Influence of DIMT on impact toughness: Relationship between crack propagation and the α′-martensite morphology in austenitic steel

Huang, Minghao; Wang, Chenchong; Wang, Lingyu; Wang, Jinliang; Mogucheva, Anna; Xu, Wei

doi:10.1016/j.msea.2022.143191

Cited by 15 publications

(5 citation statements)

References 62 publications

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“…In comparison to 8 Mn, 5 Mn had more ε-martensite to α′-martensite due to the difference in austenite stability. Different from the strain-induced martensite of isolated fine blocks, the α′-martensite has a large and continuous martensite block, which is beneficial to crack propagation and leads to premature fracture, thus limiting the tensile ductility [ 14 , 16 ]. If there is transformed martensite in the propagation direction, the microcrack will continue to expand perpendicular to the tensile direction.…”

Section: Resultsmentioning

confidence: 99%

“…This is mainly because the addition of Mn improves the thermal stability of lamellar cementite. Huang et al [ 14 ] studied the relationship between the morphology of martensite formed by the DIMT effect and the mode of crack propagation on impact toughness in austenitic steels. It is proved that the crack propagation is closely related to martensite.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Mn Content on the Toughness and Plasticity of Hot-Rolled High-Carbon Medium Manganese Steel

et al. 2023

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The tensile and impact deformation behavior of three different Mn content test steels, xMn-1.0C-0.25V-1.5Cr-0.3Mo (5, 8 and 13 wt%), were investigated using mechanical properties testing, SEM-EBSD and TEM. The elongation and −20 °C impact energy of the three types of Mn content test steels increased as the Mn content increased. The room temperature tensile elongation was 9%, 23% and 81%, and the −20 °C impact energy was 9 J, 99 J and 241 J, respectively. The fracture morphologies of 5 Mn and 8 Mn were found to be cleavage fractures with secondary cracks and micro-voids. The 13 Mn fracture morphology was a plastic fracture with many coarse dimples. Transverse cracks perpendicular to the tensile direction occurred on the surface of the gauge area of 5 Mn and 8 Mn tensile specimens, reducing plasticity dramatically. This was mainly related to the martensitic transformation produced by stress. We characterized the martensite near the tensile fracture and speculated the main mode of crack propagation. Furthermore, a little amount of sharp-shaped BCC phase was found in the 5 Mn, which was determined to be a hard phase relative to the austenite matrix by nanoindentation test. These steels have stacking fault energies ranging from ~15 to ~29 mJ/m2 with increasing Mn content 13 Mn has high stacking fault energy (SFE) and austenite stability. Twin-induced plasticity (TWIP) was the deformation mechanism.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Mn Content on the Toughness and Plasticity of Hot-Rolled High-Carbon Medium Manganese Steel

et al. 2023

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“…Comparing the microstructures produced with the two processes shown in Figure 7a,b, the microstructure of the tested steel under the fully austenitized process was significantly rougher. The coarsening of the microstructure manifested not only as an increase in the size of the original austenite grains but also as the presence of certain coarsening in the multilayer substructure within the austenite grains, including the packet and block of the bainite [36,37]. The block of bainite is usually considered the smallest unit for regulating the toughness of tested steel, which is related to the characteristics and density of the block interface.…”

Section: The Influence Of Interface Density On Toughnessmentioning

confidence: 99%

Carbon Atom Distribution and Impact Toughness of High-Carbon Bainitic Steel

Long,

Dai,

Wang

et al. 2024

Coatings

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High-carbon nano bainitic steel is currently a hot research topic. The effect of the matrix’s carbon content and carbon atom distribution on the toughness of high-silicon, high-carbon bainitic steel is studied. The microstructure under an incomplete austenitization process consists of undissolved carbides, bainitic ferrite, and retained austenite. Using this process, the carbon content in bainitic ferrite is relatively low. Under the complete austenitization process, the carbon content in the bainite ferrite in the sample is high, and there is more retained austenite in the blocky type. The sample exhibits high impact toughness under an incomplete austenitization process, which is mainly affected by the low carbon content of bainite ferrite, high coordination ability of retained austenite, and high interface density of microstructure. The EBSD results show that the crack easily propagates between parallel bainite laths with low interface density compared with the high interface density perpendicular to the laths.

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“…The impact toughness is assessed by the absorbed energy per unit area of the fracture surface, which is usually composed of the energy consumed during crack initiation and propagation stages. [34,35] Accordingly, the essence of impact toughness should represent the resistance to crack initiation and propagation. In this work, we performed an instrumented impact test to study the impact properties of the two steels.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Development of Air‐Cooled Carbide‐Free Bainite/Martensite Multiphase Steel: Transformation Kinetics, Microstructure, and Mechanical Properties

Cheng,

Gao,

Liu

et al. 2023

steel research int.

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An air‐cooled low‐carbon Mn–Si–Cr alloyed steel with multiphase microstructure of carbide‐free bainite/martensite (CFB/M) is developed. The kinetics of bainitic transformation during air‐cooling process is discussed via considering the transformation latent heat with help of the measured temperature‐cooling curves. Results show that the CFB formed during air cooling can effectively refine the multiphase microstructure and stabilize the film‐like retained austenite that contributes to transformation‐induced plasticity effect upon deformation. An optimum combination of strength, ductility, and toughness of the air‐cooled bainitic steel is achieved (tensile strength: 1418 MPa, total elongation: 15.8%, and Charpy V‐notch impact energy: ≈71 J). The newly developed Mn–Si–Cr alloyed air‐cooled bainitic steel exhibits superior mechanical properties to the commercial 23CrNi3Mo steel but has a much lower alloy cost.

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Influence of DIMT on impact toughness: Relationship between crack propagation and the α′-martensite morphology in austenitic steel

Cited by 15 publications

References 62 publications

Effect of Mn Content on the Toughness and Plasticity of Hot-Rolled High-Carbon Medium Manganese Steel

Effect of Mn Content on the Toughness and Plasticity of Hot-Rolled High-Carbon Medium Manganese Steel

Carbon Atom Distribution and Impact Toughness of High-Carbon Bainitic Steel

Development of Air‐Cooled Carbide‐Free Bainite/Martensite Multiphase Steel: Transformation Kinetics, Microstructure, and Mechanical Properties

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