Transitional behavior of fatigue crack growth in welded joint of 25Cr2Ni2MoV steel

Du, Yong; Zhu, Ming‐Liang; Xuan, Fu‐Zhen

doi:10.1016/j.engfracmech.2015.06.065

Cited by 24 publications

(8 citation statements)

References 41 publications

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“…The work of Du et al on the FCG behavior of 25Cr2Ni2MoV base and weld metal will be discussed next. In addition to the effect of welding, they have also considered the effect of heat treatment on the crack growth rates.…”

Section: Resultsmentioning

confidence: 99%

“…A, Crack growth rate, B, Δ K‐R , C, Δ K‐K max of base metal, and D, crack growth rate E, Δ K‐R , F, Δ K‐K max of weld metal [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

“…Crack growth trajectories of 25Cr2Ni2MoV steel extracted from literature [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Resultsmentioning

confidence: 99%

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Analysis of fatigue crack growth behavior of SS 316(N) welds using the unified approach

Babu

Sasikala

Sadananda

2019

Fatigue Fract Eng Mat Struct

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Fatigue crack growth (FCG) behavior of SS 316(N) weld has been evaluated at different R-ratios at room temperature and compared with that of the base metal. The FCG resistance of weld is better than that of the base material and is due to the residual stresses developed during the welding. The data were analyzed using the unified approach that considers the two-parametric (ΔK and K max ) nature of fatigue. The R-ratio effects in both the base and weld metals are accounted for without invoking the extrinsic parameters, such as plasticity-induced crack closure. Since the residual stresses are of the monotonic type, they affect the crack growth via the K max -parameter. The crack growth trajectory plots were developed, and they show how the two crack tip driving forces, ΔK and K max , change to overcome the FCG resistance of the weld in relation to that of the base metal. The results also show that the effects from the compressive residual stresses are more dominant at low R-values and occur via the K max parameter. K E Y W O R D Scrack growth trajectory, effect of welding, fatigue crack growth, residual stresses, SS 316(N) weld, two-parametric approach

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Analysis of fatigue crack growth behavior of SS 316(N) welds using the unified approach

Babu

Sasikala

Sadananda

2019

Fatigue Fract Eng Mat Struct

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“…For large thick-walled turbine rotor steels, narrow-gap SAW and TIG welding techniques are commonly adopted based on multi-layer multi-pass welding processes due to their high deposition efficiency and stable weld quality compared to conventional welding methods. Du et al [10] reported the fatigue properties and microstructure characteristics of welded nuclear power rotor, which proved that narrow-gap SAW (NG-SAW) could be used to fabricate large size rotor. Guo et al [11] mentioned that the connection of dissimilar metals in the turbine rotor was mostly realized by using multi-layer multi-pass welding technology and NG-SAW, because of the good toughness of the welded joint.…”

Section: Introductionmentioning

confidence: 99%

High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor

Wang

Zhu

et al. 2020

Mater. Res. Express

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The high cycle fatigue (HCF) property and microstructure of a dissimilar metal welded joint (DMWJ) for ultra-supercritical steam turbine rotor were systematically investigated in this paper. The DMWJ was fabricated using narrow gap submerged arc welding (NG-SAW) technique with buttering layer. Conditional fatigue strength of 30Cr1Mo1V (BM-1), buttering layer (BL), weld metal (WM) and 30Cr2Ni4MoV (BM-2) based on S-N curve was obtained by HCF tests at room temperature. The microstructure and second-phase carbide as well as fracture appearance of BM-1, BL, WM and BM-2 were characterized by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscope (TEM). The results show that the BL has lower fatigue strength, which are related to more content of the soft ferrite and less content of the hard carbide. The acicular ferrite represents better fatigue properties than massive ferrite due to barrier effect. Additionally, dislocation density sharply increases near the carbides, grain boundaries, and lath structures resulting in dislocation tangle after HCF test, which helps to improve the fatigue strength of the welded joint. The carbide precipitated, aggregated, and grown in the grain boundaries promoted crack nucleation, reduced the crack propagation rate and affected the crack propagation path.

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“…Mann illustrates a comparison of the referred models, which can be found in [39]. Further approaches in regard to the mean stress influence on the crack growth are given in [40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Notch Stress Intensity Factor (NSIF)-Based Fatigue Design to Assess Cast Steel Porosity and Related Artificially Generated Imperfections

Schuscha

Horvath

Leitner

et al. 2019

Metals

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Shrinkage porosities and non-metallic inclusions are common manufacturing process based defects that are present within cast materials. Conventional fatigue design recommendations, such as the FKM guideline (“Forschungskuratorium Maschinenbau”), therefore propose general safety factors for the fatigue assessment of cast structures. In fact, these factors mostly lead to oversized components and do not facilitate a lightweight design process. In this work, the effect of shrinkage porosities on the fatigue strength of defect-afflicted large-scale specimens manufactured from the cast steel G21Mn5 is studied by means of a notch stress intensity factor-based (NSIF-based) generalized Kitagawa diagram. Additionally, the mean stress sensitivity of the material is taken into account and establishes a load stress ratio enhanced diagram. Thereby, the fatigue assessment approach is performed by utilizing the defects sizes taken either from the fracture surface of the tested specimens or from non-destructive X-ray investigations. Additionally, a numerical algorithm invoking cellular automata, which enables the generation of artificial defects, is presented. Conclusively, a comparison to the results of the experimental investigations reveals a sound agreement to the generated spatial pore geometries. To sum up, the generalized Kitagawa diagram, as well as a concept utilizing artificially generated defects, is capable of assessing the local fatigue limit of cast steel G21Mn5 components and features the mapping of imperfection grades to their corresponding fatigue strength limit.

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Transitional behavior of fatigue crack growth in welded joint of 25Cr2Ni2MoV steel

Cited by 24 publications

References 41 publications

Analysis of fatigue crack growth behavior of SS 316(N) welds using the unified approach

Analysis of fatigue crack growth behavior of SS 316(N) welds using the unified approach

High cycle fatigue behavior of a dissimilar metal welded joint in ultra-supercritical steam turbine rotor

Notch Stress Intensity Factor (NSIF)-Based Fatigue Design to Assess Cast Steel Porosity and Related Artificially Generated Imperfections

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