20.500.12556/RUL-130236 Določevanje kvalitete zlitine FeSiMg25 diplomsko delo Determination of FeSiMg25 alloy quality diploma work Namen diplomskega dela je iskanje dodatne metode za določanje kvalitete zlitine FeSiMg kot nodulatorja. Izbrali smo dva po kemijski analizi primerljiva materiala in s pomočjo optične in elektronske mikroskopije iskali morebitne razlike, ki jih z uveljavljenimi postopki vhodne kontrole v podjetju WIRE d.o.o. še ne moremo zaznati. Na osnovi izkušenj zaposlenih, rezultatov primerjav naših in konkurenčnih izdelkov (nodulatorjev v obliki žice) ter razlikami v izkoristku med našimi žicami kjer so bila uporabljena primerljiva polnila različnih dobaviteljev, je bila postavljena hipoteza o vplivu mikrostrukture na končni izkoristek. Hipoteza o vplivu homogenosti razporeditve faz na kvaliteto zlitine kot polnila žice skuša podati enovit podatek o skupnem vplivu vseh mešalnih, livnih in drobilnih parametrov, ki so prisotni pri proizvodnji polnila. Zaradi pomembnosti ustrezne sejalne analize in njene morebitne korekcije, smo vzorce obeh materialov sejali na različne velikostne razrede. Priprava metalografskih vzorcev in optična ter elektronska mikroskopija so bile izvedene na Univerzitetnem centru za elektronsko mikroskopijo (UCEM) na Univerzi v Mariboru. Naredili smo metalografske posnetke, izvedli identifikacijo faz in določevali stopnjo homogenosti. Materiala sta izkazovala bistveno razliko v stopnji homogenosti, opažena pa je bila tudi jasna odvisnost homogenosti od velikostnega razreda delcev znotraj posameznega materiala. Ugotovitve diplomske naloge bodo preizkušene na bodočih testih v livarnah kjer izdelujejo nodularno litino s postopkom nodulacije z žico. The aim of this thesis is to find an additional method to determine the quality of FeSiMg alloy as nodulating agent. We have selected two materials comparable by chemical analysis and with the help of optical and electronic microscopy we have searched for possible differences, which we are not yet able to perceive with the established methods of incoming inspection in the company WIRE d.o.o. Based on the experience of the employees, the results of the comparisons of our and competing wires and the differences in the efficiency of our wires using comparable fillers from different suppliers, a hypothesis was made about the influence of the microstructure on the final efficiency. The hypothesis of the influence of the homogeneity of the phase distribution on the quality of the alloy as a wire filler attempts to present uniformly the total influence of all mixing, casting and crushing parameters present in the filler production. Due to the importance of correct sieve analysis and its possible correction, samples of both materials were sieved into different size classes. The preparation of metallographic samples and optical and electronic microscopy were performed at University Center for Electron Microscopy (UCEM) at the University of Maribor. Metallographic images were taken, phase identification was performed and the degree of homogeneity was determined. The two materials showed a significant difference in the degree of homogeneity, and a clear dependence of homogeneity on particle size class within each material was also found. The results of the thesis will be verified in future trials in foundries producing ductile iron using a wire nodule process. nodularna litina nodulator metalografija fazna homogenost ductile iron nodulizing agent metallography phase homogeneity true false false [N. Rom] Slovenski jezik Angleški jezik Višješolska diplomska naloga 2021-09-11 09:00:24 2021-09-11 09:00:25 2022-09-09 04:15:28 0000-00-00 00:00:00 2021 0 Ljubljana 0 Ljubljana XII, 43 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 81463 84836355 8826.pdf 8826.pdf 1 2B60F2591BA1B6245F0D4A65D81F099F 87efd2e86fe582495542389d1d96bd93e040413e9c95d9a4524a6c7ef00e88f5 b0a4034b-12cd-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=147303 Naravoslovnotehniška fakulteta 0 0 0