Microstructure evolution of CP titanium during deformation in KoBo process followed by cold rolling

Kawałko, Jakub; Bobrowski, Piotr; Koprowski, P.; Jarzębska, Anna; Bieda, M.; Łagoda, М.; Sztwiertnia, K.

doi:10.1016/j.jallcom.2016.11.202

Cited by 17 publications

(4 citation statements)

References 13 publications

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“…Using the scanning and transmission electron microscopes (the devices Philips SEM-515 with the microanalyzer EDAX ECON IV and JEM-2100F) as well as the mapping method 22 the elemental and phase compounds, the state of defect substructure 23 were examined. The friction properties such as the wear resistance and friction factor were performed tested at tribometers "Pin on Disc" and "Oscillating TRIBOtester".…”

Section: Materials and Methods Of Researchmentioning

confidence: 99%

Effect of Electron-Plasma Treatment on the Microstructure of Al-11wt%Si Alloy

et al. 2020

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The analysis of structure, defect substructure, elemental and phase compounds and friction properties of Al-11wt%Si alloy surface layer of subjected to complex treatment was carried out by methods of scanning and transmission electron microscopy. Complex treatment includes the electroexplosion influence by Al-Y 2 O 3 compound and subsequent electron beam irradiation. The surface layer ≈ 80 μm thick is formed by high-velocity crystallization cells of 0.8-1.3 μm in dimension. Interlayers 50-75 nm thick located along the cells of high-velocity crystallization are enriched by atoms of silicon and yttrium. Complex surface treatment leads to the increase by 18 times in wear resistance and decrease by 1.6 times in the friction factor of the modified layer.

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Section: Materials and Methods Of Researchmentioning

confidence: 99%

Effect of Electron-Plasma Treatment on the Microstructure of Al-11wt%Si Alloy

et al. 2020

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“…High plasticity of materials after KoBo is an important differentiating factor form other SPD techniques such as ECAP, as it allows further deformation and shaping of the material, without the need of annealing, which might lead to recrystallization and deterioration of mechanical properties [34].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Pawłowska¹,

Śliwa²,

Zwolak³

2019

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Basing on experimental data, the possibility of consolidating side products of turning, milling and drilling of aluminum alloys into the form and properties of solids metals using low-temperature KoBo extrusion method has been assessed. Research regarding mechanical and structural properties of the final products revealed their total consolidation and proved their compatibility with requirements for products made of bulk billets. Importantly, the chips consolidation process does not require high or even raised temperature, which significantly reduces the unfavorable phenomenon of chips oxidation and its negative influence on the structure and mechanical properties of products. A very good effect of chips compaction has been proved by KoBo method, which has been confirmed by relatively slightly different mechanical properties of the material after recycling compared with the bulk one. Among currently applied techniques of consolidation of dispersed fractions in a solid state (leaving the melting stage out), the KoBo method seems an innovative way of utilizing metallic chips, as it enables a cold deformation process.The paper presents investigations using 2024 and 7075 aluminum alloys chips from manufacturing process, formed into briquettes and deformed under conditions of KoBo extrusion process, which enables to obtain long product by cold forming. The final product characterized by good microstructures, mechanical features and low cost of production.

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“…The formation of ultra-fine grained (UFG) microstructure by KOBO processing have been investigated more intensively. This method has been applied to a wide range of metals, alloys and composites [5][6][7]. KOBO belongs to methods with cyclic changes in the strain path.…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

Sobota¹,

Rodak²,

Nowak³

2019

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In this article the structural and mechanical properties of grain refinement of Cu-Sn alloys with tin content of 10%, 15% and 20% using the KOBO method have been presented. The direct extrusion by KOBO (name from the combination of the first two letters of the names of its inventors -A. Korbel and W. Bochniak) method employs, during the course of the whole process, a phenomenon of permanent change of strain travel, realized by a periodical, two-sided, plastic metal torsion.Moreover the aim of this work was to study corrosion resistance. The microstructure investigations were performed using an optical microscope Olimpus GX71, a scanning electron microscope (SEM) and a scanning transmission electron microscope (STEM). The mechanical properties were determined with INSTRON 4505/5500 machine. Corrosion tests were performed using «Autolab» set -potentiostat/galvanostat from EcoChemie B.V. with GPES software ver. 4.9. The obtained results showed possibility of KOBO deformation of Cu-Sn casting alloys. KOBO processing contributed to the refinement of grains and improved mechanical properties of the alloys. The addition of tin significantly improved the hardness. Meanwhile, with the increase of tin content the tensile strength and yield strength of alloys decrease gradually. Ductility is controlled by eutectoid composition and especially δ phase, because they initiate nucleation of void at the particle/matrix interface. No significant differences in the corrosion resistance between cast and KOBO processed materials were found.

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Microstructure evolution of CP titanium during deformation in KoBo process followed by cold rolling

Cited by 17 publications

References 13 publications

Effect of Electron-Plasma Treatment on the Microstructure of Al-11wt%Si Alloy

Effect of Electron-Plasma Treatment on the Microstructure of Al-11wt%Si Alloy

Archives of Metallurgy and Materials

Archives of Metallurgy and Materials

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