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2 2015

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Impact of rotary swaging and age hardening on mechanical properties of EN AW 2024

Kövér M., Sláma P., Palán J.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 72, nr 2

61--66

Purpose: Invention of severe plastic deformation methods led to increased interest in ultra-fine grained materials. The hardenable aluminium alloys were extensively studied in the last decade. It was revealed that combination of severe plastic deformation and age hardening can significantly improve the material properties of these alloys. In this article we performed such progressive thermo-mechanical treatment and following mechanical testing and metallographic analysis. The aim was to evaluate the influence of this treatment on mechanical properties, mostly the effect of various age hardening temperatures and time. Aluminium alloy EN AW 2024 was chosen for the experimental procedures. Impact of processing parameters on mechanical properties was determined by tensile testing. Metallographic analysis was used for evaluation of the straining influence on grain morphology. In the conclusion we denoted significant strain hardening effect, present shear bands and change in aging kinetics. Design/methodology/approach: The experimental material was processed by progressive thermo-mechanical treatment. The evaluation was performed by simple tensile testing and light microscopy. The first conclusions were derived from determined mechanical properties and based on similarities in available publications with related topic. Findings: The research results roughly confirm the recovery-precipitation complementary effect, observed in other hardenable aluminium alloys or the same hardenable alloy deformed by other SPD technique. The impact of both parts of processing – deformation and age hardening on mechanical properties was evaluated. Research limitations/implications: Future detailed investigation of secondary phase particles and dislocation-precipitate interaction should be performed. This investigation was not performed as it requires transmission electron microscopy. Originality/value: The paper contains first impression on promising SPD technique. As the technique appeared only recently, very few articles were published, considering few light alloys. The paper can help to set parameters for other researchers in this field and promote commercialization of this progressive thermo-mechanical processing

Przeróbka plastyczna prętów tytanowych na druty w procesie wyciskania, kucia rotacyjnego oraz ciągnienia

Księżarek S., Kazana W., Marszowski K., Pachla W.

Hutnik, Wiadomości Hutnicze

2015

Vol. 82, nr 1

72--75

Przeprowadzono próby badawczo doświadczalne, których celem było opracowanie założeń procesowych wytwarzania drutów tytanowych bazując na technologii: wyciskania na prasie hydraulicznej pracującej w systemie KOBO, kucia rotacyjnego oraz ciągnienia. Jako półfabrykat wykorzystano pręty czystego tytanu w gatunku Grade 2. Na bazie wyników uzyskanych w próbach oceny właściwości wytrzymałościowych w temperaturach 20÷600°C zaprojektowana została technologia wyciskania z wykorzystaniem prasy hydraulicznej. Uzyskana prasówka poddawana była w pierwszej kolejności operacji ciągnienia, połączonej z obróbką cieplną, a następnie stosowano efektywniejszy sposób przeróbki plastycznej, polegający na kuciu rotacyjnym prętów uzyskanych podczas wyciskania. Przerabiana w procesie ciągnienia i kucia rotacyjnego prasówka drutowa poddawana była badaniom właściwości mechanicznych oraz mikrostruktury.

Experimental research was carried out aiming to develop a titanium wire manufacturing process based on extrusion on hydraulic press working in the KOBO system, rotary swaging and drawing. As an input material Grade 2 titanium rods were used. On the basis of the results obtained to assess the strength properties at temperatures 20÷600°C extrusion technology has been designed with the use of hydraulic press. Extruded material was subjected to drawing operation combined with heat treatment, and then effective metalworking processing of rotary swaging of extruded rods was applied. Rotary swaged and drawn wires were subject of mechanical properties and microstructure tests.