Prevention of Weld Decay of Austenitic Stainless Steels by Grain Boundary Engineering

Tokita, Shun; Kokawa, Hiroyuki; Sato, Shinya; Fujii, Tomoyuki

doi:10.2207/jjws.85.588

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…CSL boundary act as an intrinsic factor that provides resistance to the initiation and propagation of cracks, and the texture is an external factor whose intensity determines whether CSL boundaries appear. From the aforementioned results and analyses, it is demonstrated that the texture types have close links with CSL boundaries exerting influence on the cleavage crack propagation. Concretely speaking, a twin relationship (60°<111>) existing between{111} <110> and {111} <112> orientations constitutes twin boundary (∑3), and ∑9 (35°<110>) CSL boundaries form between {111} <110> and{112} <110> orientations, as well as {001} <110>, {111} <110> and {111} <112> orientations constitute∑11 (54°<110>) CSL boundaries.…”

Section: Discussionmentioning

confidence: 99%

Effects of Coincident Site Lattice Grain Boundaries and Ordered Structures on Mechanical Properties of High Silicon Steel

Cai

Huang

2018

steel research int.

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The coincident site lattice (CSL) grain boundaries and ordered structures of high silicon steel are investigated through different warm rolling reductions. The results reveal that the plastic deformation ability of Fe-6.9 wt%Si warmrolled sheet mainly depends on the total content of special P CSL boundaries and antiphase domain of ordered structures. With the increase of rolling reductions from 65% to 86%, the superdislocation glide behavior of warmrolled sheets is changed into the single dislocation glide, as well as the fragmentation behavior of ordered structures at different rolling reductions causes a decrease in the sizes of antiphase domains. While the sharp and homogeneous distribution of γ-orientation texture is beneficial to obtain a large fraction of P CSL boundaries that have great contribute to high resistance to the initiation and propagation of cracks. In the three-point bending tests, the values of fracture deflection improves from 3.5 mm to 12.1 mm, and the mixed fracture mode of inter-and trans-granular is transformed into quasi-cleavage fracture mode, which indicates the high rolling reduction is conducive to the improvement of plastic deformation ability.

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Section: Discussionmentioning

confidence: 99%

Effects of Coincident Site Lattice Grain Boundaries and Ordered Structures on Mechanical Properties of High Silicon Steel

Cai

Huang

2018

steel research int.

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“…(EBSD) is available to provide microstructure information such as crystalline grain's phase and its orientation, 11) therefore, in-situ observation based on SEM/EBSD measurement during heat treatment recently has been known as very popular technique. [12][13][14][15][16][17][18][19][20][21][22][23] Since bainitic and martensitic transformation are occurred by rapid cooling of austenite such as oil quench and water quench, a rapid cooling system is required to directly observe the above transformation in an in-situ SEM/EBSD observation system. However, it is difficult to cool down a sample quickly because the sample is placed in a vacuum chamber of the system.…”

Section: Development Of In-situ Orientation Mapping and Microstructure Observation System For Ferrite/austenite And Martensitic Transformmentioning

confidence: 99%

Development of <i>In-situ</i> Orientation Mapping and Microstructure Observation System for Ferrite/Austenite and Martensitic Transformations in Steel

et al. 2020

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The unique in-situ SEM/EBSD observation system, which is available to carry out orientation mapping and microstructure observation at high temperature, was developed to observe ferrite/austenite and martensitic transformation of carbon steel directly. The system has the heating capacity over 1 000°C and rapid cooling ability of the cooling rate faster than 100°C/s. The SIM imaging shows very good performance to observe quick change in crystalline grain's shape, and microstructural evolution of secondary recrystallization grains was successfully observed. Furthermore, the in-situ observation system was applied to observe martensitic transformation of plain carbon steel and nickel contained carbon steel. Crystalline grain shape and its orientation before and after martensitic transformation of the steel are observed at the same sample position. And direct comparison of the microstructures between austenite and martensite is successfully realized.

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“…For example, while some techniques exist to image behavior such as defect diffusion or surface diffusion in atomic systems, a PAE proxy system would allow for investigation into changing one parameter, such as bond energy, without altering any other properties like building block size or bond directions. Additionally, in situ microscopy would enable direct observation of phenomena like grain formation and grain growth mechanisms which have been hypothesized for atomic grains but prove incredibly difficult to track at the level of each individual atom . Ultimately, such a technological advance would allow for the use of PAEs to investigate any number of crystallization mechanisms including TTT behavior in nanoscale PAEs, Ostwald ripening versus oriented reattachment of crystallites, defect formation, grain boundary diffusion, plastic deformation, and crystal growth both homogenously and heterogeneously at interfaces.…”

Section: Future Areas Of Investigation For Pae Crystallizationmentioning

confidence: 99%

Programmable Atom Equivalents: Atomic Crystallization as a Framework for Synthesizing Nanoparticle Superlattices

Gabrys

Zornberg

Macfarlane

2019

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Decades of research efforts into atomic crystallization phenomenon have led to a comprehensive understanding of the pathways through which atoms form different crystal structures. With the onset of nanotechnology, methods that use colloidal nanoparticles (NPs) as nanoscale “artificial atoms” to generate hierarchically ordered materials are being developed as an alternative strategy for materials synthesis. However, the assembly mechanisms of NP‐based crystals are not always as well‐understood as their atomic counterparts. The creation of a tunable nanoscale synthon whose assembly can be explained using the context of extensively examined atomic crystallization will therefore provide significant advancement in nanomaterials synthesis. DNA‐grafted NPs have emerged as a strong candidate for such a “programmable atom equivalent” (PAE), because the predictable nature of DNA base‐pairing allows for complex yet easily controlled assembly. This Review highlights the characteristics of these PAEs that enable controlled assembly behaviors analogous to atomic phenomena, which allows for rational material design well beyond what can be achieved with other crystallization techniques.

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Prevention of Weld Decay of Austenitic Stainless Steels by Grain Boundary Engineering

Cited by 4 publications

References 22 publications

Effects of Coincident Site Lattice Grain Boundaries and Ordered Structures on Mechanical Properties of High Silicon Steel

Effects of Coincident Site Lattice Grain Boundaries and Ordered Structures on Mechanical Properties of High Silicon Steel

Development of <i>In-situ</i> Orientation Mapping and Microstructure Observation System for Ferrite/Austenite and Martensitic Transformations in Steel

Programmable Atom Equivalents: Atomic Crystallization as a Framework for Synthesizing Nanoparticle Superlattices

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