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master's thesis
Vremenska relaksacija AC susceptibilnosti kod metoda za istraživanje dinamike defekata u željezu i čelicima
Zagreb: University of Zagreb, Faculty of Science, 2018. urn:nbn:hr:217:507558
Matković, Iva
University of Zagreb
Faculty of Science
Department of Physics

Institutional repository: Repository of the Faculty of Science

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Matković, I. (2018). Vremenska relaksacija AC susceptibilnosti kod metoda za istraživanje dinamike defekata u željezu i čelicima (Master's thesis). Zagreb: University of Zagreb, Faculty of Science. Retrieved from https://urn.nsk.hr/urn:nbn:hr:217:507558

Matković, Iva. "Vremenska relaksacija AC susceptibilnosti kod metoda za istraživanje dinamike defekata u željezu i čelicima." Master's thesis, University of Zagreb, Faculty of Science, 2018. https://urn.nsk.hr/urn:nbn:hr:217:507558

Matković, Iva. "Vremenska relaksacija AC susceptibilnosti kod metoda za istraživanje dinamike defekata u željezu i čelicima." Master's thesis, University of Zagreb, Faculty of Science, 2018. https://urn.nsk.hr/urn:nbn:hr:217:507558

Matković, I. (2018). 'Vremenska relaksacija AC susceptibilnosti kod metoda za istraživanje dinamike defekata u željezu i čelicima', Master's thesis, University of Zagreb, Faculty of Science, accessed 19 December 2024, https://urn.nsk.hr/urn:nbn:hr:217:507558

Matković I. Vremenska relaksacija AC susceptibilnosti kod metoda za istraživanje dinamike defekata u željezu i čelicima [Master's thesis]. Zagreb: University of Zagreb, Faculty of Science; 2018 [cited 2024 December 19] Available at: https://urn.nsk.hr/urn:nbn:hr:217:507558

I. Matković, "Vremenska relaksacija AC susceptibilnosti kod metoda za istraživanje dinamike defekata u željezu i čelicima", Master's thesis, University of Zagreb, Faculty of Science, Zagreb, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:217:507558

Metadata
TitleVremenska relaksacija AC susceptibilnosti kod metoda za istraživanje dinamike defekata u željezu i čelicima
Title (english)Time relaxation of AC susceptibility as a method for defect-dynamics research in iron and steels
AuthorIva Matković
MentorMladen Prester (mentor)
MentorŽeljko Skoko (mentor)
Committee memberŽeljko Skoko (predsjednik povjerenstva)
Committee memberMladen Prester (član povjerenstva)
Committee memberDavor Horvatić (član povjerenstva)
Committee memberMirko Planinić (član povjerenstva)
Committee memberDanko Radić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Science
(Department of Physics)
Zagreb
Defense date and country2018-05-16, Croatia
Scientific / art field,
discipline and subdiscipline		NATURAL SCIENCES
Physics
Abstract
Ovaj diplomski rad detaljno istražuje prethodno dobro karakterizirani uzorak čistog alfa-željeza i kvantificira relaksaciju atoma ugljika kao sveprisutnog intersticijskog defekta u željezu,odnosno čelicima. Također istražuje relaksacijske procese u nizu legura pri čemu je željezo supstituirano kromom u različitim koncentracijama, sa ciljem korelacije magnetskih i mehanička svojstva. Istraživanje se temelji na metodi mjerenja vremenske relaksacije AC susceptibilnosti, temeljenoj na feromagnetizmu feritnih čelika i interakciji domenskih zidova s defektima. Spomenuta relaksacija mjeri se u širokom temperaturnom području, a zatim se odgovarajućom numeričkom obradom dolazi do aktivacijske energije dinamike defekata koja predstavlja vrlo važan podatak. Glavni element razvoja takvih čelika je poznavanje vremenske dinamike intrinzičnih strukturnih defekata,te defekata unesenih zračenjem. Motivacija je razvoj čelika s mehaničkim svojstvima koja se u razumnom periodu eksploatacije još održavaju na prihvatljivoj razini kvalitete.Oni nalaze primjenu u konstrukcijskim posudama budućih fuzijskih nuklearnih postrojenja (tokamaka), koji su izloženi uvjetima visoke operativne temperature (do 500 K) i gustog toka 14 MeV-neutrona,te u vremenu degradiraju.Isto se odnosi i na fisijske reaktore nove generacije.
Abstract (english)
This thesis reports investigation of well-characterized alpha-iron samples and quantifies relaxation of interstitial carbon atoms in iron and steel. Investigation of relaxation processes in several alloys, where iron is substituted by chromium in variable concentration, has been also reported. The reported research is based on method of measuring time relaxation of magnetic AC susceptibility, underlined by ferromagnetism of ferritic steels and interaction of domain walls with defects. Relaxation is measured in a wide temperature range, followed by appropriate numeric method to evaluate activation energy for defect dynamics; the latter quantity represents a very important parameter for defect-dynamics characterization. In development of improved structural steels knowledge of time dynamics of intrinsic structural defects, and defects introduced by irradiation, represents a crucial step forward. In particular, motivation is in developing steels possessing superior mechanical properties, which in reasonable period of exploitation remain at the acceptable quality level. Such steels can be applied in the construction vessels of future fusion nuclear facilities (tokamaks), exposed to properties-degrading conditions of high operating temperatures (up to 500 K) and of high flux of high-energy (14 MeV) neutrons. The same motivation applies to the constructive elements of new-generation fission reactors.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:217:507558
Study programmeTitle: Physics and Technology; specializations in: Education
Course: Education
Study programme type: university
Study level: integrated undergraduate and graduate
Academic / professional title: magistar/magistra edukacije fizike i tehnike (magistar/magistra edukacije fizike i tehnike)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2018-06-26 09:21:22