Unusual relationship between impact toughness and grain size in a high-manganese steel

Xie, Pan; Shen, Shucheng; Wu, C.L.; Li, Jiehua; Chen, Jianghua

doi:10.1016/j.jmst.2021.01.089

Cited by 33 publications

(12 citation statements)

References 47 publications

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“…Operating deformation mechanisms lead to the formation of preferred crystallographic orientations and hence the texture development within all the phases involved [24,38,39]. Therefore, the occurrence of crystallographic relationships between the parent austenite and newly formed martensitic phases is usually observed [27,29,31,[40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Complex Structural Effects in Deformed High-Manganese Steel

2021

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The research presented in this paper is part of a larger project concerning deformation behavior, microstructure and mechanical properties of high-manganese steels with different chemical compositions and processed under various conditions. The current investigation deals with the development of microstructure and crystallographic texture of Fe-21.2Mn-2.73Al-2.99Si steel deformed in tension until fracture at ambient temperature. The deformation process of the examined steel turned out to be complex and included not only dislocation slip and twinning but also strain induced phase transformations (γ → ε) and (γ → α′). The formation of ε-martensite with hexagonal structure was observed within the microstructure of the steel starting from the range of lower strains. With increasing deformation degree, the α′-martensite showing a cubic structure gradually began to form. Attempts have been made to explain the circumstances or conditions for the occurrence of the deformation mechanisms mentioned above and their impact on the mechanical properties. The obtained results indicate that the strength and plastic properties of the steel substantially exceed those of plain carbon steels. Since both, mechanical twinning and the strain-induced phase transformations took place during deformation, it seems that both types of deformation mechanisms contributed to an increase in the mechanical properties of the examined manganese steel.

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Section: Introductionmentioning

confidence: 99%

Complex Structural Effects in Deformed High-Manganese Steel

2021

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“…At the same time, twin boundaries with high interfacial strength retarded both crack nucleation and propagation, promoting homogeneous plastic deformation at the crack tip region [17]. Furthermore, the formation of deformation twins also dissipated a part of the mechanical energy [18]. Therefore, the stress concentration was effectively relieved, and the crack tip became blunt in the A1000 specimen, resulting in higher impact energy at RT and LNT.…”

Section: Effect Of Initial Microstructure On Charpy Impact Energymentioning

confidence: 99%

“…Besides the SFE, the initial microstructure exerts critical effects on the deformation mechanism and mechanical properties of high-manganese steel [4,[17][18][19][20]. Grain size plays an important role in the activation of deformation twinning and martensitic transformation [21].…”

Section: Introductionmentioning

confidence: 99%

“…The high density of deformation twinning boundaries can provide capacious room for gathering dislocations and result in a stronger dynamic grain refinement effect, thereby improving the toughness and ductility of steel [22]. Moreover, Xie et al [18] indicated that the improvement in the cryogenic impact toughness of Fe-25Mn-3Al-3Si steel was attributed to the TWIP and TRIP effects with the grain size increase from 2.7 to 47.8 µm. Additionally, the formation of deformation twins and martensitic phase was inhibited by grain refinement.…”

Section: Introductionmentioning

confidence: 99%

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Dependence of Charpy Impact Properties of Fe-30Mn-0.05C Steel on Microstructure

Xiong

Kong

et al. 2023

Crystals

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Fe-30Mn-0.05C steel specimens with cold-rolled, partially recrystallized, fine-grained, and coarse-grained microstructures were fabricated by means of 80% cold rolling followed by annealing at 550–1000 °C. The initial and deformed microstructures were characterized, and the Charpy impact properties were tested at room temperature (RT) and liquid nitrogen temperature (LNT). It was found that the Charpy absorbed energy increased with the annealing temperature, while the specimens showed different trends: parabolic increase at RT and exponential increase at LNT, respectively. Compared with the fully recrystallized specimens, those with a partially recrystallized microstructure exhibited lower impact energy, especially at LNT. This was because cracks tended to nucleate and propagate along the recovery microstructure where stress concentration existed. The grain size played an important role in the twinning behavior and impact properties. High Charpy impact energy (~320 J) was obtained in the coarse-grained specimen having the grain size of 42.1 μm at both RT and LNT, which was attributed to the activation of high-density deformation twinning. However, deformation twinning was inhibited in the specimen with the average grain size of 3.1 μm, resulting in limited work hardening and lower impact energy.

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“…With the exception of SFE, the activation of deformation twinning and martensitic transformation is highly influenced by the grain size [45][46][47]. A decrease in grain size leads to an increase in the critical stress required for deformation twinning and martensitic transformation during plastic deformation [24,48,49]. Rahman et al [49] conducted a study on Fe-15Mn-2Al-2Si-0.7C steel, with grain sizes ranging from 0.7 to 48 µm, and found that the critical twinning stress increased as the grain size decreased.…”

Section: Grain Size Effectmentioning

confidence: 99%

Research Progress on Ultra-Low Temperature Steels: A Review on Their Composition, Microstructure, and Mechanical Properties

Xiong,

Zhang,

Wang

2023

Metals

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To address global environmental concerns and reduce carbon dioxide emissions, countries worldwide are prioritizing the development of green, eco-friendly, and low-carbon energy sources. This emphasis has led to the growing importance of promoting clean energy industries like hydrogen energy and natural gas. These gases are typically stored and transported at cryogenic temperatures, making ultra-low temperature alloys indispensable as essential materials for the storage and transportation of liquid gas energy. With the temperature decreasing from room temperature (RT) to liquid nitrogen temperature (LNT), the dominant deformation mechanism in high-manganese steels undergoes a transformation from dislocation slip to deformation twinning, resulting in exceptional cryogenic mechanical properties. Consequently, high-manganese steel has emerged as an excellent material candidate for cryogenic applications. This report focuses on establishing the composition of high-manganese steel suitable for cryogenic applications and provides a comprehensive review of its microstructure and mechanical properties at both RT and LNT. Furthermore, it offers a prospective outlook on the future development of cryogenic high-manganese steels.

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Unusual relationship between impact toughness and grain size in a high-manganese steel

Cited by 33 publications

References 47 publications

Complex Structural Effects in Deformed High-Manganese Steel

Complex Structural Effects in Deformed High-Manganese Steel

Dependence of Charpy Impact Properties of Fe-30Mn-0.05C Steel on Microstructure

Research Progress on Ultra-Low Temperature Steels: A Review on Their Composition, Microstructure, and Mechanical Properties

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