Effects of grain size and initial immobile dislocation density on fatigue behavior of polycrystalline metals

Xu, Jin; Zhang, Guangping

doi:10.1016/j.msea.2013.10.015

Cited by 10 publications

(2 citation statements)

References 26 publications

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“…On the other side, it was reported that the dislocation wall formed inside grain depended on grain size [50]. To our knowledge, fatigue crack initiates from slip band at range of mid-to-low stress intensity factor, and thereby the small grain will lead to the difficulty in slip band formation [51,52].…”

Section: Fcp Mechanisms At Fatigue Stage Imentioning

confidence: 99%

Texture effect on fatigue crack propagation in aluminium alloys: An overview

Zhao

Liu

et al. 2019

Materials Science and Technology

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Texture or grain orientation was of crucial importance to fatigue crack propagation (FCP) in aluminium alloys due to boundary character between neighbouring grains and crack closure effect. The current understanding of the relationship among texture, grain size, slipping and crack propagation at fatigue stage I to III was reviewed and discussed. The recommendations for improving FCP resistance were proposed. Intensifying Goss, P and Q textures and moderating these grains were an effective method to improve FCP resistance in Paris regime. However, in stage I, due to the predominated crack closure effect, large grain is beneficial for improving the threshold value of crack propagation. Principally, excellent FCP resistance could be obtained at a balance of crack deflection and crack closure.

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Section: Fcp Mechanisms At Fatigue Stage Imentioning

confidence: 99%

Texture effect on fatigue crack propagation in aluminium alloys: An overview

Zhao

Liu

et al. 2019

Materials Science and Technology

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“…The patterning is observed to depend on the crystal size [6]. On the other hand, simulations performed with a reaction-diffusion 1D continuum model [7] suggested that no clear dislocation wall pattern is formed during cycling when the grain size is below 1 μm and the initial immobile dislocation density is 1 μm −2 . Under these conditions there are no immobile dislocations inside the grain.…”

Section: Introductionmentioning

confidence: 95%

Effect of pre-existing immobile dislocations on the evolution of geometrically necessary dislocations during fatigue

Irastorza-Landa

Grilli

Swygenhoven

2017

Modelling Simul. Mater. Sci. Eng.

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The role of pre-existing mobile and immobile dislocation densities on the evolution of geometrical necessary dislocation densities (GNDs) during cyclic fatigue in shear is studied using a continuum dislocation-based model incorporated in a crystal plasticity finite element scheme. Clusters with different immobile dislocation densities are implemented in a homogeneous medium containing a certain mobile dislocation density. It is found that whether GND walls are formed around the initial immobile cluster (or not) strongly depends on the absolute values of initial mobile dislocation density and on the ratio between mobile and immobile densities. The results are discussed in terms of the apparent GND densities experimentally obtained using Laue micro-diffraction.

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Evaluation of fatigue life of steel using steel grain size

Owsiński

Kamiński

Szymaniec

et al. 2015

Materialwissenschaft Werkst

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The insightful discussion of the relationship between the construction of metallographic and fatigue life and proposition of mathematical relationships describing this relationship was conducted in the paper. This paper presents a method for estimating the fatigue life, based on the construction of the microstructural material taking into account the grain size and the participation of ferrite and pearlite phase.

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Effects of grain size and initial immobile dislocation density on fatigue behavior of polycrystalline metals

Cited by 10 publications

References 26 publications

Texture effect on fatigue crack propagation in aluminium alloys: An overview

Texture effect on fatigue crack propagation in aluminium alloys: An overview

Effect of pre-existing immobile dislocations on the evolution of geometrically necessary dislocations during fatigue

Evaluation of fatigue life of steel using steel grain size

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