Serration of Grain Boundary in Ni-300Fe Alloy through High Temperature Deformation.

Suh, Dong‐Woo; Inoue, Tatsuo; Torizuka, Shiro; Ohmori, Akio; Nagai, Kotobu

doi:10.2355/isijinternational.42.1026

Cited by 13 publications

(10 citation statements)

References 12 publications

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“…10) Suh et al 2) showed that the boundary serration is temperature dependent and believed that the interaction between boundaries and sub-boundaries is responsible for the development of the serrations.…”

Section: Resultsmentioning

confidence: 99%

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Mapping the Hot Deformation Microstructure of Ni-30Fe Alloy

2005

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Section: Resultsmentioning

confidence: 99%

“…The present work is concerned with the construction of microstructural maps in strain-temperature space for hot deformation conditions of interest to industry. As maps of this general nature have been used by others 2,3) we aim to show their usefulness in conveying a wide range of information about hot deformation.…”

Section: Introductionmentioning

confidence: 99%

Mapping the Hot Deformation Microstructure of Ni-30Fe Alloy

2005

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“…On the other hand, Suh et al 13) showed that grain boundaries in fcc-matrix phase in the Ni-Fe alloy were serrated at a relatively early stage of hot deformation, and subsequently region near grain boundaries was dynamically recrystallised into fine equiaxed grains beyond a critical strain. This dynamic recrystallisation is considered to occur through continuous dynamic recrystallisation instead of discontinuous dynamic recrystallisation.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9] The dynamic transformation is known to occur when a specimen is deformed just above the ferrite transformation start temperature (Ar3). To understand the underlying mechanism of grain-refinement through dynamic transformation, hot-deformed microstructures of austenite have been intensively examined by several researchers, [10][11][12][13] because it is closely related to final ferrite microstructures.…”

Section: Introductionmentioning

confidence: 99%

“…The hot-deformed microstructure of austenite has been studied using a model alloy such as Ni-30mass%Fe [10][11][12][13] to avoid the difficulty in observing austenite at room temperature due to inevitable martensitic transformation during cooling. Stacking fault energy of the Ni-Fe alloy is around 75 mJ/m 2 , 14) which is close to that of austenite in low carbon steels, so that deformation characteristics including dislocation substructures of the alloy are expected to be similar to that of low carbon steels.…”

Section: Introductionmentioning

confidence: 99%

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Coherent-to-Incoherent Transition of Intergranular bcc-precipitates by Pre-/Post-deformations in a Ni-43Cr Alloy

Adachi

Tsuzaki

2005

ISIJ Int.

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Effects of light deformations before and after precipitation (pre-deformation and post-deformation) on orientation distribution of intergranular bcc-precipitates were examined in a Ni-43mass%Cr alloy by electron backscattered diffraction. It was found that the deviation angles from both the plane/direction parallel orientation relationships in the Kurdjumov-Sachs orientation relationship of intergranular precipitates were increased by both pre-and post-deformations, but post-deformation was more effective. Based on this result, microstructural evolution of intergranular precipitates formed dynamically was discussed with particular attention to coherent-to-incoherent transition of precipitates.

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Effect of initial grain size of austenite on hot-deformed structure of Ni-30Fe alloy

Suh

Cho

Nagai

2004

Metall Mater Trans A

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The microstructural evolutions of Ni-30Fe alloys during hot deformation are investigated. Hot-deformed structures of Ni-30Fe alloys with initial austenite grain sizes of 20 and 140 m are examined under various compressive strains and deformation temperatures. As the initial austenite grain size decreases, dynamic recrystallization (DRX) occurs at lower compressive strain and lower deformation temperature. At deformation temperatures where dynamic recovery occurs instead of the DRX, hot-deformed structures consist of recovered elongated grains until fine-equiaxed grains are evolved by geometric DRX. Critical compressive strain for the geometric DRX decreases with the decrease of initial austenite grain size. Geometric DRX is evolved by the impingement of serrated grain boundaries. The decrease of initial grain size is considered to reduce the critical compressive strain needed for the impingement of serrated grain boundaries. The changes in the effective thickness of austenite grain according to the compressive deformation are examined and the effects of the restoration processes on the effective thickness of austenite grain are discussed.

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Serration of Grain Boundary in Ni-300Fe Alloy through High Temperature Deformation.

Cited by 13 publications

References 12 publications

Mapping the Hot Deformation Microstructure of Ni-30Fe Alloy

Mapping the Hot Deformation Microstructure of Ni-30Fe Alloy

Coherent-to-Incoherent Transition of Intergranular bcc-precipitates by Pre-/Post-deformations in a Ni-43Cr Alloy

Effect of initial grain size of austenite on hot-deformed structure of Ni-30Fe alloy

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