Deformation Features of the Propagation of Cleavage Cracks in a Ferritic-Pearlite Microstructure in the Ductile to Brittle Transition Interval

Кантор, М. М.; Sudin, V. V.; Solncev, K. A.

doi:10.1134/s0020168521060042

Cited by 5 publications

(5 citation statements)

References 19 publications

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Section: Discussionsupporting

confidence: 74%

“…Similar results were obtained in [49]. In a study of the deformation characteristics of the cleavage crack propagation in a 09G2S low-alloy low-carbon steel with a ferrite-pearlite microstructure, it was shown [49] that the deformation accompanying the cleavage crack growth was formed when the joints between cracks propagating in parallel planes were broken. The crack grows within one plane without detectable deformation, and the joints rupture by a ductile mechanism (according to the scheme of mixed loading by separation and shear).…”

Section: Discussionsupporting

confidence: 74%

“…The crack grows within one plane without detectable deformation, and the joints rupture by a ductile mechanism (according to the scheme of mixed loading by separation and shear). As noted by the authors of [49], the degree of overlap of cleavage cracks determines the relationship between the shear mode and the detachment mode during a joint deformation, which controls the shape and depth of plastic deformation zones.…”

Section: Discussionmentioning

confidence: 98%

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The Cold-Brittleness Regularities of Low-Activation Ferritic-Martensitic Steel EK-181

Polekhina,

Osipova,

Litovchenko

et al. 2023

Metals

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The behavior of the EK-181 low-activation ferritic-martensitic reactor steel (Fe–12Cr–2W–V–Ta–B) in the states with different levels of strength and plastic properties after traditional heat treatment (THT) and after high-temperature thermomechanical treatment (HTMT) in the temperature range from −196 to 25 °C, including the range of its cold brittleness (ductile–brittle transition temperature, DBTT) is studied. The investigations are carried out using non-destructive acoustic methods (internal friction, elasticity) and transmission and scanning electron microscopy methods. It is found that the curves of temperature dependence of internal friction (the vibration decrement) of EK-181 steel after THT and HTMT are similar to those of its impact strength. Below the ductile–brittle transition temperature, it is characterized by a low level of dislocation internal friction. The temperature dependence curves of the steel elastic modulus increase monotonically with the decreasing temperature. In this case, the value of Young’s modulus is structure-sensitive. A modification of the microstructure of EK-181 steel as a result of HTMT causes its elastic modulus to increase, compared to that after THT, over the entire temperature range under study. The electron microscopic studies of the steel microstructure evolution near the fracture surface of the impact samples (in the region of dynamic crack propagation) in the temperature range from −196 to 100 °C reveal the traces of plastic deformation (increased dislocation density, fragmentation of the martensitic structure) at all of the temperatures under study, including those below the cold brittleness threshold of EK-181 steel.

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Section: Discussionsupporting

confidence: 74%

Section: Discussionsupporting

confidence: 74%

Section: Discussionmentioning

confidence: 98%

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The Cold-Brittleness Regularities of Low-Activation Ferritic-Martensitic Steel EK-181

Polekhina,

Osipova,

Litovchenko

et al. 2023

Metals

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“…In accordance with the concepts outlined in [19], the intrinsic steel toughness value at each test temperature is the maximum impact toughness value, which could be obtained in the material without any additional microstructural defects. The impact toughness scattering is generated by microstructure defects [32]. Therefore, it can be assumed that the undisclosed secondary microcracks formation will be one of the reasons for impact toughness scattering.…”

Section: Discussionmentioning

confidence: 99%

The Role of Splitting Phenomenon under Fracture of Low-Carbon Microalloyed X80 Pipeline Steels during Multiple Charpy Impact Tests

et al. 2022

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The ambiguity of the splitting effect on X80 low-carbon microalloyed pipeline steels’ tendency towards brittle fracture prompted an experimental study of impact toughness scattering based on multiple Charpy impact tests in a temperature range from 20 °C to −100 °C. A fractographic analysis of a large number of fractured samples was carried out. The relationships between impact toughness, deformability and splitting characteristics were studied. A number of common features of three X80 low-carbon microalloyed pipeline steel fractures were revealed. It was experimentally established that the reason for the scattering of the impact toughness values during completely ductile fracture of specimens, as well as during fracture accompanied by the splitting formation, is the local inhomogeneity of plastic properties. The higher the susceptibility to the formation of splits for a particular steel, the lower the impact toughness. Using the electron backscatter diffraction (EBSD) technique, an uneven distribution of local plasticity in the plastic zone of impact-fractured specimens was established. A comparative analysis of specimens with equal impact toughness values at different test temperatures makes it possible to identify the mechanism of negative splitting influence compensation by the increased plasticity of certain specimen.

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“…What are the sizes of primary nanocracks of atomically smooth metals? This question is a complicated one and has not been answered yet, since nanocracks and their growth specify the conditions of fracture of solids [1][2][3][4][5][6][7]. A number of models of nanocrack formation were presented in [1,[8][9][10]: the Griffith model (Griffith examined the variation of energy of a body with a crack under load and derived an energy fracture criterion [1]); the Zener−Stroh−Petch, Cottrell, Bullough−Gilman, Orowan−Stroh, Coble, Nabarro−Herring models; etc.…”

mentioning

confidence: 99%

Investigation of primary nanocracks of atomically smooth metals

Yurov

Goncharenko

Oleshko

2023

Technical Physics Letters

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A new analytical model for calculating the characteristics of primary cracks that appear in atomically smooth metals is proposed. A technique has been developed for calculating the length of nanocracks in atomically smooth metals based on the study of the physical properties of crystals. For the first time, the parameters of primary cracks were calculated using the example of atomically smooth metals. The results obtained on the basis of the developed method are compared with the results of applying known models of nanocrack formation. It is shown that our results are consistent with previously known results. Keywords: surface, surface energy, surface layer, nanostructure, melting point, atomic volume, atomically smooth crystal.

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Deformation Features of the Propagation of Cleavage Cracks in a Ferritic-Pearlite Microstructure in the Ductile to Brittle Transition Interval

Cited by 5 publications

References 19 publications

The Cold-Brittleness Regularities of Low-Activation Ferritic-Martensitic Steel EK-181

The Cold-Brittleness Regularities of Low-Activation Ferritic-Martensitic Steel EK-181

The Role of Splitting Phenomenon under Fracture of Low-Carbon Microalloyed X80 Pipeline Steels during Multiple Charpy Impact Tests

Investigation of primary nanocracks of atomically smooth metals

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