Separations in steels subjected to controlled rolling, followed by accelerated cooling

Farber, V. M.; Хотинов, В. А.; Беликов, С.; Selivanova, O. V.; Lezhnin, N. V.; Morozova, A. N.; Karabonalov, M. S.; Zhilyakov, A. Yu.

doi:10.1134/s0031918x16040050

Cited by 16 publications

(5 citation statements)

References 16 publications

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“…It is evidenced by the change (increase) in the steel microhardness near the sides of the main crack, compared to the initial undeformed state. However, as noted by the authors of [41][42][43], the width of the plastically deformed region significantly decreases with the decreasing temperature.…”

Section: Discussionmentioning

confidence: 64%

“…In the works [41][42][43][44], the influence of impact test temperature both on the microhardness distribution along the main crack propagation path and the width of the plastic deformation region of the steel with a ferritic-martensitic microstructure was studied in detail. It has been shown [41][42][43] that the plastic zone is formed not only in the upper and central part of the temperature curve of the impact strength, but also on the lower shelf. It is evidenced by the change (increase) in the steel microhardness near the sides of the main crack, compared to the initial undeformed state.…”

Section: Discussionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 64%

Section: Discussionmentioning

confidence: 99%

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

Polekhina,

Osipova,

Litovchenko

et al. 2023

Metals

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“…Pipeline plates exhibit anisotropy of their mechanical properties due to their specific structural and textural states [5,[21][22][23][24]. Texture can affect steel strength and crack resistance in different ways, depending on the direction.…”

Section: Introductionmentioning

confidence: 99%

“…This splitting can be described as brittle cracks perpendicular to the main surface of the ductile fracture. They form in the vicinity of a propagating crack tip as a result of a triaxial stress state and due to the fact that under certain conditions a material can be ductile in one direction and brittle in another, thus exhibiting anisotropy of brittleness [23,24]. In [29], it was demonstrated that splitting does not have a significant influence on main crack propagation, i.e., they do not directly affect material fracture itself.…”

Section: Introductionmentioning

confidence: 99%

Tensile Deformation and Fracture Behavior of API-5L X70 Line Pipe Steel

Лобанов

Хотинов

Urtsev³

et al. 2022

Materials

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Thermo-mechanical controlled processing (TMCP) is employed to obtain the required level of mechanical properties of contemporary HSLA steel plates utilized for gas and oil pipeline production. The strength and crack resistance of pipeline steels are mainly determined by its microstructure and crystallographic texture. In this study, the influence of the structural and textural states of industrially produced API-5L X70-X80 pipeline steels on tensile mechanical properties was analyzed. TMCP routes with different hot rolling temperatures and cooling rates were employed. The texture of steel was assessed using the Taylor factor, which was calculated based on electron backscatter diffraction (EBSD). The decrease in rolling temperature resulted in the sharper texture characterized by {001} planes banding (cleavage planes in the bcc lattice) parallel to rolling direction. The tensile deformation behavior at the stage of necking was determined by the crystallographic and morphological texture of the material and demonstrated significant anisotropy. Rupture of all investigated samples was accompanied by the development of splitting on the fracture surface. The splitting was localized in the rolling plane similar to the splitting in standard Charpy tests of pipeline steels.

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“…A intensidade das "separações" presentes na superfície fraturada dos corpos de prova do ensaio Charpy precisou ser caracterizada quantitativamente para permitir o estabelecimento de correlações com as variáveis do processo e condições de teste. Farber (2016) propôs um método trabalhoso envolvendo a medição das áreas afetadas por "separações" na superfície fraturada do corpo de prova de Charpy. No entanto, uma abordagem mais simples, proposta por Fernandes (2010), requer apenas a medição dos comprimentos das separações, uma vez que a relação comprimento/largura é praticamente constante.…”

Section: Introductionunclassified

Efeito Da Temperatura De Acabamento Na Formação De Separações Em Corpos De Prova De Impacto Charpy De Chapas Grossas Da Classe 80 Ksi Produzidas Por TMCP

Júnior¹,

Gorni²,

Silveira³

et al. 2018

ABM Proceedings

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Resumo Este artigo descreve o primeiro teste de fabricação de chapas grossas da classe de 80 ksi produzidas por laminação controlada no novo Laminador de Chapas Grossas da Gerdau Ouro Branco. Este teste foi muito bem-sucedido, uma vez que o produto satisfez plenamente as exigências de propriedades mecânicas para tal grau, permitindo o início da entrega comercial deste material. Além disso, a experiência adquirida neste processo promoverá o aprimoramento tecnológico desta classe de produtos, além de chapas mais sofisticadas. A ocorrência de separações (separations) na superfície fraturada dos corpos de prova do ensaio de Impacto Charpy foi detalhadamente analisada. Palavras-chave: Classe 80 ksi; Laminação Controlada; Separações; Ensaio Charpy.

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Separations in steels subjected to controlled rolling, followed by accelerated cooling

Cited by 16 publications

References 16 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

Tensile Deformation and Fracture Behavior of API-5L X70 Line Pipe Steel

Efeito Da Temperatura De Acabamento Na Formação De Separações Em Corpos De Prova De Impacto Charpy De Chapas Grossas Da Classe 80 Ksi Produzidas Por TMCP

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