20.500.12556/RUL-148723 Analiza lomnih površin obločno navarjene aluminijeve zlitine AlSi5 Analysis of fracture surfaces of WAAM alloy AlSi5 Naloga primerja karakteristiko lomnih površin pri nateznem in udarnem lomu materiala, glede na smer oblikovno obločnega navarjanja žice aluminijeve zlitine - AlSi5. Uporabljeni vzorci so bili izrezani iz navarjene stene in nato obremenjeni vzporedno oziroma pravokotno na smer navarjenih plasti. SEM (angl. SEM - scanning electron microscope) analizo lomnih površin smo izvedli z elektronskim vrstičnim mikroskopom visoke globinske ostrine. Pri analizi smo preverjali mikrostrukturne značilnosti prelomne površine. Rezultati analize so potrdili žilavi prelom materiala neodvisno od tipa preizkusa in orientacije preizkušanca glede na smer izgradnje izdelka. Bistvenih razlik med vzorci izrezanih vzporedno in pravokotno na dodajalne plasti ni bilo zaznati. Ostala opažanja med posameznimi vzorci so, da smo pri vzorcih lomljenih z udarnim preizkusom zaznali 200% višjo pogostost in 164% večji premer plinske poroznost kot pri vzorcih izdelanih za natezni preizkus. Povprečni premer plinskih por na prelomnih površinah je po izvedenem nateznem preizkusu znašal 39,49 ± 13,12 µm, po udarnem preizkusu pa 65,00 ± 22,41 µm. Razlika je posledica različnega načina izdelave preizkušancev ter izvedbe samega testa. Za izdelavo stene, iz katere so bili izrezani preizkušanci na udarni preizkus, so se za doseganje potrebne širine preizkušanca uporabili polnilni vari, ki so v vzorec vnesli višjo količino nečistoč in povečali izpostavljenost vara atmosferi. This document compares the fracture surface characteristics of tensile and impact fractures in a material, based on the direction of wire arc additive manufactured aluminum alloy wire - AlSi5. The specimens used were cut from a welded wall and subsequently loaded parallel and perpendicular to the direction of the welded layers, respectively. Scanning electron microscope (SEM) analysis of the fracture surfaces was conducted using a high depth of field scanning electron microscope. The microstructural characteristics of the fracture surfaces were examined. The analysis results affirmed the toughness of the fractured material, regardless of the test type or the orientation of the test piece concerning the build direction of the product. No significant differences were observed between specimens cut parallel and perpendicular to the welding layers. Additional observations among individual specimens reveal that specimens fractured by impact testing exhibited a 200% higher frequency and 164% larger diameter of gas pores compared to specimens fractured by tensile testing. Consequently, the average diameter of gas pores on the fractured surfaces measured 39.49 ± 13.12 µm after the tensile test and 65.00 ± 22.41 µm after the impact test. This discrepancy can be attributed to the distinct manner in which the test specimens were manufactured and tested. The wall from which the impact test specimens were extracted utilized filler welds to attain the necessary specimen width, which led to a greater introduction of impurities into the specimen and heightened exposure of the weld to the atmosphere. WAAM obločno navarjenje SEM analiza AlSi5 kovinski prelomi natezni test udarni test WAAM Arc welding SEM analysis AlSi5 metal fractures tensile test impact test true false false [G. Klenovšek] Slovenski jezik Angleški jezik Zaključna naloga 2023-08-30 08:30:42 2023-08-30 08:30:44 2023-10-13 08:38:50 0000-00-00 00:00:00 2023 0 Ljubljana 0 XI, 37 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.75:669.715:539.42(043.2) 255243 163397379 29333.pdf 29333.pdf 1 00F141069A33DC4F42CF57CD0EDF474B 71d091f915f09c32a63432f602606aef2234a2d925905dea2b67f3d4a0fa5da5 bdc6fa92-46fe-11ee-a605-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=173062 Fakulteta za strojništvo 0 0 0