Microstructure-informed statistical modelling of cleavage fracture in high strength steels considering through-thickness inhomogeneities

Jiang, Quanxin; Bertolo, Virgínia Morete Barbosa; Popovich, Vera; Sietsma, Jilt; Walters, Carey L.

doi:10.1016/j.engfracmech.2022.108432

Cited by 7 publications

(5 citation statements)

References 45 publications

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“…Under the maximum principal stress criterion for cleavage fracture, σ 1,0 is threshold stress for cleavage fracture initiation to observe the physical consensus on the precedence of plastic yielding over cleavage fracture. [4][5][6][7][8][9][10][11][12][13][14][15][16] The intermediate value theorem for integrals permits to rewrite Equation (6) as:…”

Section: The New Local Approach Modelbased Toughness Correlationmentioning

confidence: 99%

“…Equation (4) reduces to

P goodbreak= 1 goodbreak- italicexp ([], goodbreak- \int_{V_{italicpl}} {(\frac{σ_{1} - σ_{1, 0}}{σ_{0}})}^{m} \cdot \frac{dV}{V_{0}})

where

σ_{1, 0}

is the maximum principal stress at initial yielding of a differential volume element

italicdV

. Under the maximum principal stress criterion for cleavage fracture,

σ_{1, 0}

is threshold stress for cleavage fracture initiation to observe the physical consensus on the precedence of plastic yielding over cleavage fracture 4–16 …”

Section: Cleavage Toughness As a Function Of Specimen Size And Temper...mentioning

confidence: 99%

“…The cleavage fracture toughness exhibits large random variation and strong dependence on temperature and specimen size, owning to the random distribution of carbides and other cleavage nuclei in ferritic steels in terms of size, shape, spatial location, and orientation. This has called for a probabilistic methodology [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] for the assessment and design of ferritic steel structures and for the transference of cleavage fracture toughness data from one specimen size to another. Weibull statistics has been most frequently adopted to characterize and predict cleavage fracture toughness distribution, initially as an empirical approach [1][2][3][4] and later as an attempt to derive it from fracture physics and micromechanics based local approach.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Statistical characterization of specimen size and temperature dependence of cleavage fracture toughness of ferritic steels

Lei,

Qian,

Zhang

2024

Fatigue Fract Eng Mat Struct

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Based on the numerical results on the non‐linear correlation between volume of plastic zone and global loading level represented by stress intensity factor, the dependence of cleavage fracture toughness of ferritic steels on specimen size and temperature is evaluated based on an empirical statistical model. The statistical correlation is supported by two sets of toughness data measured from different sized compact tension specimens at different temperatures. To further improve the accuracy of the statistical model, future work is identified to quantify the variation of volume of plastic deformation zone with loading level and measure the average volume for each microcrack at different temperature.

show abstract

Section: The New Local Approach Modelbased Toughness Correlationmentioning

confidence: 99%

“…Equation (4) reduces to

P goodbreak= 1 goodbreak- italicexp ([], goodbreak- \int_{V_{italicpl}} {(\frac{σ_{1} - σ_{1, 0}}{σ_{0}})}^{m} \cdot \frac{dV}{V_{0}})

where

σ_{1, 0}

is the maximum principal stress at initial yielding of a differential volume element

italicdV

. Under the maximum principal stress criterion for cleavage fracture,

σ_{1, 0}

is threshold stress for cleavage fracture initiation to observe the physical consensus on the precedence of plastic yielding over cleavage fracture 4–16 …”

Section: Cleavage Toughness As a Function Of Specimen Size And Temper...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Statistical characterization of specimen size and temperature dependence of cleavage fracture toughness of ferritic steels

Lei,

Qian,

Zhang

2024

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…[9] Therefore, improving the uniformity of the microstructure and properties in the thickness direction by designing the steel composition and optimizing the hot working process is of great significance for producing extra-thick MES plates. [10][11][12][13] Many recent reports have focused on the optimizing the hot working parameters of steel plates by considering the hot deformation behavior and hot working map technology. Han et al [14] and Mehtonen et al [15] reported that adding a warm rolling process can not only refine the grain size of the thick ferritic stainless steel plate, but also improve its texture.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hot Deformation Behavior of a Marine Engineering Steel for Novel 980 MPa Grade Extra‐Thick Plate

Wang,

Ren,

Liu

et al. 2024

steel research int.

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The hot deformation behavior of a marine engineering steel for a novel 980 MPa grade extra‐thick plate is investigated through hot compression tests at temperatures of 850–1200 °C and strain rates of 0.01–10 s−1. The flow stress curves are corrected to eliminate the effects of friction on the flow stress, and a modified constitutive model is established to accurately quantify the flow behaviors of the steel. Hot working maps of the steel are derived by using a dynamic materials model and the Prasad instability criterion. The effects of the deformation parameters on the dynamic recrystallization (DRX) nucleation mechanisms are evaluated using scanning electron microscopy and electron backscatter diffraction. The flow stress and peak strain increased with decreasing deformation temperature and increasing strain rate, respectively. The activation energy for hot deformation after friction correction is 380.49 kJ mol−1. The DRX mechanism involves the migration of subgrains. The deformation parameters are optimized by combining the degree of DRX and the size of recrystallized grain. The optimum hot working window is determined as 1100–1200 °C and 0.1–10 s−1.

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Cleavage fracture micromechanisms in thick-section quenched and tempered S690 high-strength steels

et al. 2022

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For structural assessment and optimal design of thick-section high-strength steels in applications under harsh service conditions, it is essential to understand the cleavage fracture micromechanisms. In this study, we assess the effects of through-thickness microstructure of an 80-mm-thick quenched and tempered S690 high-strength steel, notch orientation, and crack tip constraint in cleavage nucleation and propagation via sub-sized crack tip opening displacement (CTOD) testing at −100 °C. The notch was placed parallel and perpendicular to the rolling direction, and the crack tip constraint was analysed by varying the a/W ratio: 0.5, 0.25, and 0.1. The notch orientation does not play a role, and the material is considered isotropic in-plane. Nb-rich inclusions were observed to act as the weak microstructural link in the steel, triggering fracture in specimens with the lowest CTOD values. While shallow-cracked specimens from the top section present larger critical CTOD values than deep-cracked ones due to stress relief ahead of the crack tip, the constraint does not have a significant influence in the middle due to the very detrimental microstructure in the presence of Nb-rich inclusions. Some specimens show areas of intergranular fracture due to the combined effect of C, Cr, Mn, Ni, and P segregation along with precipitation of Nb-rich inclusions clusters on the grain boundaries. Several crack deflections at high-angle grain boundaries were observed where the neighbouring sub-structure has different Bain axes.

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Microstructure-informed statistical modelling of cleavage fracture in high strength steels considering through-thickness inhomogeneities

Cited by 7 publications

References 45 publications

Statistical characterization of specimen size and temperature dependence of cleavage fracture toughness of ferritic steels

Statistical characterization of specimen size and temperature dependence of cleavage fracture toughness of ferritic steels

Hot Deformation Behavior of a Marine Engineering Steel for Novel 980 MPa Grade Extra‐Thick Plate

Cleavage fracture micromechanisms in thick-section quenched and tempered S690 high-strength steels

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