Crack growth mechanisms in an aged superalloy at high temperature

Kuhn, F.; Zeismann, F.; Brueckner-Foit, Angelika

doi:10.1016/j.ijfatigue.2013.05.014

Cited by 9 publications

(2 citation statements)

References 12 publications

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“…In order to study the tensile deformation mechanism, electron backscatter diffraction (EBSD) was used to analyze the plastic deformation of the cross section of fracture tips. EBSD can be used to study the relationship between microstructure and plastic deformation, and analyze the distribution of plastic deformation in polycrystalline alloy [34,35] . The applied stress causes dislocation migration and plastic deformation in the alloy, and inhomogeneous distribution of dislocation in grains will lead to inhomogeneous plastic deformation, resulting different local misorientation within grains [36] .…”

Section: Electron Backscatter Diffraction Of Cross Section Of Fracture Tipsmentioning

confidence: 99%

Effect of Carbides and γ/γ' Eutectic on Crack Initiation and Propagation in Ni-based Superalloy

Qin¹,

Chen²,

Chen³

et al. 2020

Res. Appl. Mater. Sci.

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The Ni-based Udemit720Li superalloy tends to form large γ/γ' eutectic on grain boundaries (GBs) during solidification due to the addition of excessive Al and Ti elements, which provides convenience to study the effect of carbide and γ/γ' eutectic on crack initiation and propagation during tensile process. In this paper, Udemit720Li superalloy samples were prepared by induction melting casting method, arc melting and suction casting method. The microstructure, tensile properties and mechanism of crack initiation and propagation in Ni-based superalloy fabricated by two methods are investigated. The results exhibit γ/γ' eutectic accelerates the stress concentration at GB and thus leads to premature fracture failure. The samples with grain-boundary eutectic have higher strain hardening rate, but their cumulative and local misorientations are lower. For samples without eutectic at GB, the primary crack initiates at grain-boundary carbide along GB and extends along GB or into grain matrix, and exhibits better deformation performance and dislocation storage capacity within grains.

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Section: Electron Backscatter Diffraction Of Cross Section Of Fracture Tipsmentioning

confidence: 99%

Effect of Carbides and γ/γ' Eutectic on Crack Initiation and Propagation in Ni-based Superalloy

Qin¹,

Chen²,

Chen³

et al. 2020

Res. Appl. Mater. Sci.

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show abstract

“…Traditional fracture theory assumes that structures are in the plane state ,however, due to the complex of geometry and size the actual structures' failure is a three-dimensional problem [1][2][3] . With the development of fracture mechanics the understanding of crack tip field, micromechanism of crack propagation are getting deeper and deeper [4][5][6][7][8][9][10][11][12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Three Dimensional Criterion for Creep Crack Propagation in C(T) Specimen

Ye¹,

Guo³

et al. 2016

AMM

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Experimental of two kinds of compact tension (CT) specimens’ creep crack propagation are carried out in this paper. Traditional fracture mechanics and three-dimensional fracture theory are compared and the results show that: The K-Tz two-parameter model can eliminate the thickness-effect on the crack growth rates in the relatively low K range, however when K exceed certain values the effect of thickness for crack growth rates still exists; The Ct and Ct-Tz model can describe the thickness-effect of creep crack growth rates in regions of high Ct; When the crack tip stress intensity factor K of the two kinds of thickness (B=5 mm, B=10 mm) specimens equal to 35 and 31 respectively, this material’s creep crack growth control parameter change from K to Ct.

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Testing and evaluation for fatigue crack propagation of Ti-6Al-4V/ELI and 7050-T7452 alloys at high temperatures

Zhu

Xiong

et al. 2018

Chinese Journal of Aeronautics

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Crack growth mechanisms in an aged superalloy at high temperature

Cited by 9 publications

References 12 publications

Effect of Carbides and γ/γ' Eutectic on Crack Initiation and Propagation in Ni-based Superalloy

Effect of Carbides and γ/γ' Eutectic on Crack Initiation and Propagation in Ni-based Superalloy

Three Dimensional Criterion for Creep Crack Propagation in C(T) Specimen

Testing and evaluation for fatigue crack propagation of Ti-6Al-4V/ELI and 7050-T7452 alloys at high temperatures

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