20.500.12556/RUL-92659 Preiskava nastajanja vročih razpok pri zlitinah Al-Zn Investigation of the hot tearing formation in Al-Zn alloys Vroče trganje je ena od napak, ki se pojavljajo med ulivanjem aluminijevih zlitin. Poznavanje mehanizmov vročega trganja je zelo pomembno, če želimo proizvajati kvalitetne izdelke iz aluminijevih zlitin. V zaključni nalogi so bili preiskovani mehanizmi vročega trganja v aluminijevih ulitkih. Poudarek je na problemu vročega trganja v AlZn9 zlitinah za uporabo v različnih vejah industrije, vključno z avtomobilsko in vesoljsko. Predstavljen je pregled preizkusov, ki so primerni za preiskovanje vročega pokanja. Določili smo zadnje temperaturno področje strjevanja (angl. Terminal Freezing Range, TFR), v katerem je napajanje že močno ovirano. Izračunano je bilo s pomočjo Scheil – Gulliverovega modela za vse štiri preiskovane zlitine; • AlZn9Mg2,3Cu2,3 • AlZn9Mg2,3Cu2,6 • AlZn9Mg2,6Cu2,3 • AlZn9Mg2,6Cu2,6 Enake zlitine so bile nato ulite v trajno kokilo, ki je bila oblikovana posebej za preiskave vročega pokanja. Ulitki so bili optično ocenjeni. Narejena je bila primerjava med napovedanim in izmerjenim TFR-om. Med eksperimenti smo kontrolirali nastanek vročih razpok. Z instrumentalno kokilo so bili izmerjeni sila, temperature in pomik med strjevanjem. Rezultati so predstavljeni na koncu tega dela. Na koncu so rezultati ovrednoteni in predstavljeni so predlogi za nadaljnje delo. Hot tearing is presented as one of defects, which occurs during casting of aluminium alloys. If we want to cast quality products from aluminium alloys is very important to know causes and mechanisms of hot tearing. In present work, mechanisms of hot tear formation in aluminium castings were studied. The main focus will be on the problem of hot cracking in AlZn9 alloys for applications in various industries, including automotive and aerospace. Overview of experiments, which are suitable for hot tearing investigations is introduced. Terminal freezing range (TFR) is calculated with use of Scheil – Gulliver model for all of the four investigated alloys; • AlZn9Mg2,3Cu2,3 • AlZn9Mg2,3Cu2,6 • AlZn9Mg2,6Cu2,3 • AlZn9Mg2,6Cu2,6 Same alloys were then cast in permanent mould, which was designed for investigation of hot tears. Castings were optically evaluated. Comparison of predicted TFR with TFR from measurements from the experiments was made. Formation of hot cracks was monitored during experiments with instrumented rod mould. Force, temperature and displacement were measured during casting. At the end, results are described and suggestions are presented. vroče trganje aluminijeve zlitine oblikovanje razpok v vročem ulitek hot tearing aluminium alloys hot tear formation casting true false false Slovenski jezik Angleški jezik Diplomsko delo/naloga 2017-06-24 07:15:53 2017-06-24 07:15:54 2022-08-09 23:40:55 0000-00-00 00:00:00 2017 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 50706 155.pdf 155.pdf 1 8641B2D0F341E664BEA10E73DE4AFA02 78e75662ec6134cd40d0835997102c5e26b60f89dcf3b9dcb30150c6780024ee 18f8052f-a1b3-11eb-a523-00155dcfd717 20.500.12556/rul/4d9bab0c-23a6-4674-a06f-5d1eab1ee0d6 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=99444 Naravoslovnotehniška fakulteta 0 0 0