Microstructural changes in equal channel angular pressed low carbon steel by static annealing

Shin, Dong Hyuk; Kim, Byung Cheol; Park, Kyung‐Tae; Choo, W. Y.

doi:10.1016/s1359-6454(00)00090-2

Cited by 154 publications

(51 citation statements)

References 29 publications

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“…Many previous investigations 6,7,22) revealed enhanced grain growth behavior of ECAPed metals and alloys compared to those produced by conventional working processes due to relatively large accumulated strain. For full utilization of advantages arising from an ultrafine grain structure, it is essential to ensure thermal stability of these materials.…”

Section: Annealed Statementioning

confidence: 98%

“…[3][4][5] However, the microstructures of UFG materials produced by SPD, including low carbon steels, are known to be thermally unstable due to their non-equilibrium nature. [6][7][8] This implies that grain growth easily occurs in these materials, causing the loss of mechanical superiority associated with an UFG structure. Therefore, for full utilization of UFG low carbon steels produced by SPD, it is essential to ensure a thermal stability.…”

Section: Introductionmentioning

confidence: 99%

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Ultrafine Grained Low Carbon Steels Fabricated by Equal Channel Angular Pressing: Microstructures and Tensile Properties.

et al. 2002

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Equal channel angular pressing (ECAP) was conducted on the two grades of low carbon steel, with or without vanadium, in order to produce an ultarfine grained structure. As a result, the ferrite grains were refined from 30 mm to 0.2ϳ0.3 mm. The strength of the ECAPed steels increased remarkably, over twice of the strength of the steels before ECAP. A series of static annealing experiments showed that the increment of ECAP strain and the dilute addition of microalloying element such as vanadium were very effective on enhancing thermal stability of the ultrafine gained low carbon steels produced by ECAP in terms of microstructure and tensile properties. This enhanced thermal stability resulted from; (a) presence of excessive carbon content in the ferrite matrix by carbon dissolution from pearlitic cementite during ECAP; (b) preservation of high dislocation density due to addition of vanadium, providing the effective diffusion path for dissolved carbon atoms; (c) precipitation of excessive carbon as the form of nano-sized cementite particles during subsequent annealing and its effect on suppressing grain growth.

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Section: Annealed Statementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Ultrafine Grained Low Carbon Steels Fabricated by Equal Channel Angular Pressing: Microstructures and Tensile Properties.

et al. 2002

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“…In small grains, very few lattice dislocations are observed; in grains of intermediate size, a high-density of lattice dislocations exist; in large grains, subgrains are observed [10]. The nanostructures of metals and alloys processed by ECAP and HPT techniques have been reported by many research groups [10,[25][26][27]. In the following, the nanostructures and crystalline defects in a copper processed by RCS will be presented.…”

Section: Nanostructuresmentioning

confidence: 99%

Properties and Nanostructures of Materials Processed by SPD Techniques

Zhu¹,

Huang²

2002

Ultrafine Grained Materials II

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Metallic materials usually exhibit higher strength but lower ductility after being plastically deformed by conventional techniques such as rolling, drawing and extrusion. In contrast, nanostructured metals and alloys processed by severe plastic deformation (SPD) have demonstrated both high strength and high ductility. This extraordinary mechanical behavior is attributed to the unique nanostructures generated by SPD processing. It demonstrates the possibility of tailoring the microstructures of metals and alloys by SPD to obtain superior mechanical properties. The SPD-generated nanostructures have many features related to deformation, including high dislocation densities, and high-and low-angle grain boundaries in equilibrium or non-equilibrium states. This paper reviews the mechanical properties and the defect structures of SPD-processed nanostructured materials.

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“…The majority of papers on SPD materials have been devoted to the face-centered cubic (FCC) materials such as Al [5], Cu [6] and Ni [7]. For body-centered cubic (BCC) metals, carbon steels have mostly been studied [8][9][10][11][12][13][14][15][16] from a practical view point.…”

Section: Introductionmentioning

confidence: 99%

Microstructural Development of Fe-20mass%Cr Alloys and Pure Copper Processed by Equal-Channel Angular Pressing

Rifai¹,

Haga²,

Miyamoto³

et al. 2013

MSA

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Microstructural development of ultra low C, N, Fe-Cr alloy and pure copper processed by equal-channel angular pressing (ECAP) have been examined focusing on the initial stage of the formation of ultrafine grain structure. Fe-Cr alloys were pressed at 423 K while pure copper at room temperature for 1 to 3 passes via the route Bc to compare at the equivalent homologous temperature. Microstructural evolutions were characterized by electron backscatter diffraction (EBSD) image and transmission electron microscopy (TEM). It was found that deformation structures were mostly deformation-induced subboundaries in both the materials after one pass, but the fraction of high-angle grain boundary became higher in the Fe-Cr alloys than in pure copper in subsequent passes by increasing misorientation of the boundaries. The more enhanced formation of high angle boundaries in Fe-Cr alloys was discussed in terms of the nature of crystal slip of FCC and BCC structures.

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Microstructural changes in equal channel angular pressed low carbon steel by static annealing

Cited by 154 publications

References 29 publications

Ultrafine Grained Low Carbon Steels Fabricated by Equal Channel Angular Pressing: Microstructures and Tensile Properties.

Ultrafine Grained Low Carbon Steels Fabricated by Equal Channel Angular Pressing: Microstructures and Tensile Properties.

Properties and Nanostructures of Materials Processed by SPD Techniques

Microstructural Development of Fe-20mass%Cr Alloys and Pure Copper Processed by Equal-Channel Angular Pressing

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