Grain boundary engineering of AL6XN super-austenitic stainless steel: Distinctive effects of planar-slip dislocations and deformation twins

Guan, Xianjun; Shi, Feng; Jia, Zipeng; Li, X.W.

doi:10.1016/j.matchar.2020.110689

Cited by 21 publications

(4 citation statements)

References 54 publications

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“…As seen from Table 2, the f SBs in the specimens with 10% cold reduction is lowest, which is closely related to the appearance of DTs under this cold reduction. Our previous investigations have reported that both SFs and planar slip bands can induce the formation of annealing twin (AT) during the subsequent annealing process in Cu-16at%Al alloy [36] and AL6XN super ASS [37]; however, on the contrary, DTs would greatly hinder the formation of ATs in the above two alloys [36,37]. A similar phenomenon is also observed in the present high-nitrogen ASS with low SFE, namely, the appearance of a large number of SFs and some planar slip bands in the specimen with 5% reduction brings about the highest f SBs during the subsequent annealing (Table 2).…”

Section: Deformed Microstructure and Evolution Of Gbcdmentioning

confidence: 99%

“…ATs tend to form at the trailing edge of the migrating GHABs when SFs and planar slip bands in the pre-deformation (cold-rolled) microstructures encounter migrating GHABs. However, the DTs in pre-deformation microstructures are detrimental to the growth of TRD, thus impairing GBCD optimization [36,37]. Therefore, the optimal pre-deformation to achieve the GBCD optimization should be slightly lower than the critical deformation amount of 10%, at which DTs start to nucleate.…”

Section: Deformed Microstructure and Evolution Of Gbcdmentioning

confidence: 99%

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Improving Intergranular Stress Corrosion Cracking Resistance in a Fe–18Cr–17Mn–2Mo–0.85N Austenitic Stainless Steel Through Grain Boundary Character Distribution Optimization

Shi

Yan

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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The grain boundary character distribution (GBCD) optimization and its effect on the intergranular stress corrosion cracking (IGSCC) resistance in a cold-rolled and subsequently annealed Fe-18Cr-17Mn-2Mo-0.85N high-nitrogen nickel-free austenitic stainless steel were systematically explored. The results show that stacking faults and planar slip bands appearing at the right amount of deformation (lower than 10%) are beneficial cold-rolled microstructures to the GBCD optimization. The proportion of special boundaries gradually increases in the subsequent stages of recrystallization and grain growth, accompanying with the growth of twin-related domain in the experimental steel. In this way, the fraction of low Σ coincidence site lattice (CSL) boundaries can reach as high as 82.85% for the specimen cold-rolled by 5% and then annealed at 1423 K for 72 h. After GBCD optimization, low Σ CSL boundaries and the special triple junctions (J2, J3) of high proportion can greatly hinder the nitride precipitation along grain boundaries and enhance the capability for intergranular crack arrest, thus improving the IGSCC resistance of the experimental steel.

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Section: Deformed Microstructure and Evolution Of Gbcdmentioning

confidence: 99%

Section: Deformed Microstructure and Evolution Of Gbcdmentioning

confidence: 99%

Improving Intergranular Stress Corrosion Cracking Resistance in a Fe–18Cr–17Mn–2Mo–0.85N Austenitic Stainless Steel Through Grain Boundary Character Distribution Optimization

Shi

Yan

et al. 2022

Acta Metall. Sin. (Engl. Lett.)

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“…2, Σ3, Σ5, and Σ9 are the three most common GB types in austenitic stainless steels. [41,42] The segregation of Mo leads to σ phase formation, and the content of Cr in σ phase is also higher than that in the matrix. of segregated Mo atoms in the GB region is only 6.…”

Section: B Effect On Gb Segregation Tendencies Of Momentioning

confidence: 99%

Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study

Xu¹,

Ma²,

Zhang³

et al. 2022

Chinese Phys. B

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Precipitation in super-austenitic stainless steels will significantly affect their corrosion resistance and hot workability. The effects of Cr and Mo on precipitation behaviors were mainly achieved by affecting the driving force for precipitation, especially Mo has a more substantial promotion effect on the formation of the σ phase than Cr. In the present study, B addition to the S31254 super-austenitic stainless steels shows an excellent ability to inhibit precipitation. The effect of B on the precipitation behaviors was investigated by microstructure characterization and theoretical calculations. The experimental observation shows that the small addition of B inhibits the formation of the σ phase along grain boundaries and changes from continuous to intermittent distribution. Moreover, the inhibitory effect increased obviously with the increase of B content. The influence of B addition was theoretically analyzed from the atomic level, and the calculation results demonstrate that B can inhibit the formation of σ phase precipitates by suppressing Mo migration to grain boundaries. It is found that B and Mo are inclined to segregate at Σ5 and Σ9 grain boundaries, with B showing the most severe grain boundary segregation tendency. While B distribution at the grain boundary before precipitation begins, the segregation of Mo and Cr will be restrained. Additionally, B’s occupation will induce a high potential barrier, making it difficult for Mo to diffuse towards grain boundaries.

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“…TMP can be categorised into two main approaches: strain-annealing and strain-recrystallisation. Both methods aim to increase the population of low-Σ (Coincidence Site Lattice) special grain boundaries (SBs) in metallic materials, which in turn modify random high-angle grain boundaries (RHAGBs) and hinder the connectivity of RHAGB networks [17]. However, materials with high SFEs face challenges in the development of twin structures or SBs.…”

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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Grain boundary engineering of AL6XN super-austenitic stainless steel: Distinctive effects of planar-slip dislocations and deformation twins

Cited by 21 publications

References 54 publications

Improving Intergranular Stress Corrosion Cracking Resistance in a Fe–18Cr–17Mn–2Mo–0.85N Austenitic Stainless Steel Through Grain Boundary Character Distribution Optimization

Improving Intergranular Stress Corrosion Cracking Resistance in a Fe–18Cr–17Mn–2Mo–0.85N Austenitic Stainless Steel Through Grain Boundary Character Distribution Optimization

Effects of B segregation on Mo-rich phase precipitation in S31254 super-austenitic stainless steels: Experimental and first-principles study

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

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