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Preoblikovanje aluminijeve pločevine v območju kriogenih temperatur
ID Blažek, Luka (Author), ID Pepelnjak, Tomaž (Mentor) More about this mentor... This link opens in a new window

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Abstract
V industriji se pogosto pojavi želja po izboljšanih preoblikovalnih lastnostih aluminijeve zlitine. Kot možna rešitev se je izkazala metoda preoblikovanja aluminijevih zlitin v območju kriogenih temperatur. Slednjo metodo smo preizkusili na aluminijevi zlitini kakovosti AW-5754, kjer smo sprva napravili enoosni natezni preizkus standardnih pločevinskih vzorcev pri sobni temperaturi. Z izvajanjem enoosnih preizkusov na vzorcih, kateri so bili izrezani v različnih smereh glede na smer valjanja pločevine, smo zajeli vpliv mehanske anizotropnosti. Med preizkusom pri sobni temperaturi se opazi tudi pojav Portevin-Le Chatelierevega efekta. Za izvedbo nateznega preizkusa v kriogenem stanju je bilo treba izdelati ustrezno hladilno komoro, v kateri je bilo preizkušance mogoče ustrezno podhladiti in sočasno opazovati potek preizkusa. Rezultat nateznega preizkusa v območju kriogenih temperatur je pokazal 72-% povišanje natezne trdnosti, 2,5-krat večji raztezek, povišanje vrednosti mehanske anizotropije in odpravo Portevin-Le Chatelierevega efekta.

Language:Slovenian
Keywords:kriogeno preoblikovanje, natezni preizkus, tekoči dušik, Portevin-Le Chatelierev efekt, preoblikovalnost, kriogena komora, zasnova hladilnega okolja
Work type:Master's thesis/paper
Organization:FS - Faculty of Mechanical Engineering
Year:2024
PID:20.500.12556/RUL-158823 This link opens in a new window
Publication date in RUL:21.06.2024
Views:36
Downloads:15
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Secondary language

Language:English
Title:Forming of aluminum sheet metal in the cryogenic temperature range
Abstract:
In industry, there is often a desire for improved formability of aluminum alloy. The method of transforming aluminum alloys in the cryogenic temperature range proved to be a possible solution. The latter method was tested on aluminum alloy quality AW-5754, where we initially performed a uniaxial tensile test of standard sheet metal samples at room temperature. By performing uniaxial tests on samples that were cut in different directions relative to the sheet rolling direction, we captured the influence of mechanical anisotropy. During the test at room temperature, the appearance of the Portevin-Le Chatelier effect is also observed. In order to carry out the tensile test in cryogenic state, it was necessary to build a suitable cooling chamber in which the test subjects could be adequately cooled and observed at the same time. The result of the tensile test in the cryogenic temperature range showed a 72% increase in tensile strength, 2.5 times greater elongation, an increase in the value of mechanical anisotropy and elimination of the Portevin-Le Chatelier effect.

Keywords:cryogenic transformation, tensile test, liquid nitrogen, Portevin-Le Chatelier effect, transformability, cryogenic chamber, design of the cooling environment

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