Texture and microstructure of ultra low carbon steel processed by equal channel angular extrusion

Eddahbi, M.; Rauch, E.F.

doi:10.1016/j.msea.2008.10.024

Cited by 15 publications

(6 citation statements)

References 35 publications

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“…3b reveals. In addition, the martensite fraction is considerably reduced and the texture turns around the h111i and h110i axes, which is in agreement with other texture measurements in steel [17,18]. This fragmentation process is accompanied by microscopic changes regarding the microtexture and the phase characteristics.…”

Section: Resultssupporting

confidence: 90%

“…In contrast, equal channel angular pressing (ECAP) is the most popular severe plastic deformation (SPD) technique for developing UFG or nanograined microstructures [16]. ECAP deformation can also induce remarkable changes in the crystallographic texture and microtexture of steels, as well as in the distribution of the second-phase particles [17,18]. In addition, the ECAP processing can contribute to develop high-stress concentrations at second-phase particles, grain boundaries, and some other defects giving rise to vacancy sinks and potential sites for void nucleation.…”

Section: Introductionmentioning

confidence: 99%

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Grain boundary misorientation and positron annihilation characteristics in steel Eurofer processed by equal channel angular pressing

et al. 2014

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Electron back-scattered diffraction and positron annihilation lifetime measurements were performed on the ferritic-martensitic 9 %Cr Eurofer steel processed by equal channel angular pressing (ECAP) at 550°C. The orientation imaging mapping images reveal ECAP-induced changes toward a more stable texture via rotation around h111i and h110i axes. These are accompanied by transformation of martensite into ferrite and a remarkable change in the bimodal distribution of grain misorientations with reduction of the fraction of high-angle grain boundaries. The positron annihilation measurements evidence the release of vacancies retained in the ECAP-processed material and their clustering into nanovoids in samples heat treated at T C 500°C. It is found that tensile strain applied at 600°C can inhibit this void formation in the ECAPdeformed material for 1 and 2 passes, but not in the case of 4 passes. A model for accounting the results is proposed.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Grain boundary misorientation and positron annihilation characteristics in steel Eurofer processed by equal channel angular pressing

et al. 2014

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“…The weak fibers, labeled W 1 , W 2 and W 3 can be described by (1 0 6 orientations. The present ECAP induced texture in the steel EUROFER 97 contrast with the fiber texture 111 and 100 and the fibers {110} u v w and {hkl} 111 reported for low carbon and interstitial-free (IF) steels ECAP deformed at room temperature [9,16]. The dis-crepancies could be attributed to the differences in the ECAP parameters as well as to the high content of carbide particles in EUROFER 97.…”

Section: Tem Observationsmentioning

confidence: 48%

“…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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“…For example, structural analysis in work of O. Saray [12] showed that in a result of a severe plastic deformation with ECAP grains were divided into smaller volumes, however, the increase of the deformation did not result in obtaining a large fraction of ultrafine grain boundaries with high-angle boundaries (HAGBs), and strain hardening of the material is attributed to relatively high density of dislocations and the presence of dislocation boundaries which are geometrically necessary boundaries (GNBs) and incidental dislocation boundaries IDBs. The detailed evolution of microstructure and identification the mechanism of grain refinement in the interstitial free steel during plastic deformation by SPD methods is an issue which is not yet completely understood [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The effect of severe plastic deformation on the IF steel properties, evolution of structure and crystallographic texture after dual rolls equal channel extrusion deformation

Jabłońska

Kowalczyk

Tkocz

et al. 2021

Archiv.Civ.Mech.Eng

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This paper presents some results of the influence of severe plastic deformation on the microstructure evolution, grain refinement aspect, and mechanical properties of ultra-low carbon steel. Ti-stabilized experimental IF steel was deformed at a room temperature with unconventional SPD process—dual rolls equal channel extrusion (DRECE). Mechanical properties and structure of ferritic steel in initial state and after selected steps of deformation were investigated. The mechanical properties were determined by static tensile tests carried out at a room temperature and microhardness research. The structural investigations involved using scanning transmission electron microscopy observations, electron back scattered diffraction and measurements of the crystallographic texture. The DRECE process affects the evolution of the structure. The microstructural investigations revealed that the processed strips exhibited a dislocation cell and grain structures with mostly low angle grain boundaries. The electron backscattering diffraction (EBSD) examination showed that the processed microstructure is homogeneous along the strips thickness. The mechanical properties of the DRECE-processed IF steel strips increased with an increase the number of passes.

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Texture and microstructure of ultra low carbon steel processed by equal channel angular extrusion

Cited by 15 publications

References 35 publications

Grain boundary misorientation and positron annihilation characteristics in steel Eurofer processed by equal channel angular pressing

Grain boundary misorientation and positron annihilation characteristics in steel Eurofer processed by equal channel angular pressing

Texture and mechanical properties of EUROFER 97 steel processed by ECAP

The effect of severe plastic deformation on the IF steel properties, evolution of structure and crystallographic texture after dual rolls equal channel extrusion deformation

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