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master's thesis
Usporedba mikrostrukture i svojstava dvaju konstrukcijskih čelika otpornih na trošenje
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. urn:nbn:hr:235:350847
Lukšić, Helena
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

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Lukšić, H. (2021). Usporedba mikrostrukture i svojstava dvaju konstrukcijskih čelika otpornih na trošenje (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:350847

Lukšić, Helena. "Usporedba mikrostrukture i svojstava dvaju konstrukcijskih čelika otpornih na trošenje." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:235:350847

Lukšić, Helena. "Usporedba mikrostrukture i svojstava dvaju konstrukcijskih čelika otpornih na trošenje." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:235:350847

Lukšić, H. (2021). 'Usporedba mikrostrukture i svojstava dvaju konstrukcijskih čelika otpornih na trošenje', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 20 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:350847

Lukšić H. Usporedba mikrostrukture i svojstava dvaju konstrukcijskih čelika otpornih na trošenje [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2021 [cited 2024 December 20] Available at: https://urn.nsk.hr/urn:nbn:hr:235:350847

H. Lukšić, "Usporedba mikrostrukture i svojstava dvaju konstrukcijskih čelika otpornih na trošenje", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:235:350847

Metadata
TitleUsporedba mikrostrukture i svojstava dvaju konstrukcijskih čelika otpornih na trošenje
Title (english)Comparison of microstructure and properties of two wear resistance structural steels
AuthorHelena Lukšić
MentorVera Rede (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2021-12-16, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Cilj ovoga diplomskoga rada bio je odrediti i usporediti mikrostrukturu, tvrdoću i otpornost na abrazijsko trošenje dvaju konstrukcijskih čelika poboljšane otpornosti na abrazijski mehanizam trošenja – čelika Hardox 450 i čelika XAR 450. Ispitivanje otpornosti na abraziju provedeno je standardnom metodom „suhi pijesak – gumeni kotač“ te na uređaju Taber abrader. Oba čelika imaju sličnu homogenu sitnozrnatu martenzitnu mikrostrukturu. Kod obaju čelika dobivene su podjednake vrijednosti tvrdoće HV2 u svim karakterističnim presjecima ploče. Vrijednosti tvrdoća HV0,2 i HV1 nešto su više od vrijednosti tvrdoće HV2, no puno veća su i rasipanja rezultata. Ispitivanje otpornosti na abraziju metodom „suhi pijesak – gumeni kotač“ pokazuje da čelik Hardox 450, u odnosu na čelik XAR 450, ima manji gubitak volumena za oko 8 %, ali rasipanja rezultata kod ovog čelika su puno veća nego kod čelika XAR 450. Pri ispitivanju otpornosti na abraziju na uređaju Taber abrader, oba čelika pokazala su vrlo sličnu otpornost. Također, kod obaju čelika može se uočiti fenomen „kritične veličine abrazivnog zrna“. Kritična veličina abrazivnog zrna slična je kod oba čelika i nalazi se između 21,8 μm i 30,2 μm.
Abstract (english)
The aim of this master's thesis was to determine and compare microstructure, hardness and resistance to abrasion wear of two structural steels of improved resistance to the abrasion wear mechanism – the Hardox 450 steel and the XAR 450 steel. The abrasion resistance test was carried out using the standard "dry sand – rubber wheel" method and on the Taber abrader. Both steels have a similar homogeneous fine-grained martensitic microstructure. In both steels, equal values of HV2 hardness were obtained in all characteristic sections of the plate. The hardness values of HV0.2 and HV1 were slightly higher than the value of HV2 hardness, but the scattering of results was much higher. Abrasion resistance testing using the "dry sand - rubber wheel" method shows that the Hardox 450 steel, compared to the XAR 450 steel, has a lower volume loss of about 8 %, but the scattering of results in this steel was much higher than in steel XAR 450. When testing abrasive wear resistance on the Taber abrader, both steels showed very similar resistance. Also, in both steels, the phenomenon of "critical size of abrasive grain" can be observed. The critical size of the abrasive grain is similar in both steels and is located between 21.8 μm and 30.2 μm.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:350847
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2021-12-13 20:07:03