Asymmetric rolling of EN AW-5454 aluminium alloy

Kraner, Jakob (author), Fajfar, Peter (mentor), Palkowski, Heinz (co-mentor)

Rolling is as one of the most commonly used metal forming processes. In industrial practice, symmetric rolling technology is usually used. Nevertheless, it is possible to conduct an asymmetric rolling process. Introducing asymmetry in the rolling process is possible via different means. Asymmetry imparts changes in the technical and in the economical aspect of the rolling process. In the framework of this master thesis, the asymmetric rolling of EN AW-5454 aluminium alloy was investigated. For the planned rolling types, numerical simulations with similar conditions and entry rolling parameters were conducted. Symmetric and asymmetric rolling experiments were performed on a laboratory rolling mill and the exit obtained parameters were compared. The deformed workpieces were heat-treated and annealed. Different mechanical tests were performed on both the heat-treated and the deformed samples to find out the influence of asymmetric rolling on the resulting properties. Tensile, plastic strain ratio and hardness tests were performed respectively. Standard sample preparation procedures were applied to the samples subjects. Investigations of light optical and scanning electron metallography were carried out.

• Language: English
• Keywords: asymmetric rolling, aluminium alloys, mechanical properties
• Work type: Master's thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2018
• PID: 20.500.12556/RUL-103255
• COBISS.SI-ID: 1744991
• Publication date in RUL: 15.09.2018

Secondary language

• Language: Slovenian
• Title: Asimetrično valjanje aluminijeve zlitine EN AW-5454

Abstract

Proces valjanja je eden najpogosteje uporabljenih postopkov preoblikovanja kovinskih materialov. V praksi se najpogosteje uporablja postopek simetričnega valjanja, lahko pa se uporablja tudi postopek asimetričnega valjanja. Asimetrični način valjanja se lahko izvede na več različnih načinov. Na proces valjanja ima asimetrija pozitiven vpliv tako v tehnološkem kot tudi ekonomskem smislu. V okviru magistrske naloge smo raziskovali asimetrično valjanje aluminijeve zlitine EN AW- 5454. Za predvidene načine valjanja smo pri podobnih pogojih in vhodnih parametrih izdelali simulacije valjanja. Na laboratorijskem valjalnem stroju smo izvedli simetrično kot tudi asimetrično valjanje in različne izhodne parametre valjanja primerjali med seboj. Na deformiranih vzorcih smo izvedli toplotno obdelavo. Vzorce smo žarili do mehkega stanja. Na deformiranih kot tudi na toplotno obdelanih vzorcih smo za ugotovitev vpliva asimetričnega valjanja na mehanske lastnosti izvedli več različnih mehanskih preizkusov. Izvedli smo natezni preizkus, test plastične obremenitve in merjenje trdote. Spremembe mehanskih lastnosti smo analizirali s pomočjo metalografije, kjer smo uporabili optični mikroskop (LOM) in vrstični elektronski mikroskop (SEM).

• Keywords: asimetrično valjanje, aluminijeve zlitine, mehanske lastnosti