20.500.12556/RUL-113498 Trdnostne lastnosti kovaško varjenega jekla Strength characteristics of metal welded steel Namen diplomskega dela je bil izdelati damaščansko kompozitno jeklo ter ga skovati v vzorce primerne za mehanske preizkuse. V diplomskem delu smo kovaško zvarili damaščansko jeklo iz jekel 15N20 in S235JR. Na pripravljenih vzorcih smo opravili udarni test žilavosti, upogibni preizkus, test trdote ter preučili mikrostrukturo. Vzorci so imeli različno število plasti in bili različno toplotno obdelani. Vzorci so bili kaljeni v olju, kaljeni v dveh sredstvih ter kaljeni v olju in popuščani v peči. Ugotovili smo, da trdota narašča s povečevanjem hitrosti ohlajanja in ne s številom slojev. Največji upogibni raztezek smo dosegli na vzorcu kaljenem v olju in na zraku ter ugotovili, da se vrednosti upogibnega raztezka zmanjšujejo z naraščanjem števila slojev kompozita. The purpose of diploma thesis is to forge damascus composit steel and forge it into samples for mechanical tests. In my thesis we forge welded damascus steel from 15N20 and S235JR steels. On prepared samples we did Charpy impact test, deflection test, hardness test and studied the microstructure. The samples had different number of layers and were differently heat treated. They were quenched in oil, quenched in oil and air and some were quenched in oil and then tempered in furnace to release internal stresses. We figured out that the speed of heat treatment has the biggest influence on hardness. The highest value of deflection appeared when we heat treated the sample in oil and air. Deflection was decreasing when we increased the number of layers of composit. maloogljično jeklo evtektoidno jeklo kovaško varjenje trdota udarna žilavost mikrostruktura low carbon steel evtectoid steel forge welding hardness impact toughness microstructure true false false [R. Žos] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2020-01-11 07:45:37 2020-01-11 07:45:39 2023-11-17 12:56:22 0000-00-00 00:00:00 2020 0 Ljubljana 0 XVIII, 45 str. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 621.791.42:669.14:539.4(043.2) 219896 17030939 4791.pdf 4791.pdf 1 632DF032EA3EBD04621D8F5C0B1943E0 30fe34e7584b7d4165a2634c21ee51dd1d988d34688adf20dd3971c256c9b825 1e41b283-a1b8-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=125588 Fakulteta za strojništvo 0 0 0