Application of Workability Test to Spd Processing

Kvačkaj, Tibor; Kočiško, Róbert; Tiža, Juraj; Bidulská, Jana; Kováčová, Andrea; Bidulský, Róbert; Bacsó, J.; Vlado, Martin

doi:10.2478/amm-2013-0008

Cited by 30 publications

(34 citation statements)

References 3 publications

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“…Experimental data about the role of subsurface evaluation in terms of workability is still limited, especially in a newly progressive processing -ECAP, orbital forming [55][56][57], where workability is one of the most important artefact in UFG materials, according to Kvačkaj [58]. The results of wear rate vs sliding distance are presented in Fig.…”

Section: Study Of Tribological Propertiesmentioning

confidence: 99%

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

Kvačkaj¹,

Kováčová²,

Bidulská³

et al. 2015

Archives of Metallurgy and Materials

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In this study, static, dynamic and tribological properties of ultrafine-grained (UFG) oxygen-free high thermal conductivity (OFHC) copper were investigated in detail. In order to evaluate the mechanical behaviour at different strain rates, OFHC copper was tested using two devices resulting in static and dynamic regimes. Moreover, the copper was subjected to two different processing methods, which made possible to study the influence of structure. The study of strain rate and microstructure was focused on progress in the mechanical properties after tensile tests. It was found that the strain rate is an important parameter affecting mechanical properties of copper. The ultimate tensile strength increased with the strain rate increasing and this effect was more visible at high strain rates (ε ∼10 2 s −1 ). However, the reduction of area had a different progress depending on microstructural features of materials (coarse-grained vs. ultrafine-grained structure) and introduced strain rate conditions during plastic deformation (static vs. dynamic regime). The wear behaviour of copper was investigated through pin-on-disk tests. The wear tracks examination showed that the delamination and the mild oxidational wears are the main wear mechanisms.Keywords: OFHC copper, UFG, ECAP, strain rate, fractography, wear resistance W pracy zbadano szczegółowo statyczne, dynamiczne i tribologiczne właściwości ultra drobnoziarnistej (UFG) beztlenowej miedzi o wysokiej przewodności cieplnej (OFHC). W celu oceny właściwości mechanicznych przy różnych szybkościach odkształcenia, miedź OFHC badano za pomocą dwóch urządzeń w warunkach statycznych i dynamicznych. Ponadto miedź poddano dwóm różnym sposobom przetwarzania, co umożliwiło badanie wpływu struktury. Badanie szybkości odkształcenia i mikrostruktury koncentrowało się na zmianie właściwości mechanicznych po próbie rozciągania. Stwierdzono, że szybkość odkształcania jest ważnym parametrem wpływającym na właściwości mechaniczne miedzi. Wytrzymałość na rozciąganie wzrosła ze wzrostem szybkości odkształcenia i ten efekt był bardziej widocznyprzy dużej szybkości odkształcania (ε ∼10 2 s −1 ). Jednak zmniejszenie obrazu przebiegało inaczej w zależności od cech mikrostruktury materiałów (struktura gruboziarnista a struktura ultra drobnoziarnista) i zadanych warunków szybkości odkształcenia podczas odkształcenia plastycznego (warunki statyczne a warunki dynamiczne). Zużycie miedzi badano za pomocą testów zarysowania. Badanie ścieżek zużycia wykazało, że delaminacja i umiarkowane utlenienie to główne mechanizmy zużycia.

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Section: Study Of Tribological Propertiesmentioning

confidence: 99%

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

Kvačkaj¹,

Kováčová²,

Bidulská³

et al. 2015

Archives of Metallurgy and Materials

Self Cite

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“…Thus, in metalworking industry, there is a need for predicting and preventing fracture which has a significant influence on the quality of products. Hence, understanding the conditions in which a ductile fracture (occurrence of internal or surface fracture in the sample) emerges is a key task in most bulk metal -forming processes [1]. Nowadays, there exist a lot of criteria based on various hypotheses which have been proposed empirically as well as theoretically [2,3].…”

Section: Introductionmentioning

confidence: 99%

Physical and Numerical Determination of Workability in Aluminium Alloys

Kováčová¹,

Kvačkaj²,

Kočiško³

et al. 2014

Acta Metall Slovaca

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To prevent any failure or fracture in materials during a forming process, the study of material workability is a crucial task. In this paper, the workability of two different aluminium alloys was described through Cockcroft -Latham ductile fracture criteria and forming limit diagrams. Moreover, the experiments have been carried out using compression tests and finite element methods and there was able to compare and verify the physical and numerical approaches. According to the results, there was found out that physical and numerical models are advantageous tools to describe the material workability during forming processes and the optimal data are obtained when both approaches are working together.

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“…The significant improvement in properties of the alloy can be achieved by a suitable combination of mentioned heat treatment followed by application the severe plastic deformation. Influence of the severe plastic deformation is to achieve ultra-fine grained structure optionally nanostructure [19][20][21][22][23]. ECAP technique (Equal channel angular pressing) is the most used technique from the severe plastic deformation methods.…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment on Properties of en Aw 6082 Aluminium Alloy

Lacková¹,

Buršák²,

Milkovič³

et al. 2015

Acta Metall Slovaca

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The main aim of this work is to point out on possibility of properties improving of the aluminium alloy EN AW 6082 (AlSi1MgMn) with an appropriate combination of pre-ECAP solution annealing, the application of the severe plastic deformation by ECAP technology (equal channel angular pressing) and post-ECAP artificial aging. The effect of the severe plastic deformation and artificial aging on the alloy structure was evaluated by metallographic analysis, and alloy mechanical properties by uniaxial tensile test at room temperature, the Vickers hardness and by tribology test of resistance to abrasive wear. As a result of strain hardening by severe plastic deformation it reaches the improvement in hardness (by 56%), strength characteristics (yield strength by 92%, tensile strength by 29%) and abrasion wear resistance is 28 %. Keywords: severe plastic deformation, tension test, aluminium alloys, wear IntroductionThe aluminium alloys belonging to 6XXX groups, which are widely used in structural applications, the construction industry, the automotive industry and architectural section as extrusions products [1]. AlSi1MgMn alloy is characterized by good mechanical properties, resistance to tribology (abrasion wear) and corrosion degradation, low density. Due to good tribological properties of alloy can be used in excellent application. These properties can be increased by strengthening mechanisms: alloying additives respectively heat treatment and the severe plastic deformation [2][3]. The AlSi1MgMn alloy is alloyed from the main elements namely magnesium and silicon. At higher magnesium content tends to increase strength properties of hardened alloy formation of Mg 2 Si phase. Silicon improves mechanical properties by changing the shape of the grain. Except of the main alloying elements, there are added the alloy chromium and manganese which form dispersion particles. These are larger than the other precipitates that can act as nucleation sites for strengthening precipitations, and have good thermal stability, which influences the recovery and recrystallization [4][5][6] Another way of improving the properties of the alloy is heat treatment (consisting of solution treatment, quenching in water, and a natural or artificial ageing treatment). From the

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Application of Workability Test to Spd Processing

Cited by 30 publications

References 3 publications

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

New Approach In The Properties Evaluation Of Ultrafine-Grained OFHC Copper

Physical and Numerical Determination of Workability in Aluminium Alloys

Influence of Heat Treatment on Properties of en Aw 6082 Aluminium Alloy

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