Quantitative description between pre-fatigue damage and residual tensile properties of P92 steel

Wang, Xiaowei; Zhang, Wei; Ni, Junyan; Zhang, Tianyu; Gong, Jianming; Wahab, Magd Abdel

doi:10.1016/j.msea.2018.12.029

Cited by 40 publications

(19 citation statements)

References 49 publications

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“…During fatigue process of 9%Cr steel, the cyclic softening occurs, which has been validated by many studies (Fournier et al, 2011;Shankar et al, 2006). The microstructure evolution (recovery of martensite lath structure and decrease of dislocation density) contributes to the softening behaviour and results in alternation of inelastic strain range in the fatigue process (Wang et al, 2019). The typical strain-controlled strain-stress hysteresis loop and inelastic strain range of 9%Cr steel during LCF and C-F processes are shown in Figs.…”

Section: Fatigue Damage Parametermentioning

confidence: 56%

“…Experimental observations have demonstrated that the remnant tensile properties of P92 steel are reduced by prior fatigue loading and the reduction level is related to lifetime fraction, strain amplitude and hold time (Wang et al, 2019;, as typically presented in Fig. 3 (engineering tensile curves).…”

Section: Resultsmentioning

confidence: 79%

“…4. The decline in dislocation density during prior fatigue process was mainly responsible for the phenomenon (Wang et al, 2019). Due to the reduction of dislocation density after prior fatigue loading, the dislocation strengthening is decreased, and therefore the resistance of the material to deformation decreased.…”

Section: Resultsmentioning

confidence: 98%

“…The experiments conducted in the present study aim to evaluate the accuracy and the capacity of the proposed model. However, to avoid a repeated description of experimental methodology that has been elaborately depicted in our previous works (Wang et al, 2019;, only the main experimental methods and results are presented in the current study. The experimental procedures are schematically shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Consequentially, it may be reasonable to utilize the inelastic strain range to evaluate the fatigue damage. Based on the inelastic strain range in the first cycle and failure cycle, a fatigue damage parameter was defined in our previous works (Wang et al, 2019; and is given as:…”

Section: Fatigue Damage Parametermentioning

confidence: 99%

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A modified constitutive model for tensile deformation of 9%Cr steel under prior fatigue loading

Zhang

Wang

Chen

et al. 2019

Mechanics of Materials

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Reliable constitutive models are necessary for the precise design and manufacture of complicated components. This study is devoted to developing a modified constitutive model to capture the effects of prior fatigue loading on subsequent tensile deformation of 9%Cr steel. In the proposed model, a strain hardening rule combined with a defined fatigue damage parameter were introduced to represent prior fatigue damage. The defined fatigue damage parameter based on the inelastic strain range of each cycle is capable of describing the evolution of tensile strength, recovery of martensite laths and decline of dislocation density, regardless of the variation in fatigue loading conditions. To validate the predictive capacity of the proposed model, experimental tensile results at different strain amplitudes, lifetime fractions and hold times of prior fatigue loading were compared with the predicted results. Good agreement between experimental and predicted results indicates that the proposed model is robust in describing the tensile behaviour under prior 2 fatigue loading. Moreover, few determined material parameters are required, which makes the proposed model convenient for practical applications.

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Section: Fatigue Damage Parametermentioning

confidence: 56%

Section: Resultsmentioning

confidence: 79%

Section: Resultsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Section: Fatigue Damage Parametermentioning

confidence: 99%

See 3 more Smart Citations