20.500.12556/RUL-162039 Vpliv nanosa trde prevleke na mehanske, toplotne in mikrostrukturne lastnosti jekel diplomsko delo Influence of hard coating deposition on mechanical, thermal and microstructuralproperties of steel diploma work Prevleka TiAlN se že vrsto let uporablja za podaljšanje življenjske dobe in izboljšanje zmogljivosti rezalnih orodij. Na orodja jo nanašamo s PVD-postopkom, kar poteka več ur pri temperaturah okoli 450 °C. Zato morajo biti orodja, na katera se nanaša prevleka, temperaturno obstojna nad to temperaturo. V okviru diplomske naloge smo raziskovali vpliv nanosa prevleke TiAlN na jeklo. V prvem delu smo pripravili in karakterizirali vzorce iz treh različnih jekel, na katera smo kasneje nanašali prevleko TiAlN s PVD-postopkom. Pred nanosom prevleke smo vzorce ustrezno spolirali in očistili. Za jeklo D2 smo imeli v komori za nanašanje prevleke pripravljene dodatne vzorce, prekrite z aluminijasto folijo. Na ta način smo ugotovili, ali pride v komori za nanašanje prevlek do takšnih lokalnih razmer, da se jeklu spremenijo mikrostrukturne lastnosti in posledično pade trdota. Po končanem nanosu smo na vzorcih opravili meritve nanotrdote s postopki instrumentalnega vtiskovanja, mikrotrdote z Vickersovim merilnikom in makrotrdote z Rockwellovim merilnikom. Na vseh vzorcih smo opravili optično mikroskopijo s konfokalnim optičnim mikroskopom in konstruirali topografijo podlage. Rezultate smo nato primerjali med seboj in opazovali, ali imajo različne podlage vpliv na kakovost prevleke in kako se spreminjajo mikrostrukturne in mehanske lastnosti jekla D2 med nanosom prevleke. TiAlN coating has been used for many years to extend the lifetime and improve the performance of cutting tools. It is applied using the PVD process which takes several hours at temperatures of around 450 °C. Therefore, the tools on which the coating is applied must be temperature resistant above this temperature. As part of the diploma work, we investigated the effect of TiAlN coating on steel. In the first part, we prepared and characterized samples from three different steels, on which we later deposited TiAlN coating using the PVD process. Before applying the coating, the samples were properly polished and cleaned. For D2 steel we prepared additional samples covered with aluminium foil. This way, we found out whether such local conditions occur in the deposition chamber that the microstructural properties of steel change and subsequently decrease its hardness. After the coating deposition was completed, we measured the nanohardness using instrumental indentation, microhardness using the Vickers test, and macrohardness using the Rockwell test. Optical microscopy was performed on all samples with a confocal optical microscope and the topography of the substrate was constructed. The results were then compared with each other, and we observed whether different substrates affect the quality of the coating, and how the D2 steel changes during the deposition of the coating. TiAlN PVD trdota mikrostruktura podlaga temperatura TiAlN PVD hardness microstructure substrate temperature true false false T. Hribar Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-09-18 09:01:20 2024-09-18 09:01:25 2024-10-18 09:36:25 0000-00-00 00:00:00 2024 0 Ljubljana 0 Ljubljana XI, 38 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 669 101475 212049155 23011.pdf 23011.pdf 1 95E6FF5CE8D91E2170A46BF793FB4662 ed872d7a6d2e089cd86192e2b9f78fa16b8da242aa756d780d76b40f26ddfb3b b73259a2-758b-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=191052 Naravoslovnotehniška fakulteta 0 0 0