Characterizing crack growth behavior and damage evolution in P92 steel under creep-fatigue conditions

Zhao, Lei; Jing, Hongyang; Gao, Zhifang

doi:10.1016/j.ijmecsci.2017.09.044

Cited by 24 publications

(5 citation statements)

References 59 publications

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“…In these situations, the creep effect may contribute to more damage, and crack growth may take a different direction. This is because the creep damage gradually increases with the crack growing due to increasing number of creep voids, but the fatigue damage gradually decreases during this process [57,58].…”

Section: Limitationsmentioning

confidence: 99%

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Liú

Pons

2018

Metals

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Background-Creep-fatigue damage is generally identified as the combined effect of fatigue and creep. This behaviour is macroscopically described by crack growth, wherein fatigue and creep follow different principles. Need-Although the literature contains many studies that explore the crack-growth path, there is a lack of clear models to link these disparate findings and to explain the possible mechanisms at a grain-based level for crack growth from crack initiation, through the steady stage (this is particularly challenging), ending in structural failure. Method-Finite element (FE) methods were used to provide a quantitative validation of the grain-size effect and the failure principles for fatigue and creep. Thereafter, a microstructural conceptual framework for the three stages of crack growth was developed by integrating existing crack-growth microstructural observations for fatigue and creep. Specifically, the crack propagation is based on existing mechanisms of plastic blunting and diffusion creep. Results-Fatigue and creep effects are treated separately due to their different damage principles. The possible grain-boundary behaviours, such as the mismatch behaviour at grain boundary due to creep deformation, are included. The framework illustrates the possible situations for crack propagation at a grain-based level, particularly the situation in which the crack encounters the grain boundary. Originality-The framework is consistent with the various creep and fatigue microstructure observations in the literature, but goes further by integrating these together into a logically consistent framework that describes the overall failure process at the microstructural level.

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Section: Limitationsmentioning

confidence: 99%

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Liú

Pons

2018

Metals

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“…For crack in creep solids, it is generally denoted as the creep crack to distinguish the cracking in creeping solids and traditionally cracking in elastoplastic solids. For those flawed structures and materials under higher temperature, accurate characterizations and evaluations of crack tip field for creeping solids become a great challenge for industrial and scientific fields, and they are also one of the most important topics in recent years (Saber et al 2016;Xu et al 2017a;Xu et al 2017b;Dai et al 2017;Dai et al 2020a;Chao et al 2001;Wang et al 2010;Tan et al 2014;Ma et al 2016;Cui and Guo 2020;Guo et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Characterizations of material constraint effect for creep crack in center weldment under biaxial loading

et al. 2021

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Material mismatch effect on the cracking behavior is an important topic for those welding structures. Characterization of the material constraint effect based on rigorously asymptotic solution is studied in this paper. Based on decomposition of the second order term, the constraint effect characterization parameter is decomposed as material constraint parameter and geometry constraint parameter. In general, the total constraint level for crack tip under undermatch condition is higher than overmatch condition. The specimen with positive biaxiality could

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“…P91 and P92 steel, which are typical martensitic steels, can be utilized as structural materials for power plant components at 600°C to 620°C . However, the maximum operating temperature of those components needs to increase to 625°C to 650°C to improve further the efficiency, causing the traditional materials to become unsuitable . The G115 steel invented recently in China has much better mechanical properties at elevated temperature than P91 and P92 steel, and it can be utilized in 625°C to 650°C USC power plants …”

Section: Introductionmentioning

confidence: 99%

“…They found a turning stress intensity factor range above which the crack growth rates under different temperatures gather together, except for a test at 750°C. Shi et al and Xu et al investigated the CFCG of P92 steel and showed that the crack growth changed from cycle‐dependent to time‐dependent as the dwell times became longer.…”

Section: Introductionmentioning

confidence: 99%

“…3,8 However, the maximum operating temperature of those components needs to increase to 625°C to 650°C to improve further the efficiency, causing the traditional materials to become unsuitable. 10,11 The G115 steel invented recently in China has much better mechanical properties at elevated temperature than P91 and P92 steel, and it can be utilized in 625°C to 650°C USC power plants. 5,[12][13][14][15][16] The components, such as main steam lines, boilers, and steam turbines, may have crack-like defects resulting from manufacturing.…”

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confidence: 99%

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Stress state and stress‐induced microstructural evolution around the crack tip of G115 steel after dwell‐fatigue crack propagation

Tang

Jing

Zhao

et al. 2019

Fatigue Fract Eng Mat Struct

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Many components operate under creep‐fatigue loading causing an increasing need to learn the knowledge about creep‐fatigue crack growth (CFCG). The stress and microstructural evolution around the crack tip of G115 steel after CFCG were investigated. According to the finite element simulations, the variations of equivalent stress and stress triaxiality in the crack tip zone are presented. Furthermore, the evolutions of martensitic laths, dislocations, and precipitates were systematically studied through electron backscatter diffraction and transmission electron microscopy observations. The laths at the crack tip or under a larger hold time are wider than those remote from the crack tip or under a shorter dwell time. Meanwhile, the dislocation densities reduced significantly at the crack tip or under a larger hold time. The different variations of laths' width and dislocation densities resulted from the different stress triaxiality and creep strain. W‐rich Laves and Cu‐rich phases appeared during CFCG. The Laves phase coarsened rapidly because of the stress‐accelerated diffusion.

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Characterizing crack growth behavior and damage evolution in P92 steel under creep-fatigue conditions

Cited by 24 publications

References 59 publications

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Crack Propagation Mechanisms for Creep Fatigue: A Consolidated Explanation of Fundamental Behaviours from Initiation to Failure

Characterizations of material constraint effect for creep crack in center weldment under biaxial loading

Stress state and stress‐induced microstructural evolution around the crack tip of G115 steel after dwell‐fatigue crack propagation

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