Surface grain boundary engineering in 304 stainless steel by means of mechanical grinding treatment-induced gradient plastic strain and annealing

Jiang, Xinli; Yang, Chongwen; Zhang, Wenqian; Wang, Xuelin

doi:10.1007/s10853-022-07983-2

Cited by 3 publications

(2 citation statements)

References 49 publications

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“…It is to be noted here that although the structure and energy of grain boundary cannot be entirely determined via the Σ-value alone, these low-Σ CSL boundaries are frequently regarded as special. Recent research shows that only a portion of low-Σ CSL boundaries are exceptional [14,15]. However, much experimental data indicates that, compared to random boundaries (RBs), low-Σ CSL boundaries exhibit more excellent resistance against Materials 2024, 17, 1134 2 of 15 grain boundary degradation because they have a higher ordering degree, a lower interface energy, and a smaller free volume [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Grain Boundary Character Distribution in B10 Alloy from Friction Stir Processing to Annealing Treatment

Feng,

Zhou,

Wang

et al. 2024

Materials

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In this study, the grain boundary character distribution (GBCD) of a B10 alloy was optimized, employing thermomechanical processing consisting of friction stirring processing (FSP) and annealing treatment. Using electron backscatter diffraction, the effects of rotational speed of FSP and annealing time on the evolution of GBCD were systematically investigated. The GBCD evolution was analyzed concerning various parameters, such as the fraction of low-Σ coincidence site lattice (CSL) boundaries, the average number of grains per twin-related domain (TRD), the length of longest chain (LLC), and the triple junction distribution. The experimental results revealed that the processing of a 1400 rpm rotational speed of FSP followed by annealing at 750 °C for 60 min resulted in the optimum grain boundary engineering (GBE) microstructure with the highest fraction of low-Σ CSL boundaries being 82.50% and a significantly fragmented random boundary network, as corroborated by the highest average number of grains per TRD (14.73) with the maximum LLC (2.14) as well as the highest J2/(1 − J3) value (12.76%). As the rotational speed of FSP increased from 600 rpm to 1400 rpm, the fraction of low-Σ CSL boundaries monotonously increased. The fraction of low-Σ CSL boundaries first increased and then decreased with an increase in annealing time. The key to achieving GBE lies in inhibiting the recrystallization phenomenon while stimulating abundant multiple twinning events through strain-induced boundary migration.

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Section: Introductionmentioning

confidence: 99%

Evolution of Grain Boundary Character Distribution in B10 Alloy from Friction Stir Processing to Annealing Treatment

Feng,

Zhou,

Wang

et al. 2024

Materials

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“…Hence, the current essence of "grain boundary engineering" is to produce alloys with a high proportion of Σ3 twin boundaries (TB) and twin-related higher-order Σ3n (n = 2, 3; Σ ≤ 29) [12][13][14], referred to as low-sigma Coincidence Site Lattice (CSL) boundaries. As twin structures [15], including TBs, twins, and stacking faults (SFs), not only provide improved strength but also provide good ductility, harnessing the potential of CSL grain boundaries through precise manipulation and control therefore holds great promise for tailoring the properties of many polycrystalline materials [16].…”

Section: Introductionmentioning

confidence: 99%

Characterisation of Microstructure and Special Grain Boundaries in LPBF AlSi10Mg Alloy Subjected to the KoBo Extrusion Process

Snopiński,

Matus

2023

Symmetry

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Grain boundary engineering (GBE) enhances the properties of metals by incorporating specific grain boundaries, such as twin boundaries (TB). However, applying conventional GBE to parts produced through additive manufacturing (AM) poses challenges, since it necessitates thermomechanical processing, which is not desirable for near-net-shape parts. This study explores an alternative GBE approach for post-processing bulk additively manufactured aluminium samples (KoBo extrusion), which allows thermo-mechanical treatment in a single operation. The present work was conducted to examine the microstructure evolution and grain boundary character in an additively manufactured AlSi10Mg alloy. Microstructural evolution and grain boundary character were investigated using Electron Back Scattered Diffraction (EBSD) and Transmission Electron Microscopy (TEM). The results show that along with grain refinement, the fraction of Coincidence Site Lattice boundaries was also increased in KoBo post-processed samples. The low-Σ twin boundaries were found to be the most common Coincidence Site Lattice boundaries. On the basis of EBSD analysis, it has been proven that the formation of CSL boundaries is directly related to a dynamic recrystallisation process. The findings show prospects for the possibility of engineering the special grain boundary networks in AM Al–Si alloys, via the KoBo extrusion method. Our results provide the groundwork for devising GBE strategies to produce novel high-performance aluminium alloys.

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Dependence of intergranular precipitation on grain boundary characteristics in Ni–Cr–Fe–Mo–Cu alloy

Wang,

Deng,

2023

Journal of Materials Research and Technology

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Surface grain boundary engineering in 304 stainless steel by means of mechanical grinding treatment-induced gradient plastic strain and annealing

Cited by 3 publications

References 49 publications

Evolution of Grain Boundary Character Distribution in B10 Alloy from Friction Stir Processing to Annealing Treatment

Evolution of Grain Boundary Character Distribution in B10 Alloy from Friction Stir Processing to Annealing Treatment

Characterisation of Microstructure and Special Grain Boundaries in LPBF AlSi10Mg Alloy Subjected to the KoBo Extrusion Process

Dependence of intergranular precipitation on grain boundary characteristics in Ni–Cr–Fe–Mo–Cu alloy

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