Small fatigue crack growth mechanisms of 304 stainless steel under different stress levels

Deng, Guo‐Jian; Tu, S.T.; Wang, Q.Q.; Zhang, X.C.; Xuan, Fu Zhen

doi:10.1016/j.ijfatigue.2014.01.027

Cited by 39 publications

(23 citation statements)

References 22 publications

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“…Short fatigue crack behavior should be considered in the early fatigue crack growth for the material with gradient microstructure [37][38][39]. It was regarded that the length of microstructurally short fatigue crack was approximately ten times of related grain size [40,41].…”

Section: Notch Effectmentioning

confidence: 99%

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Zhang

Xie

Jiang

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TThis paper experimentally investigated the behavior of fatigue crack growth of an axle steel with a surface strengthened gradient microstructure layer. First, the microstructure, residual stress and mechanical properties were examined as a function of depth from surface. Then the fatigue crack growth rate was measured via three point bending fatigue testing. The results indicated that fatigue crack growth rate decelerated first and then accelerated with the increase of crack length within the gradient layer. Especially, the fatigue crack was arrested in the gradient layer under relatively low stress amplitude due to the increase of threshold value for crack growth within the range of 3 mm from surface. Based on these results, the parameters of Paris equation and the threshold value of stress intensity factor range within the gradient layer were determined and a curved surface was constructed to correlate crack growth rate with stress intensity factor range and the depth from surface. The effects of microstructure, residual stress and surface notch on the crack growth behavior were also discussed.

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Section: Notch Effectmentioning

confidence: 99%

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Zhang

Xie

Jiang

et al. 2017

Materials Science and Engineering: A

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“…9. Deng et al (2014) reported that Shim, Takeda and Shoji, Mechanical Engineering Journal, Vol.4, No.4 (2017) [DOI: 10.1299/mej.17-00035] …”

Section: Crack Growth Path In Air At Rtmentioning

confidence: 99%

Fatigue life prediction of 316 stainless steel in simulated PWR primary water by time domain analysis based on short fatigue crack growth behavior

Shim

Takeda

Shoji

2017

Mechanical Engineering Journal

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Fatigue life prediction of 316 stainless steel in simulated PWR primary water by time domain analysis based on short fatigue crack growth behavior AbstractThe fatigue life of austenitic stainless steel is significantly reduced in the environment of a pressurized water reactor (PWR). One of the methods for evaluating the environmental effect involves the use of the environmental correction factor (Fen) determined from the fatigue lives of the material in air and the PWR environment. It has been reported that the environmental correction factor increases with decreasing strain rate, eventually saturating at a low strain rate. However, the exact behavior of the parameter remains unclear considering evidences of a relationship between environmentally assisted fatigue and stress corrosion cracking. It is therefore of importance to examine the possibility of continuity between environmentally assisted fatigue and stress corrosion cracking at very low strain rates. In the present study, time domain analyses of short fatigue cracks initiated in 316 stainless steel in air and simulated PWR water were used to ascertain the existence of such continuity by investigating the relationship between the environmentally assisted fatigue and stress corrosion cracking. The acquired environmentally assisted fatigue life data were uniquely interpreted, and superposition of the plots of the stress corrosion cracking data obtained by slow-strain-rate tensile tests over the time domain analyses and environmentally assisted fatigue data suggested continuity among the parameters. This was clearly substantiated by further time domain analyses.Key words : Short fatigue crack growth behavior, Time domain analysis, Crack initiation, Simulated PWR primary water, Environmentally assisted fatigue, Stress corrosion cracking IntroductionEnvironmentally assisted fatigue (EAF) of structural materials exposed to high temperature, including in the primary water of a pressurized water reactor (PWR), has been studied over the past 30 years. The subject has attracted increased attention in more recent years owing to ongoing efforts toward the long-term operation (LTO) of nuclear power plants for up to 60 years. It is therefore necessary to investigate the safety and structural integrity issues of the long-term operation of a nuclear power plant field, especially regarding the primary coolant system components.Austenitic stainless steel, which is one of the most important structural materials, is utilized in primary pressure boundary components, where it is subjected to low-cycle fatigue (LCF) by repeated start-ups and shut-downs. Since the 1990s, there have been reports about the significance of a PWR environment to reduce the fatigue life of austenitic stainless steel.Both crack initiation and the propagation of a short crack have been investigated through crack initiation tests, with particular interest in the growth behavior of short fatigue cracks. Some fatigue life data are available in the Japan Nuclear Energy Safety Organization (JNES) report and ...

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“…Fatigue tests were interrupted sequentially at a given time interval when a tensile load of 80% of r max was kept to take replicas near the notch. A two-part silicon based replica method, which was proved to be more reliable and convenient than the traditional acetate tape replication method [12,13], was used in this study. A static tip mixing nozzle combined with dispensing gun was used to dispense the replica material onto the notch.…”

Section: Fatigue Testsmentioning

confidence: 99%

“…The incremental polynomial method was used to determine the crack growth rate, which can be seen in Ref. [12]. In this paper, the crack was treated as a semielliptical surface crack and the stress intensity factor range, DK, was calculated using the equation proposed by Newman and Raju, [14], i.e.,…”

Section: Fatigue Testsmentioning

confidence: 99%

Grain size effect on multi-scale fatigue crack growth mechanism of Nickel-based alloy GH4169

Qin

Zhang

et al. 2015

Engineering Fracture Mechanics

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Small fatigue crack growth mechanisms of 304 stainless steel under different stress levels

Cited by 39 publications

References 22 publications

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Fatigue life prediction of 316 stainless steel in simulated PWR primary water by time domain analysis based on short fatigue crack growth behavior

Grain size effect on multi-scale fatigue crack growth mechanism of Nickel-based alloy GH4169

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