Simultaneously enhancing strength-ductility synergy and strain hardenability via Si-alloying in medium-Al FeMnAlC lightweight steels

Zhi, Huihui; Li, Jinshan; Li, Wanmin; Elkot, Mohamed; Antonov, Stoichko; Zhang, Heng; Lai, Ming-Yang

doi:10.1016/j.actamat.2022.118611

Cited by 23 publications

(9 citation statements)

References 85 publications

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“…As shown in Figure 5b, dislocation slip is dominated by planar slip in austenite and forms an array of {111} planar dislocations known as high-density dislocation walls (Figure 4b). There exist dislocation tangles occurring between HDDWs, which are also expected to result in dynamic recovery [31]. At this strain level, deformation twins were activated on {111} slip systems.…”

Section: Microstructural Evolution Upon Dynamic Compressionmentioning

confidence: 98%

“…Crystals 2024, 14, x FOR PEER REVIEW 6 of 12 [31]. At this strain level, deformation twins were activated on {111} slip systems.…”

Section: Microstructural Evolution Upon Dynamic Compressionmentioning

confidence: 99%

“…As can be seen from Figure 4a, wave slip-dominated ferrite deformation and frequent crossslip lead to high dislocation multiplication rates through the formation of new Frank-Read sources [38], leading to high work hardening. In addition, a large number of cross-slip dislocations are entangled with each other to form the dense dislocated wall (DDW) [31]. These dislocation structures largely impede the movement of the dislocations, allowing the material to increase in strength and produce strain hardening.…”

Section: Strain-hardening and -Softening Behaviormentioning

confidence: 99%

“…Similarly, the MBs formed at a strain rate of 3144 s −1 act as barriers for dislocation motion and lead to significant strain hardening. In addition, both HDDWs and MBs contribute to grain refinement, leading to the dynamic Hall-Petch effect [31]. Therefore, the emergence of HDDWs and MBs is the key to conferring work hardening on current lightweight steel.…”

Section: Strain-hardening and -Softening Behaviormentioning

confidence: 99%

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Dynamic Compression and Constitutive Model in Fe-27Mn-10Al-1C Duplex Lightweight Steel

Cao,

Li,

Bai

et al. 2024

Crystals

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Fe-Mn-Al-C lightweight steels have been of significant interest due to their excellent mechanical properties and unique microstructures. However, there has been limited focus on the dynamic deformation. Here, we systematically investigate the mechanical responses over various strain rates and corresponding microstructure evolution in quasi-static and dynamic compression to reveal the transition of deformation mechanisms. The present lightweight steel exhibits a significant strain rate effect, with the yield strength increasing from 735.8 to 1149.5 MPa when the strain rate increases from 10−3 to 3144 s−1. The deformation in ferrite under high-strain-rate loading is dominated by wave slip, forming a cellular structure (cell block). Meanwhile, the deformation in austenite is dominated by planar slip, forming dislocation substructures such as high-density dislocation walls and microbands. In addition, the deformation twinning (including secondary twinning)- and microband-induced plasticity effects are responsible for the excellent dynamic compression properties. This alloy delays damage location while maintaining high strength, making it ideal for shock loading and high-strain-rate applications. The Johnson–Cook (J-C) constitutive model is used to predict the deformation behavior of lightweight steel under dynamic conditions, and the J-C model agrees well with the experimental results.

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Section: Microstructural Evolution Upon Dynamic Compressionmentioning

confidence: 98%

“…Crystals 2024, 14, x FOR PEER REVIEW 6 of 12 [31]. At this strain level, deformation twins were activated on {111} slip systems.…”

Section: Microstructural Evolution Upon Dynamic Compressionmentioning

confidence: 99%

Section: Strain-hardening and -Softening Behaviormentioning

confidence: 99%

Section: Strain-hardening and -Softening Behaviormentioning

confidence: 99%

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Dynamic Compression and Constitutive Model in Fe-27Mn-10Al-1C Duplex Lightweight Steel

Cao,

Li,

Bai

et al. 2024

Crystals

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“…The Ti plays an important role in the mechanical properties of manganese steels, especially in the improvement of yield strength of manganese steels. However, excessive Ti element can lead to a significant decrease in ductility, which leads to a decline in the total energy of tensile [ 15 ]. Hence, studies focus on searching for the appropriate titanium content to achieve an improvement in the strength and ductility of high-Mn steels [ 4 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Multi-Phase Grains Improving the Strength-Ductility Balance in Warm-Rolled Fe-18Mn-3Ti Steel

Li,

Liu,

Xia

et al. 2024

Materials

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The thermal properties, microstructure, and mechanical properties of Fe-18Mn-3Ti (wt%) were investigated, focusing on the effects of different heat-treatment processes. Results revealed that the 450 °C warm-rolling sample (450 WR) exhibited promising mechanical properties. Specifically, this sample displayed a yield strength of 988 MPa, an ultimate tensile strength of 1052 MPa, and total elongation of 15.49%. Consequently, a favorable strength-ductility balance was achieved. The strain-hardening ability surpassed that of the cold rolling sample (CR). Microstructure analysis indicated the simultaneous occurrence of dynamic equilibrium between grain deformation and re-crystallization because of the co-influence of thermal and strain in the warm rolling process. This desirable mechanical property was attributed to the presence of a multi-phase (α-martensite, austenite, and ε-martensite) and heterogeneous microstructure. The improvement of ultimate tensile strength was based on grain refinement, grain co-deformation, and the transformation-induced plasticity (TRIP) effect in the early stage of plastic deformation (stage Ⅰ). The improvement of ultimate elongation (TEL) was ascribed to the TRIP effect in the middle stage of plastic deformation (stage Ⅱ).

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Improving heat resistance of Al–Cu–Li alloy with the addition of Sc and Si

Xue,

Li,

Wang

et al. 2023

Sci. China Mater.

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Simultaneously enhancing strength-ductility synergy and strain hardenability via Si-alloying in medium-Al FeMnAlC lightweight steels

Cited by 23 publications

References 85 publications

Dynamic Compression and Constitutive Model in Fe-27Mn-10Al-1C Duplex Lightweight Steel

Dynamic Compression and Constitutive Model in Fe-27Mn-10Al-1C Duplex Lightweight Steel

Heterogeneous Multi-Phase Grains Improving the Strength-Ductility Balance in Warm-Rolled Fe-18Mn-3Ti Steel

Improving heat resistance of Al–Cu–Li alloy with the addition of Sc and Si

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