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

Wang, Zhangwei; Lu, Wenjun; An, Fengchao; Song, Min; Ponge, Dirk; Raabe, Dierk; Li, Zhi Ming

doi:10.1038/s41467-022-31315-2

Cited by 72 publications

(9 citation statements)

References 41 publications

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“…These hierarchical A2 phases dramatically strengthen the friction interface through dislocation bypassing, resulting in high strain hardening, which, in turn, interrupts the local strain softening and damage initiation caused by the shearable matrix phase [ 5 , 50 ]. At higher sliding-induced deformations, high stress level, which arises from the complex interactions between dislocations and nanoprecipitates, is capable of activating DTs even in the A1 phase with high SFE [ 60 ]. The ensuing formation of nano-DTs allows for the continuous accumulation of dislocations as sustainable sources of high-density dislocation storage, further hardening and toughening the worn subsurface layer [ 10 , 56 ].…”

Section: Resultsmentioning

confidence: 99%

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

et al. 2023

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Sustained wear damages on the sliding surfaces of alloys are generally the culprit responsible for the failure of various mechanical systems. Inspired by high-entropy effects, here we deliberately deploy nanohierarchical architecture with composition undulation in a Ni 50 (AlNbTiV) 50 complex concentrated alloy, which yields ultralow wear rate within the order of 10 −7 to 10 −6 mm 3 /Nm between room temperature and 800 °C. Such remarkable wear resistance heretofore represents one of the highest wear resistance reported for the bulk alloys or composites, and originates from the multi-type adaptive friction interface protection governed by intrinsically nano-coupled grains and nanoprecipitates. This cooperative heterostructure releases gradient frictional stress in stages upon wear at room temperature through the coexistence of multiple deformation pathways while activating a dense nanocrystalline glaze layer upon wear at 800 °C to minimize adhesive and oxidative wear. Our work uncovers a practical avenue for tailoring wear properties with multicomponent heterostructures over a wide temperature range.

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Section: Resultsmentioning

confidence: 99%

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

et al. 2023

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“…The spatial resolution at 200 kV was exploited (typical TEM-STEM accelerating voltages are 60-300 kV, in contrast to the few to tens of kV used in SEM-STEM) to perform a detailed study of the samples. Samples under low-angle annular dark field (LAADF) conditions were characterised, highly sensitive to lattice strain and defects [35,36], thus allowing the identification of crystal domains (i.e., grain boundaries), including nanometric crystal grains. Figure 10 shows LAADF images of 0A and 1C specimens before and after the drawing test, in an area free of residual martensite.…”

Section: Microstructure Analysis Of Bcc After Drawing Testmentioning

confidence: 99%

A Combined Microscopy Study of the Microstructural Evolution of Ferritic Stainless Steel upon Deep Drawing: The Role of Alloy Composition

Núñez,

Collado,

De la Mata

et al. 2024

JMMP

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Ferritic stainless steel (FSS) is widely used to manufacture deep-drawn products for corrosion resistance applications, being the alloy drawability strongly affected by its microstructural anisotropy. This study combines a variety of microscopy techniques enabling in-depth analyses of the microstructural evolution of two different FSSs correlated to their deep drawing performance. One of the steels has a good correspondence with the standard EN-1.4016 (AISI 430). The other is a modified version of the previous one with higher contents of the ferrite-stabilising elements Si and Cr, and lower contents of the austenite-stabilising elements C, N, and Mn. Electron Backscatter Diffraction results confirm that the microstructural properties and drawability of FSS in the deep drawing process are improved in the modified steel version. Scanning transmission electron microscopy under low-angle annular dark field conditions evidences that the deformation mechanism of FSS during deep drawing follows a microstructural distortion model based on the grain size gradient and shows a variation of the deformation texture depending on the alloy composition. This work demonstrates the potential of advanced microscopy techniques for optimising the processing and design of ferritic stainless steels, with slight variations in the alloy composition, for deep drawing applications.

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“…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%

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

Cited by 72 publications

References 41 publications

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

Remarkable Wear Resistance in a Complex Concentrated Alloy with Nanohierarchical Architecture and Composition Undulation

A Combined Microscopy Study of the Microstructural Evolution of Ferritic Stainless Steel upon Deep Drawing: The Role of Alloy Composition

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

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