Influence of the Direction of Propagation of the Main Crack on the Fracture Mechanism upon Impact Bending of Samples of High-Viscous Steel with a Filamentary Structure. Tensile Region

Morozova, A. N.; Schapov, G. V.; Хотинов, В. А.; Farber, V. M.; Selivanova, O. V.

doi:10.1134/s0031918x19070068

Cited by 2 publications

(3 citation statements)

References 3 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: 66%

“…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: 66%

Section: Discussionmentioning

confidence: 99%

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

Polekhina,

Osipova,

Litovchenko

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…Помимо этого на изломах присутствуют участки расщеплений (рис. 3, г; показано желтой стрелкой), которые повышают вязкость разрушения за счет увеличения площади поверхности при образовании трещин [14]. Таким образом, затрачиваемая на развитие трещины энергия оказывается выше, а доля хрупкой составляющей в изломе меньше (рис.…”

Section: результаты исследованийunclassified

Effect of accelerated cooling after cross-helical rolling on formation of structure and low-temperature fracture toughness of low-carbon steel

Gordienko,

Vlasov,

Pochivalov

2023

Izv. vysš. učebn. zaved., Čern. metall.

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The effect of accelerated cooling after cross-helical rolling of X70 low-carbon steel on the formation of structures and mechanical properties under static tension and impact bending was investigated. The use of interrupted accelerated cooling of steel after cross-helical rolling with exposure at 530 °C (mode I) and continuous accelerated cooling (mode II) leads to the formation of different types and ratios of structures in steel. After rolling according to mode I, the structure is characterized by the presence of ferrite, troostite, granular bainite, and fine Fe3C carbides. After rolling according to mode II, the structure is characterized by the formation of lath bainite and large sections of the martensitic-austenitic (MA) component up to 1 – 2 µm in size. It is shown that a decrease in the fineness of ferrite grains in steel after cross-helical rolling in modes I and II from 12 to 4.6 – 4.3 μm, the formation of a bainitic phase, and hardening of the matrix with carbides led to an increase in the yield strength of steel up to 440 and 490 MPa and tensile strength up to 760 and 880 MPa. Carrying out helical rolling according to mode I makes it possible to significantly increase the low-temperature fracture toughness of steel (KCV–70 °С = 160 J/cm2) compared to the hot-rolled state (KCV–70 °С = 11 J/cm2) and reduce the cold brittleness of steel to the temperatures below –50 °C. The use of continuous accelerated cooling (mode II) does not allow increasing the cold resistance of steel due to the formation of the lath bainite structure and large areas of the MA component.

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Influence of the Direction of Propagation of the Main Crack on the Fracture Mechanism upon Impact Bending of Samples of High-Viscous Steel with a Filamentary Structure. Tensile Region

Cited by 2 publications

References 3 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

Effect of accelerated cooling after cross-helical rolling on formation of structure and low-temperature fracture toughness of low-carbon steel

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