Significance and Mechanism of the Crack Initiation Process during Very High Cycle Fatigue of Duplex Stainless Steel

Krupp, Ulrich; Giertler, Alexander; Söker, M.; Fu, Hongwang; Dönges, Benjamin; Christ, H.‐J.; Istomin, K.; Hüsecken, A.K.; Pietsch, U.; Fritzen, Claus‐Peter; Ludwig, Wolfgang

doi:10.1016/j.proeng.2014.06.238

Cited by 16 publications

(9 citation statements)

References 8 publications

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“…It was further revealed that the damage initiation is by nature stress state dependent due to the strain localization dependency of stress states. Krupp et al [18] studied the fatigue crack initiation process of duplex stainless steel and quantified the interactions of cracks with the first microstructural barrier. Alharbi et al [19] investigated the stress state of martensite and ferrite before cracking of dual phase DP1000 steel and estimated for crack initiation in the martensite.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Inclusions on the Residual Stress Distribution in High-Strength Martensitic Steels During Cooling

Lian

Bao

et al. 2019

Applied Sciences

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In high-strength martensitic steels, the inclusions significantly affect the material performance especially in terms of fatigue properties. In this study, a numerical procedure to investigate the effect of the inclusions types and shapes on the residual stresses during the cooling process of the martensitic steels is applied systematically based on the scanning electronic microscopy (SEM) and energy dispersive spectrometer (EDS) results of different types of inclusions. The results show that the maximum residual stress around the interface between Mg-Al-O inclusion and the matrix is the largest, followed by TiN, Al-Ca-O-S, and MnS when the inclusions are assumed as perfect spheres for simplicity. However, these results are proved to be 28.0 to 48.0% inaccurate compared to the results considering actual shapes of inclusions. Furthermore, the convex shape of inclusion will lead to stress concentration in the matrix while the concave shape of inclusion will lead to stress concentration in the inclusion. The residual stress increases with the increase of inclusion edge angle. The increase rate is the largest for TiN inclusions on the concave angle, which leads to extreme stress concentration inside TiN inclusion.

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Section: Introductionmentioning

confidence: 99%

Numerical Study of the Effect of Inclusions on the Residual Stress Distribution in High-Strength Martensitic Steels During Cooling

Lian

Bao

et al. 2019

Applied Sciences

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“…Load sharing between both crystallographic phases is observed leading to heterogeneous deformation within the microstructure, with micro-yielding near grain boundaries in the ferrite, augmented by plastic deformation and dislocation pile-ups in the austenite [2,3]. Pitting corrosion [4,5] and crack nucleation [6] is often triggered at such sites, but cracks have also been observed to nucleate at slip bands due to the presence of local differences in elastic anisotropy [7].…”

Section: Introductionmentioning

confidence: 99%

SKPFM measured Volta potential correlated with strain localisation in microstructure to understand corrosion susceptibility of cold-rolled grade 2205 duplex stainless steel

2015

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Highlights: Microstructure information from EBSD analysis has been correlated with SKPFM maps  SKPFM assessment in 38% and 88% relative humidity was carried out  Ferrite and austenite have a Volta potential difference of 70-90 mV  Cold deformation reduced Volta potential differences between ferrite and austenite  Cold deformation produced higher susceptibility at confined microstructure regions AbstractScanning Kelvin Probe Force Microscopy (SKPFM) of annealed and cold-rolled grade 2205 duplex stainless steel has been correlated with microstructure analysis using Electron BackScattered Diffraction (EBSD). In annealed microstructure Volta potential differences indicated micro-galvanic coupling between ferrite and austenite reasoning selective dissolution of ferrite. The introduction of cold work reduced the difference between both phases, but the development of local extremes in Volta potential was observed. Microstructure analysis revealed the presence of larger misorientation concentrations at these sites, which can explain the changes in observed corrosion behaviour, from selective dissolution in the annealed condition to localised corrosion attack after cold-rolling.

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“…Krupp et al . investigated the role of the microstructural barriers in duplex stainless steel X2CrNiMoN22‐5‐3 in more detail.…”

Section: Fundamental Studies In the Very High Cycle Fatigue Regimementioning

confidence: 99%

“…Krupp et al 90,91 investigated the role of the microstructural barriers in duplex stainless steel X2CrNiMoN22-5-3 in more detail. Ultrasonic fatigue tests revealed the existence of a real fatigue limit for this material through experimental evidence.…”

Section: F U N D a M E N T A L S T U D I E S I N T H E V E R Y H I G mentioning

confidence: 99%

Recent developments in ultrasonic fatigue

Mayer¹

2015

Fatigue Fract Eng Mat Struct

150

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The recently increased interest in very high cycle fatigue properties of materials has led to extended use and further development of the ultrasonic fatigue testing technique. Specimens are stimulated to resonance vibrations at ultrasonic frequency, where the high frequency allows collecting lifetime data of up to 1010 cycles and measuring crack propagation rates down to 10−12 m per cycle within reasonable testing times. New capabilities and methods of ultrasonic testing and outstanding results obtained since the year 1999 are reviewed. Ultrasonic tests at load ratios other than R = −1, variable amplitude tests, cyclic torsion tests and methods for in situ observation of fatigue damage are described. Advances in testing at very high temperatures or in corrosive environments and experiments with other than bulk metallic materials are summarized. Fundamental studies with copper and duplex steel became possible and allowed new insights into the process of very high cycle fatigue damage. Higher cyclic strength of mild steels measured at ultrasonic frequency because of plastic strain rate effects are described. High‐strength steels and high‐alloy steels are less prone to frequency influences. Environmental effects that can lead to prolonged lifetimes in some aluminium alloys and possible frequency effects in titanium and nickel and their alloys are reviewed.

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Significance and Mechanism of the Crack Initiation Process during Very High Cycle Fatigue of Duplex Stainless Steel

Cited by 16 publications

References 8 publications

Numerical Study of the Effect of Inclusions on the Residual Stress Distribution in High-Strength Martensitic Steels During Cooling

Numerical Study of the Effect of Inclusions on the Residual Stress Distribution in High-Strength Martensitic Steels During Cooling

SKPFM measured Volta potential correlated with strain localisation in microstructure to understand corrosion susceptibility of cold-rolled grade 2205 duplex stainless steel

Recent developments in ultrasonic fatigue

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