Role of strain heterogeneity on recrystallisation of oxide dispersion strengthened Fe–Cr–Al alloys for high-temperature applications

Pimentel, George C.; Toda‐Caraballo, Isaac; Chao, Jesús; Capdevila, Carlos

doi:10.1007/s10853-012-6455-6

Cited by 9 publications

(6 citation statements)

References 24 publications

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“…The existence of a preferential orientation of <110> along the extrusion direction was also reported [13]. The corresponding φ 2 = 45 • section of the Euler space, using Bunge's angular system, confirms a strong incomplete α-fiber texture (<110> ED and <100> ND, where ED stands for the extrusion direction and ND for the normal direction) with a dominating rotated cube {001}<110> and a secondary {111} < 110 > component.…”

Section: Initial Microstructuresupporting

confidence: 65%

“…A relatively low dislocation density was observed [16]. It has been reported previously [10,13,14] that it has a higher frequency of low-angle grain boundaries (LAGB), i.e., with misorientation of between 4 • and 15 • , than a random distribution; meanwhile the frequency of high-angle grain boundaries (HAGB), i.e., with misorientation larger than 15 • , is lower than random.…”

Section: Initial Microstructurementioning

confidence: 62%

“…In summary, there is a need to explain why recrystallization temperature is so high, and why changes in processing, which induce relatively slight deformations in the ODS material, can produce enormous changes in the subsequent recrystallization behavior [13]. Therefore, the role played by plastic strains inferred during manufacturing in tuning the microstructure of these materials is of paramount importance to improving the in-service response of the material.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Extensive and Limited Plastic Deformation on Recrystallized Microstructure of Oxide Dispersion Strengthened Fe-Cr-Al Alloy

Capdevila

Rementería

Aranda

et al. 2018

Metals

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Ferritic oxide dispersion-strengthened alloys (ODS) are manufactured using a mechanical alloying process. The development of a coarse-grained microstructure during recrystallization has been detected and discussed by several authors, but the mechanism of grain growth remains uncertain. Recent work has emphasized the large influence of non-uniformities on the development of the recrystallized microstructure. The purpose of the present work is to study the effect of both slight heterogeneous plastic strains and strong directional deformation on recrystallization of a ferritic Fe-base ODS alloy.

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Section: Initial Microstructuresupporting

confidence: 65%

Section: Initial Microstructurementioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

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Effect of Extensive and Limited Plastic Deformation on Recrystallized Microstructure of Oxide Dispersion Strengthened Fe-Cr-Al Alloy

Capdevila

Rementería

Aranda

et al. 2018

Metals

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“…The microstructure consists of 20 lm grains of ferrite elongated in RD, with a fine, almost equiaxed, section of grain sizes $0.5 lm in the TS plane. As described elsewhere [17], the ODS particle reinforcement, i.e., complex Y-Al oxides, with sizes ranging from 3 to 40 nm are preferentially located at the ferrite grain boundaries. Besides these oxide particles, numerous large inclusions with complex compositions were found throughout the sample, which preferentially form large stringers in LS plane.…”

Section: Microstructure Of As-rolled Samplesmentioning

confidence: 78%

Effect of α–α′ phase separation on notch impact behavior of oxide dispersion strengthened (ODS) Fe20Cr5Al alloy

et al. 2014

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a b s t r a c tThe effects of Fe-rich (a) and Cr-enriched (a 0 ) phase separation, occurring during aging at 475°C on the microstructure and mechanical properties of Fe-20Cr-6Al ODS alloy (PM2000™) hot-rolled tube, were investigated by means of atom probe tomography, microhardness, tensile and V-notched Charpy impact tests. Disregarding of the aging treatment, this material presents splitting of crack-divider type in longitudinal-transverse (LT) specimens, whereas crack-arrester type is observed in longitudinal-short transverse (LS) specimens, which induces significant differences in ductile-to-brittle transition temperature (DBTT) and upper shelf energy (USE). Additionally, a significant increase in DBTT and decrease in USE were recorded during aging at 475°C as a function of aging time. The main cause of embrittlement is the a-a 0 phase separation with an apparent activation energy measured in the range of 214-240 kJ/ mol, which is consistent with the activation energy for Cr diffusion in this type of alloy.

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“…A grain aspect ratio (GAR) of 4.4 was measured for the grains of the LT plane. As described elsewhere [ 23 ], the ODS particle reinforcement (i.e., complex Y-Al oxides, with sizes ranging from 3 to 40 nm) are preferentially located at the ferrite grain boundaries. Besides these oxide particles, numerous large inclusions with complex compositions were found throughout the sample, which preferentially form large stringers in the LS plane.…”

Section: Resultsmentioning

confidence: 99%

Influence of Texture on Impact Toughness of Ferritic Fe-20Cr-5Al Oxide Dispersion Strengthened Steel

et al. 2017

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Fe-based oxide dispersion strengthened (ODS) steels are oriented to applications where high operating temperatures and good corrosion resistance is paramount. However, their use is compromised by their fracture toughness, which is lower than other competing ferritic-martenstic steels. In addition, the route required in manufacturing these alloys generates texture in the material, which induces a strong anisotropy in properties. The V-notched Charpy tests carried out on these alloys, to evaluate their impact toughness, reveal that delaminations do not follow the path that would be expected. There are many hypotheses about what triggers these delaminations, but the most accepted is that the joint action of particles in the grain boundaries, texture induced in the manufacturing process, and the actual microstructure of these alloys are responsible. In this paper we focused on the actual role of crystallographic texture on impact toughness in these materials. A finite elements simulation is carried out to solely analyze the role of texture and eliminate other factors, such as grain boundaries and the dispersed particles. The work allows us to conclude that crystallographic texture plays an important role in the distribution of stresses in the Charpy specimens. The observed delaminations might be explained on the basis that the crack in the grain, causing the delamination, is directly related to the shear stresses τ12 on both sides of the grain boundary, while the main crack propagation is a consequence of the normal stress to the crack.

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Role of strain heterogeneity on recrystallisation of oxide dispersion strengthened Fe–Cr–Al alloys for high-temperature applications

Cited by 9 publications

References 24 publications

Effect of Extensive and Limited Plastic Deformation on Recrystallized Microstructure of Oxide Dispersion Strengthened Fe-Cr-Al Alloy

Effect of Extensive and Limited Plastic Deformation on Recrystallized Microstructure of Oxide Dispersion Strengthened Fe-Cr-Al Alloy

Effect of α–α′ phase separation on notch impact behavior of oxide dispersion strengthened (ODS) Fe20Cr5Al alloy

Influence of Texture on Impact Toughness of Ferritic Fe-20Cr-5Al Oxide Dispersion Strengthened Steel

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