Inverse grain size effect on twinning in nanocrystalline TWIP steel

Mohammadzadeh, Roghayeh; Mohammadzadeh, Mina

doi:10.1016/j.msea.2018.11.085

Cited by 31 publications

(4 citation statements)

References 51 publications

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“…where m is the Taylor factor, γ is the SFE, b is the Burgers vector, K H−P tw is the Hall-Petch constant for twinning, and D is the grain size. According to this equation, fine grain size results in increased activation stress for mechanical twinning [45,47,48]. In the present study, the possible reason for the absence of deformation twins in the A700 specimen could be related to the small grain size, leading to the high critical resolved shear stress.…”

Section: Microstructure Characterization After Impact Testsmentioning

confidence: 61%

“…However, deformation twinning in this study was insignificantly near the middle of the crack extended within the A700 specimen at both RT and LNT (see Figure 8). Except for SFE, the twinning behavior is also strongly dependent on grain size [33,[43][44][45][46]. Rahman et al [43] indicated that twin initiation stress increased with the decrease in grain size in TWIP steel with grain size of 0.7-84 µm during cyclic tensile deformation.…”

Section: Microstructure Characterization After Impact Testsmentioning

confidence: 99%

“…The deformation twins in the fine-grained specimen were much thinner than those in the coarse-grained specimen. Additionally, an increase in the nucleation stress of deformation twinning with the decrease in grain size from 31 nm to 11.1 nm was observed using molecular dynamics (MD) simulations [45]. The twinning stress is generally described by the following equation [43,44]:…”

Section: Microstructure Characterization After Impact Testsmentioning

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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Section: Microstructure Characterization After Impact Testsmentioning

confidence: 61%

Section: Microstructure Characterization After Impact Testsmentioning

confidence: 99%

Section: Microstructure Characterization After Impact Testsmentioning

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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“…Including the strength level, diverse tensile deformation characteristics of the TWIP steel are influenced by the grain refinement, and it affects the strain hardening behavior (Dini et al, 2010;Gutierrez-Urrutia et al, 2010;Dini and Ueji, 2012;Gutierrez-Urrutia and Raabe, 2012). First, deformation twinning is reduced during the tensile deformation of the fine-grained TWIP steel (Ueji et al, 2008;Kang et al, 2016;Mohammadzadeh and Mohammadzadeh, 2019;Hwang, 2020). Reversely, its dislocation accumulation kinetics is accelerated (Jeong et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effect of Discontinuous Yielding on the Strain Hardening Behavior of Fine-Grained Twinning-Induced Plasticity Steel

2021

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The yielding of a high Mn twinning-induced plasticity steel was examined in three fine-grained specimens recrystallized at 700°C for 5 min with different cooling conditions. While the stress-strain curves of furnace-cooled and air-cooled specimens exhibit a stress drop at yielding, the drop was not observed in the water-quenched specimen. A simple analysis of the displacement data indicates the occurrence of localized deformation at the beginning of the plastic deformation in the three tensile specimens with different cooling conditions. The localized deformation of all three specimens was confirmed as Lüders strain by digital image correlation (DIC) analysis. Based on this observation, the role of yielding behavior on the strain hardening rate evolution at an early stage of the tensile deformation was discussed.

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