20.500.12556/DKUM-59158 Spremljanje faznih transformacij v jeklih z in-situ meritvami električne upornosti Monitoring of phase transformation in steels with in-situ electric resistance measurements V magistrski nalogi je obravnavana uporabnost neporušne merilne metode sprotnega merjenja električne upornosti med toplotnimi cikli za zasledovanje in karakterizacijo faznih sprememb. Rezultati "In-situ" meritev sprememb električne upornosti so bili primerjani z metealografskimi analizami vzorcev jekel, odvzetimi pred in po meritvah na napravi za sprotno spremljanje procesov. Za večji nabor literature in rezultatov že opravljenih raziskav, je bila metoda najprej preizkušena na komercialnih jeklih. Kasnejši preizkusi so bili opravljeni tudi na novih jeklih, razvitih na Inštitutu za tehnologijo materialov fakultete za strojništvo. Ugotovljeno je bilo, da obstaja dobra korelacija med rezultati "In-situ" meritev električne upornosti in rezultati metalografskih analiz. Na podlagi dobljenih rezultatov lahko sklepamo, da je metoda primerna za sprotno spremljanje mikrostrukturnih sprememb med toplotno obdelavo. Metoda ima tudi svoje prednosti, saj zajema rezultate meritev skozi celotno temperaturno obdelavo ter posledično omogoča boljši vpogled v procese, kjer je te procese težje nadzorovati z uporabo klasičnih metod. In the master thesis the application of nondestructive method, based on continuous electrical resistivity measurement has been applied for monitoring of phase transformations in ferrous alloys. The results of "in-situ" measurements of changes in electrical resistivity were compared with metallographic analysis of steel samples taken before and after thermal cycling. At first the method was tested on steels which are commonly used in industry and have are fairly well known, thus simplifying the interpretation of the results. Later tests were conducted on new steels, developed at the Institute of Materials Technology at the Faculty of mechanical engineering. It has been established that there is a good correlation between the measurements of the electrical resistivity and metallographic analysis. Based on the obtained results we can conclude that the method is suitable for detecting critical temperatures and other processes during heat treatment. It also has advantages since it is applicable to wide variety of testing specimens and enables a better insight into processes, like carbon partitioning, which are difficult to monitor/detect using conventional methods. Fazne transformacije električna upornost nanostrukturno bainitno jeklo Phase transformation electrical resistivity nanostructured bainitic steel true true false [M. Jevšnik] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2016-05-05 23:05:09 2016-06-13 12:14:37 2022-06-19 03:07:07 2019-07-11 11:04:38 2016 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.18:669.15-194.591(043.2) 19765526 URN:SI:UM:DK:77MKRRO6 MAG_Jevsnik_Marcel_2016.pdf MAG_Jevsnik_Marcel_2016.pdf 1 818B2EF60A71AD564FC6CCFD5B89E789 a4e4ba5dd3fdf694e90730941b0a59805c1ad6c8204eb1a90eb26b2def2c6236 acd08100-7c0c-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=94125 Fakulteta za strojništvo 0 0 0