Influence of Rolling Path on Microstructure and Mechanical Properties in EB Refined Tantalum

Ayyagari, Aditya; Subramanian, P. K.; Krishna, V. Gopala; Babu, U. Chinta

doi:10.1007/s12666-012-0148-3

Cited by 16 publications

(6 citation statements)

References 20 publications

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“…Cross-rolling, or bi-directional rolling (BD), is a process in which the rolling direction between two following passes is perpendicular. This process is used to reduce the directional effects of straight rolling [12] and to induce a more homogeneous final structure [13]. Bi-directional rolling significantly symmetrizes the rolling textures, modifies residual stresses and plastic strain anisotropy [12,14].…”

Section: Introductionmentioning

confidence: 99%

Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants

et al. 2015

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“…In the work of Aditya et al [27] on cold rolling of tantalum sheets, a trend between cold reduction (strain) and Vickers hardness was clearly shown. An increment in average hardness was seen until cold reduction superior to 65%, where the hardness stabilised around 200 HV.…”

Section: The Relation Between Hardness and Strainmentioning

confidence: 92%

“…In general, a plateau of hardness was always seen around 210 HV -220 HV for the studies available in the literature, even for a high level of deformation. This saturation in formability and hardness is associated with the high density of dislocations, which obstacle their own further motion [27].…”

Section: The Relation Between Hardness and Strainmentioning

confidence: 99%

“…For tantalum components, investigations regarding the effect of rolling, high-pressure torsion and equal-channel angular pressing on the microstructural refinement have already been reported [26][27][28][29][30]. In particular, ultrafine and nanostructured tantalum components can be produced by applying severe plastic deformation steps to a conventional coarse-grained structure, achieving nanometre-size grains [28,31].…”

Section: Introductionmentioning

confidence: 99%

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Grain refinement in an unalloyed tantalum structure by combining Wire+Arc additive manufacturing and vertical cold rolling

Marinelli

Martina

Ganguly

et al. 2020

Additive Manufacturing

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Components manufactured via Wire + Arc Additive Manufacturing are usually characterised by large columnar grains. This can be mitigated by introducing in-process cold-rolling; in fact, the associated local plastic deformation leads to a reduction of distortion and residual stresses, and to microstructural refinement. In this research, interpass rolling was applied with a load of 50 kN to a tantalum linear structure to assess its effectiveness in changing the grain structure from columnar to equiaxed, as well as in refining the grain size. An average grain size of 650 µm has been obtained after five cycles of inter-pass rolling and deposition. When the deformed layer was reheated during the subsequent deposition, recrystallisation occurred, leading to the growth of new strain-free finer equiaxed grains. The depth of the refined region has been characterised and correlated to the hardness profile developed after rolling. A reduction of porosity was also registered. Furthermore, a random texture was formed after rolling, which should result in isotropic mechanical properties. Wire + Arc Additive Manufacturing process demonstrated the ability to deposit sound refractory metal components and the possibility to improve the microstructure when coupled with cold inter-pass rolling.

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“…For Ta, previous works indicated that changing rolling path had an intensive effect on the texture and microstructure evolution [10,11]. However, the effect of changing rolling path on deformation substructure of Ta was not reported yet.…”

Section: Introductionmentioning

confidence: 97%

Revealing substructure in clock-rolled Ta aided with triple focused ion beam

et al. 2015

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Clock rolling was developed to make deformation microstructure homogenize in high-purity Ta. The substructure of deformed Ta was revealed by electron back-scatter diffraction (EBSD) technique aided with triple focused ion beam (FIB). The results indicate that the triple FIB method can produce a mirror surface required by EBSD analysis. The clock rolling works well for the homogenization of deformed microstructure. Particularly, the local stored energy in {111} orientated grains is largely reduced by clock rolling, whereas it is enhanced in {100} orientated grains because of the occurrence of grain subdivision.

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Influence of Rolling Path on Microstructure and Mechanical Properties in EB Refined Tantalum

Cited by 16 publications

References 20 publications

Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants

Influence of cross-rolling on the micro-texture and biodegradation of pure iron as biodegradable material for medical implants

Grain refinement in an unalloyed tantalum structure by combining Wire+Arc additive manufacturing and vertical cold rolling

Revealing substructure in clock-rolled Ta aided with triple focused ion beam

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