magistrsko delo
Marcel Jevšnik (Author), Mihael Brunčko (Mentor), Ivan Anžel (Co-mentor)

Abstract

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.

Keywords

fazne transformacije;električna upornost;nanostrukturno binitno jeklo;magistrske naloge;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [M. Jevšnik]
UDC: 620.18:669.15-194.591(043.2)
COBISS: 19765526 Link will open in a new window
Views: 758
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Other data

Secondary language: English
Secondary title: Monitoring of phase transformation in steels with in-situ electric resistance measurements
Secondary abstract: 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.
Secondary keywords: phase transformation;electrical resistivity;nanostructured bainitic steel;
URN: URN:SI:UM:
Type (COBISS): Master's thesis/paper
Thesis comment: Univ. v Mariboru, Fak. za strojništvo
Pages: XIII, 62 f.
ID: 9140799