Combining crystal plasticity and electron microscopy to elucidate texture dependent micro-mechanisms of tensile deformation in lath martensitic steel

Chatterjee, A. K.; Sk, Md. Basiruddin; Ghosh, Abhijit; Mitra, Rahul; Chakrabarti, Debalay

doi:10.1016/j.ijplas.2022.103251

Cited by 9 publications

(3 citation statements)

References 99 publications

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“…Due to the high stacking fault energy (SFE), the splitting of dislocations in BCC steels is difficult. Together with a large number of slip systems, this contributes to the easy transverse gliding of screw dislocations and the formation of various kinds of dislocation pileups and dislocation cellular or fragmented structures [35,36,40]. The formation of such microstructures was found in this work at temperatures in the vicinity of and above DBTT.…”

Section: Discussionmentioning

confidence: 65%

“…At the same time, the discontinuities, in accordance with the results of fractographic studies of EK-181 steel, can form both at the particle-matrix boundary and during the particle destruction. An interesting fact was observed in [40] that one of the reasons for the destruction of M 23 C 6 particles is the formation of deformation twins inside them during plastic deformation of the sample.…”

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: 65%

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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“…However, when grains are refined to the submicrometer or nanometer scale, plastic deformation is mainly attributed to grain boundary sliding and the grain boundary sliding mechanism becomes the dominant mechanism [17]. For lath martensite, lath units are virtually single crystals with thicknesses of approximately hundreds of nanometers [18]. From a specific viewpoint, the multilevel lath martensitic could be considered an ultrafine grain microstructure.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Influence of Microstructure on Tensile Properties and Fatigue Crack Propagation Behavior for Lath Martensitic Steel

Deng,

Liang,

Zhao

et al. 2023

Crystals

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This paper addresses the role of multilevel microstructures on the fatigue crack propagation behavior and the tensile properties of lath martensite with different substructure sizes. Microstructure characterization of the alloy was carried out by transmission electron microscopy (TEM), scanning electron microscopy (SEM), electron back-scattering diffraction (EBSD), and optical microscopy (OM). Based on the classic Hall–Petch relationship, the results of tensile tests showed that martensitic block is the effective control unit of yield strength. Furthermore, the plasticity of lath martensite is not sensitive to grain size. The tensile deformation mechanisms were also discussed. Fatigue crack propagation tests revealed that the coarse grain has a higher crack propagation threshold and lower crack propagation rate than the fine grain in lath martensitic steel. The change in the plasticity zone ahead of the crack tip leads to the transitional behavior of the fatigue crack propagation rate. When plasticity zone sizes are equal to the block size, the fatigue crack propagation reverts to a stable propagation stage. Finally, an empirical model was established to predict the fatigue crack propagation rate of the stable propagation stage based on the tensile properties of the lath martensitic steel.

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Unveiling the Correlation among Microstructure, Texture, Slip System Activity, and Tensile Property in a Hot Rolled Ni Containing Medium‐Mn Steel

Kumar,

Ghosh,

Rakshit

et al. 2024

steel research int.

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The microstructure–texture–tensile property relationships in a Ni‐containing medium‐Mn steel (Ni‐MMS), subjected to limited thermomechanical processing steps (i.e., hot forging and hot rolling), have been established in this study. The microstructure of the specimens hot rolled (HR) at 1173 (HR‐1173K) and 1373 K (HR‐1373K) exhibits ferrite and austenite phases. The austenite phase fraction in the HR‐1173K specimen is found to be higher than the HR‐1373K condition. The volume fraction of austenite to martensite transformation during tensile testing is also observed to be higher in the HR‐1173K specimen (≈13%) than the HR‐1373K condition (≈2%). This suggests the occurrence of more efficient transformation‐induced plasticity effect in the HR‐1173K specimen in comparison to the HR‐1373K condition, resulting in improved strength–ductility synergy in the former specimen. The smaller grain size of both the phases and higher fraction of twin boundaries as well the evolution of higher intensity γ‐fiber <111>//ND in the HR‐1173K specimen leads to better tensile properties. In addition, the overall activation of the primary slip systems (combination of face‐centered cubic and body‐centered cubic phases slip system), estimated through visco‐plastic self‐consistent simulation, is higher in HR‐1173K specimens, resulting in improved strain hardening response as compared to HR‐1373K one.

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Combining crystal plasticity and electron microscopy to elucidate texture dependent micro-mechanisms of tensile deformation in lath martensitic steel

Cited by 9 publications

References 99 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

Influence of Microstructure on Tensile Properties and Fatigue Crack Propagation Behavior for Lath Martensitic Steel

Unveiling the Correlation among Microstructure, Texture, Slip System Activity, and Tensile Property in a Hot Rolled Ni Containing Medium‐Mn Steel

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