Effects of initial crack positions and load levels on creep failure behavior in P92 steel welded joint

Chen, G.; Wang, Guozhen; Zhang, J.W.; Xuan, Fu‐Zhen; Tu, S.T.

doi:10.1016/j.engfailanal.2014.10.005

Cited by 21 publications

(4 citation statements)

References 27 publications

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“…It is reasonable to regard the maximum principle stress as the equivalent damage stress in a situation of multi-axial stress when the creep damage course is dominated by micro-cracks and cavity mechanism [11][12][13].…”

Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Analysis of Type IV Creep Failure for P91 Steel Welded Joint Based on Thermal Displacement of Steam Pipeline

Zhang¹,

Liu

Tao³

et al. 2022

J. Phys.: Conf. Ser.

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Type IV creep failures tend to occur on fine grained heat affected zone (FGHAZ) of P91 steel welded joint after long-term service at high temperature. In this paper, simulation of finite element is applied to analyze the stress response of the component. Experimental result of stress obtained from real-time monitoring is conducted to verify the simulation. The research results show that the concentration of maximum principal stress is caused by thermal displacement of the piping system. The microstructure of the welded joint is studied by SEM and EDS and the area in which maximum principal stress concentrates is in good agreement with distribution of creep cavity, that is the characteristic of Type IV creep failure in earlier stage. The value of maximum principal stress is improved and the distribution is changed, which are sensitive to thermal displacement cooperation. So thermal displacement that results in accumulation of creep cavity and Type IV cracking is regarded as remarkable factor.

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Section: Analysis Of Simulation Resultsmentioning

confidence: 99%

Analysis of Type IV Creep Failure for P91 Steel Welded Joint Based on Thermal Displacement of Steam Pipeline

Zhang¹,

Liu

Tao³

et al. 2022

J. Phys.: Conf. Ser.

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“…(14) and (16). In addition, the damage accumulation in the interface zone by cavitation is still a displacement-based ductility exhaustion criterion [36][37][38][39][40][41] but is no longer a sole function of the normal creep separation as used in our previous work [8].…”

Section: Interface Region (Creep Cavity Growth)mentioning

confidence: 97%

Effect of weld angle on the creep rupture life of ferritic/austenitic dissimilar weld interfaces under remote mode I fracture

Elmukashfi

Fukahori

et al. 2019

Engineering Fracture Mechanics

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Dissimilar metal welded structures (DMWs) used extensively in conventional and nuclear power plants can suffer from in-service failures at the dissimilar interface with a much reduced life compared to similar metal weld counterparts at the same operating stress and temperature. This paper evaluates the effect of weld angle on the interface creep failure mode of two-dimensional DMW plates consisting of a ferritic steel P91 and an Inconel 82 filler metal within a finite element (FE) framework. A physical cavity growth damage zone model is developed to describe the damage accumulation at the interface, which naturally takes into account the local mode mixity. The material parameters are calibrated against standard 90 o weld creep rupture data and used to predict the rupture life of DMWs with a range of axial loads and reduced weld angles (75 o , 60 o , 45 o and 30 o). The predicted results match reasonably well with the limited interface failure data for a 45 o weld angle. This work also provides additional evidence and insights regarding the improvement of interface creep rupture life of DMWs in power plant pipelines, in particular: (1) Compared with a 45 o weld angle, a 60 o weld angle is more detrimental to the creep life and should be avoided in actual components-on the contrary, damage tolerance can be promoted by designing and adopting weld angles smaller than 45 o , which can have lives exceeding that of standard 90 o welded components; (2) A weld interface with alternating weld angles/paths is expected to enable a greater fraction of the creep rupture life to be taken up with crack propagation compared with a flat weld interface, which also increases the probability of damage detection; (3) A fully constrained boundary condition is beneficial to the creep rupture life compared with a free boundary condition; (4) For weld angles less than 90 o , the diversion of the crack into the HAZ is less likely compared with a 90 o weld angle. Type IV failure mode through the FGHAZ is also less likely to occur.

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“…The material constraint is due to the mismatch effect of creep properties in the welded joint components. There are a number of experimental and numerical studies on the influence of the mismatch effect on the fracture mechanics parameter C* and the CCG rate in welded joints [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Estimation of C* Integral for Mismatched Welded Compact Tension Specimen

Katinić¹,

Turk²,

Konjatić³

et al. 2021

Materials

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The C* integral for the compact tension (CT) specimen is calculated using the estimation equation in ASTM E1457-15. This equation was developed based on the assumption of material homogeneity and is not applicable to a welded CT specimen. In this paper, a modified equation for estimating the C* integral for a welded compact tension (CT) specimen under creep conditions is proposed. The proposed equation is defined on the basis of systematically conducted extensive finite element (FE) analyses using the ABAQUS program. A crack in the welded CT specimen is located in the center of the heat-affected zone (HAZ), because the most severe type IV cracks are located in the HAZ. The results obtained by the analysis show that the equation for estimating the C* integral in ASTM E1457-15 can underestimate the value of the C* integral for creep-soft HAZ and overestimate for creep-hard HAZ. Therefore, the proposed modified equation is suitable for describing the creep crack growth (CCG) of welded specimens.

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Effects of initial crack positions and load levels on creep failure behavior in P92 steel welded joint

Cited by 21 publications

References 27 publications

Analysis of Type IV Creep Failure for P91 Steel Welded Joint Based on Thermal Displacement of Steam Pipeline

Analysis of Type IV Creep Failure for P91 Steel Welded Joint Based on Thermal Displacement of Steam Pipeline

Effect of weld angle on the creep rupture life of ferritic/austenitic dissimilar weld interfaces under remote mode I fracture

Estimation of C* Integral for Mismatched Welded Compact Tension Specimen

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