Experimental characterization and two-dimensional simulation of short-crack propagation in an austenitic–ferritic duplex steel

Düber, O.; Künkler, Boris; Krupp, Ulrich; Christ, H.‐J.; Fritzen, Claus‐Peter

doi:10.1016/j.ijfatigue.2005.07.048

Cited by 110 publications

(69 citation statements)

References 22 publications

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“…Studies of fatigue of polycrystalline alloys at grain level indicated that crack nucleation and subsequent transgranular growth tend to follow the slip planes due to the shear deformation associated with the slip systems [e.g., 27,30,35,53]. Along the same line, here it was proposed that crack growth in the grain interior will follow the direction of slip trace with the maximum accumulated slip, which can be computed from the crack-tip deformation analyses.…”

Section: Prediction Of Crack Growth Pathmentioning

confidence: 90%

“…As the material has a fine grain micro-structure, it seems plausible to assume that crack will grow along the slip trace without changing to another direction within the gain. Also, for polycrystalline material, experiment observations show that crack growth tend to follow the slip plane in each grain and a change of crack growth behaviour mostly happens when crossing the grain boundaries due to the change of favourable slip planes [27,30].…”

Section: Prediction Of Crack Growth Pathmentioning

confidence: 99%

“…For crack propagation phase, different size and crystallographic orientation of the grains may also increase, decrease or arrest the crack growth [26][27][28][29]. Also, grain orientation mismatch leads to the change of slip plane across the grain boundaries [30], resulting in a zig-zag pattern for crack growth [31]. In terms of modelling, a combination of crystal plasticity and simplified grain-structure modelling has been applied to study crack tip displacements, crack tip plasticity and crack opening/closure stress [26,[32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Lin

Tong

2011

Engineering Fracture Mechanics

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Crystal plasticity has been applied to model the cyclic constitutive behaviour of a polycrystalline nickel-based superalloy at elevated temperature using finite element analyses.A representative volume element, consisting of randomly oriented grains, was considered for the finite element analyses under periodic boundary constraints. Strain-controlled cyclic test data at 650°C were used to determine the model parameters from a fitting process, where three loading rates were considered. Model simulations are in good agreement with the experimental results for stress-strain loops, cyclic hardening behaviour and stress relaxation behaviour. Stress and strain distributions within the representative volume element are of heterogeneous nature due to the orientation mismatch between neighboring grains. Stress concentrations tend to occur within "hard" grains while strain concentrations tend to locate within "soft" grains, depending on the orientation of grains with respect to the loading direction. The model was further applied to study the near-tip deformation of a transgranular crack in a compact tension specimen using a submodelling technique. Grain microstructure is shown to have an influence on the von Mises stress distribution near the crack tip, and the gain texture heterogeneity disturbs the well-known butterfly shape obtained from the viscoplasticity analysis at continuum level. The stress-strain response near the crack tip, as well as the accumulated shear deformation along slip system, is influenced by the orientation of the grain at the crack tip, which might dictate the subsequent crack growth through grains.Individual slip systems near the crack tip tend to have different amounts of accumulated shear deformation, which was utilised as a criterion to predict the crack growth path.

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Section: Prediction Of Crack Growth Pathmentioning

confidence: 90%

Section: Prediction Of Crack Growth Pathmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Lin

Tong

2011

Engineering Fracture Mechanics

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“…When the stress concentration is high enough to reach the critical value, a dislocation source is activated in adjacent grains and plastic deformation can spread out into those grains, increasing resistance and hardness of deformed material [12] On the other hand, it is known that there is a linear correlation between hydrogen damage susceptibility and hardness value in steels. Therefore, the fine grains formed during hot rolled and quench tempered samples make this steel more prone to crack formation.…”

Section: Microtexture Studymentioning

confidence: 99%

Textural Analysis Through Thickness of Api X70 Steel After Hot Rolling and Post Heat Treatment

Masoumi¹,

Abreu²

2017

Anais Do Seminário De Laminação E Conformação

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In the present study, API 5L X70 pipeline steel samples were deformed by hot-rolling cooled in air or quenched in water and subsequently tempered at different temperatures. X-ray diffraction (XRD) and electron backscatter diffraction (EBSD) technique were used to analyze the texture evolution from the initiate state to rolling and tempering state at mid-thickness and near surface plane of all samples. The results showed that the mid-thickness region is richer in {100}//ND oriented grains known as more susceptible to crack formation and growth through. Hot deformed specimen showed dynamic recrystallization grains while quench tempered sample at 700°C evidenced recovery and grain growth.

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“…Therefore, in recent years, great effort has been made toward exploring a framework within which the information regarding various internal stresses can be incorporated into the design of materials used in various critical industries. [4][5][6] The neutron diffraction technique is a well established tool for studying micromechanical behavior of materials. [7,8] Because of the selective nature of diffraction techniques, the elastic (lattice) strain of the specified grain populations of each phase with their (hkl) crystal planes along the macroscopic specimen directions may be experimentally determined, which enables us to separate the elastic response of different phases during deformation.…”

Section: Introductionmentioning

confidence: 99%

Tensile Deformation Behavior of Duplex Stainless Steel Studied by In-Situ Time-of-Flight Neutron Diffraction

Jia

Peng

Brown

et al. 2008

Metall Mater Trans A

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For a duplex alloy being subjected to deformation, the different mechanical behaviors of its constituent phases may lead to a nonuniform partition of stresses between phases. In addition, the grain-orientation-dependent elastic/plastic anisotropy in each phase may cause grain-tograin interactions, which further modify the microscopic load partitioning between phases. In the current work, neutron diffraction experiments on the spectrometer for materials research at temperature and stress (SMARTS) were performed on an austenite-ferrite stainless steel for tracing the evolution of various microstresses during tensile loading, with particular emphasis on the load sharing among grains with different crystallographic orientations. The anisotropic elastic/plastic properties of the duplex steel were simulated using a visco-plastic self-consistent (VPSC) model that can predict the phase stress and the grain-orientation-dependent stress. Material parameters used for describing the constitutive laws of each phase were determined from the measured lattice strain distributions for different diffraction {hkl} planes as well as the laboratorial macroscopic stress-strain curve of the duplex steel. The present investigations provide in-depth understanding of the anisotropic micromechanical behavior of the duplex steel during tensile deformation.

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Experimental characterization and two-dimensional simulation of short-crack propagation in an austenitic–ferritic duplex steel

Cited by 110 publications

References 22 publications

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

A crystal plasticity study of cyclic constitutive behaviour, crack-tip deformation and crack-growth path for a polycrystalline nickel-based superalloy

Textural Analysis Through Thickness of Api X70 Steel After Hot Rolling and Post Heat Treatment

Tensile Deformation Behavior of Duplex Stainless Steel Studied by In-Situ Time-of-Flight Neutron Diffraction

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