Mechanism of twinning induced plasticity in austenitic lightweight steel driven by compositional complexity

Lai, Zen-Hao; Sun, Yi-Hsuan; Lin, Yi‐Ting; Tu, Jui-Fan; Yen, Hung‐Wei

doi:10.1016/j.actamat.2021.116814

Cited by 54 publications

(14 citation statements)

References 76 publications

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“…2), allows activating the previously inaccessible deformation-induced nanotwinning mechanism in the austenite matrix. The formation of nanotwins in turn enables further strain hardening and toughening reserves during the later stages of deformation, which counteract softening and strain localization, as seen in some HEAs 19,30,31 and lightweight steels 32,33 . The fact that this alloy design strategy is successful, conveys an important and general lesson: materials with high SFEs can be re-modelled for the activation of mechanical twinning and its exploitation for strengthening, provided the required high strength levels can be achieved by other strain hardening mechanisms.…”

Section: Discussionmentioning

confidence: 99%

High stress twinning in a compositionally complex steel of very high stacking fault energy

Wang

et al. 2022

Nat Commun

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Deformation twinning is rarely found in bulk face-centered cubic (FCC) alloys with very high stacking fault energy (SFE) under standard loading conditions. Here, based on results from bulk quasi-static tensile experiments, we report deformation twinning in a micrometer grain-sized compositionally complex steel (CCS) with a very high SFE of ~79 mJ/m2, far above the SFE regime for twinning (<~50 mJ/m2) reported for FCC steels. The dual-nanoprecipitation, enabled by the compositional degrees of freedom, contributes to an ultrahigh true tensile stress up to 1.9 GPa in our CCS. The strengthening effect enhances the flow stress to reach the high critical value for the onset of mechanical twinning. The formation of nanotwins in turn enables further strain hardening and toughening mechanisms that enhance the mechanical performance. The high stress twinning effect introduces a so far untapped strengthening and toughening mechanism, for enabling the design of high SFEs alloys with improved mechanical properties.

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Section: Discussionmentioning

confidence: 99%

High stress twinning in a compositionally complex steel of very high stacking fault energy

Wang

et al. 2022

Nat Commun

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“…The precipitates distributed TWIP steels and TWIP steels with β-Mn phase. [29,32,36,[40][41][42][43][44][45][46][47] www.advancedsciencenews.com along with the grain boundary and did not grow into the grain interior. When warm-rolling was performed at the temperature value of 650 °C, the number of precipitates at grain boundaries and twins inside the grain decreased, as shown in Figure 5h (enlarged view of the selected area in Figure 5g).…”

Section: Microstructurementioning

confidence: 99%

Production of Ultrahigh‐Strength and High‐Ductility TWIP Steel by Precipitation of β‐Mn during Large Deformation during Warm‐Rolling

Cao

Chen

Xie

et al. 2023

steel research int.

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Herein, twinning‐induced plasticity (TWIP) steel having large deformation is rolled at different rolling temperatures to improve the tensile strength and retain a certain plastic deformation capacity. Based on X‐ray diffraction and transmission electron microscope analysis, β‐Mn is found as the precipitate at the grain boundary during the warm‐rolling process (500–650 °C). To investigate the impact of β‐Mn on the tensile properties, the microstructure of the TWIP steel rolled at the temperature value of 600 °C is observed by carrying out electron backscatter diffraction and scanning electron microscope measurements. The intergranular β‐Mn phase can help the material to accumulate geometric necessary dislocation (GND) density, inhibit crack propagation, as well as improve the strength and plasticity of the material. Once TWIP steel is warm‐rolled above the temperature value of 600 °C, and serrated flow appears in the tensile process, which is also conducive to improving the material properties.

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“…Two feasible strategies have been used to address these mutually exclusive problems. The most common is to suppress the DIMT process, thereby ensuring an ideal toughness and then achieving additional strengthening by back stress hardening [32], and twinning-induced plasticity (TWIP) [33]. However, limiting DIMT usually needs a high weight percent of an alloying element (Ni, Mn, etc.…”

Section: Introductionmentioning

confidence: 99%

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

Huang

Wang

et al. 2022

Materials Science and Engineering: A

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Mechanism of twinning induced plasticity in austenitic lightweight steel driven by compositional complexity

Cited by 54 publications

References 76 publications

High stress twinning in a compositionally complex steel of very high stacking fault energy

High stress twinning in a compositionally complex steel of very high stacking fault energy

Production of Ultrahigh‐Strength and High‐Ductility TWIP Steel by Precipitation of β‐Mn during Large Deformation during Warm‐Rolling

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

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