Grain refinement mechanism during equal-channel angular pressing of a low-carbon steel

Shin, Dong Hyuk; Kim, In-Young; Kim, Jongryoul; Park, Kyung‐Tae

doi:10.1016/s1359-6454(01)00010-6

Cited by 163 publications

(59 citation statements)

References 12 publications

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“…Ultrafine grained structures can be developed in metals by severe plastic deformation techniques (SPD), among which ECAP is a successful method to develop submicron microstructures in bulk steel [4][5][6][7][8][9]. The aim of the present work has been to explore the capability of warm ECAP for developing a stable grain structure and texture in tempered EUROFER 97 that can enhance its mechanical behavior in its operational temperature range, i.e.…”

Section: Introductionmentioning

confidence: 99%

Texture and mechanical properties of EUROFER 97 steel processed by ECAP

Eddahbi

Monge

Fernández

et al. 2011

Materials Science and Engineering: A

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Abstract:The EUROFER 97 steel was processed by equal channel angular pressing (ECAP) at 550 • C for four passes via route C. The starting material consisted of ferrite-martensite dual phase composed by small subgrains of about 0.5 m and low angle boundaries less than 5 • . The volume fraction of second phase particles was around 10 vol.%, besides a texture formed by several fibers orientations belonging to the zone axes 110 , 111 and 112 . Increasing ECAP deformation, this microstructure became into equiaxed grain structures of less than 1 m, and the misorientation between contiguous grains increased. This refine-ment of the microstructure was accompanied by the development of a new texture described by a family of fiber orientations related by rotations around axes 110 and 111 . Tensile tests have revealed that an ECAP treatment at 550 • C for two passes could significantly strengthen the tempered material still maintaining good ductility.

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Section: Introductionmentioning

confidence: 99%

Texture and mechanical properties of EUROFER 97 steel processed by ECAP

Eddahbi

Monge

Fernández

et al. 2011

Materials Science and Engineering: A

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“…For group 1: equal channel angular pressing (ECAP) [1], high pressure torsion (HPT) [2], twist extrusion (TE) [6], accumulative back extrusion (ABE) [7]; for group 2: equal channel angular rolling (ECAR) [8], accumulative roll bonding (ARB) [9], constrained groove pressing (CGP) [10]; and for group 3: high pressure tube twisting (HPTT) [11], accumulative spin bonding (ASB) [12], tubular channel angular pressing (TCAP) [13] are the major examples. It should be pointed out that the principal rule of all SPD methods consists of imposing shear stress to the sample, increasing the dislocation density in deformed material, formation of dense dislocation walls and then low angle grain boundaries (LAGBs), and, finally, transformation of LAGBs into high angle grain boundaries (HAGBs) [1,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Equal Channel Forward Extrusion Process

Ebrahimi

Djavanroodi

Tiji

et al. 2015

Metals

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Among all recognized severe plastic deformation techniques, a new method, called the equal channel forward extrusion process, has been experimentally studied. It has been shown that this method has similar characteristics to other severe plastic deformation methods, and the potential of this new method was examined on the mechanical properties of commercial pure aluminum. The results indicate that approximate 121%, 56%, and 84% enhancements, at the yield strength, ultimate tensile strength, and Vickers micro-hardness measurement are, respectively, achieved after the fourth pass, in comparison with the annealed condition. The results of drop weight impact test showed that the increment of 26% at the impact force, and also decreases of 32%, 15%, and 4% at the deflection, impulse, and absorbed energy, are respectively attained for the fourth pass when compared to the annealed condition. Furthermore, the electron backscatter diffraction examination revealed that the average grain size of the final pass is about 480 nm.

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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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Grain refinement mechanism during equal-channel angular pressing of a low-carbon steel

Cited by 163 publications

References 12 publications

Texture and mechanical properties of EUROFER 97 steel processed by ECAP

Texture and mechanical properties of EUROFER 97 steel processed by ECAP

Experimental Investigation of the Equal Channel Forward Extrusion Process

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

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