and results are presented in the current work. The schematic representation of the experimental procedures is presented in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…and 70% lifetime fraction of 180 s hold time prior C-F loading. This is because as the lifetime fraction of prior C-F loading increases further, apart from the recovery of microstructures, the evident growth of surface cracks takes place [20]. The surface cracks will introduce additional damage on subsequent creep strength and the damage mechanism of prior C-F loading transforms to the combined effect of microstructure evolution and obvious surface cracks.…”

Section: Predictive Capability Of the Proposed Modelmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural damage mechanics-based model for creep fracture of 9%Cr steel under prior fatigue loading

Zhang

Wang

Chen

et al. 2019

Theoretical and Applied Fracture Mechanics

Self Cite

View full text Add to dashboard Cite

Predicting the remnant creep fracture life precisely is crucial for ensuring safety of high temperature components. This study presents a microstructural damage mechanics-based model for creep fracture of 9%Cr steel under prior fatigue loading. Microstructure observation reveals that the decrease of dislocation density and the growth of martensite lath width occurred during prior fatigue process contribute to the degradation of creep strength. Particularly, coarsening of martensite lath width plays the dominated role. To take into account the effect of the prior fatigue loading, kinematic damage equations that represent the evolution of dislocation density and martensite lath are proposed in the developed model. With the proposed model, creep fracture life and creep failure strain at various lifetime factions, strain amplitudes and hold times of prior fatigue loading can be satisfactorily predicted, which manifests that the proposed model is robust in capturing the effects of various prior fatigue loadings. The proposed model is also shown to be able to accurately predict prolonged creep deformation of other similar steel after different prior fatigue loadings.

show abstract

“…Fatigue behaviors at high temperature are the major concerns for service. It is related to the creep-fatigue, low-cycle fatigue (LCF), and high-cycle fatigue (HCF) at the high temperature [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Stress Ratios on the Very High Cycle Fatigue Behavior of 9%Cr Turbine Steel at 630 °C

et al. 2020

Self Cite

View full text Add to dashboard Cite

Effects of the stress ratio on the very high cycle fatigue behaviors of 9%Cr turbine steel have been investigated at 630 °C. The experimental results show that the S–N curve has a continuous downward trend and has no fatigue limit with the increasing in the cycles at 630 °C. Meanwhile, according to the analysis of microstructure, there are two failure modes that were observed at different stress ratios (R = −1 and 0.1), including surface crack failure and internal crack failure, respectively. Besides, the theoretical threshold value of the crack growth is compared with the calculated value of the fracture surface. To decrease the difference between the threshold value of internal crack initiation and the corresponding theoretical value, a new model for the crack growth threshold of the interior-induced fracture at different stress ratios is proposed and discussed.

show abstract

Evaluation of the effect of various prior creep-fatigue interaction damages on subsequent tensile and creep properties of 9%Cr steel

Cited by 41 publications

References 61 publications

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Analysis on stress‐strain behavior and life prediction of P92 steel under creep‐fatigue interaction conditions

Microstructural damage mechanics-based model for creep fracture of 9%Cr steel under prior fatigue loading

The Effect of Stress Ratios on the Very High Cycle Fatigue Behavior of 9%Cr Turbine Steel at 630 °C

Contact Info

Product

Resources

About