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master's thesis
Procjena dubine prokaljivanja strojnog dijela MJ.22-DP.42
Rijeka: University of Rijeka, Faculty of Engineering, 2023. urn:nbn:hr:190:182297
Jurić, Mario
University of Rijeka
Faculty of Engineering
Department of Materials Science and Engineering

Institutional repository: Repository of the University of Rijeka, Faculty of Engineering

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Jurić, M. (2023). Procjena dubine prokaljivanja strojnog dijela MJ.22-DP.42 (Master's thesis). Rijeka: University of Rijeka, Faculty of Engineering. Retrieved from https://urn.nsk.hr/urn:nbn:hr:190:182297

Jurić, Mario. "Procjena dubine prokaljivanja strojnog dijela MJ.22-DP.42." Master's thesis, University of Rijeka, Faculty of Engineering, 2023. https://urn.nsk.hr/urn:nbn:hr:190:182297

Jurić, Mario. "Procjena dubine prokaljivanja strojnog dijela MJ.22-DP.42." Master's thesis, University of Rijeka, Faculty of Engineering, 2023. https://urn.nsk.hr/urn:nbn:hr:190:182297

Jurić, M. (2023). 'Procjena dubine prokaljivanja strojnog dijela MJ.22-DP.42', Master's thesis, University of Rijeka, Faculty of Engineering, accessed 05 May 2024, https://urn.nsk.hr/urn:nbn:hr:190:182297

Jurić M. Procjena dubine prokaljivanja strojnog dijela MJ.22-DP.42 [Master's thesis]. Rijeka: University of Rijeka, Faculty of Engineering; 2023 [cited 2024 May 05] Available at: https://urn.nsk.hr/urn:nbn:hr:190:182297

M. Jurić, "Procjena dubine prokaljivanja strojnog dijela MJ.22-DP.42", Master's thesis, University of Rijeka, Faculty of Engineering, Rijeka, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:190:182297

Metadata
TitleProcjena dubine prokaljivanja strojnog dijela MJ.22-DP.42
Title (english)Estimation of hardening depth of workpiece MJ.22-DP.42
AuthorMario Jurić
MentorDario Iljkić (mentor)
Committee memberIgor Bonefačić (predsjednik povjerenstva)
Committee memberGoran Cukor (član povjerenstva)
Committee memberDario Iljkić (član povjerenstva)
GranterUniversity of Rijeka
Faculty of Engineering
(Department of Materials Science and Engineering)
Rijeka
Defense date and country2023-05-25, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Tema i zadatak ovog diplomskog rada bila je procijeniti dubinu prokaljivanja strojnog dijela MJ.22-DP.42 prema normi HRN EN ISO 642. Kako bi se sama prokaljivost uspješno procijenila, najprije je bilo potrebno upoznati se sa terminima čelika, prokaljivosti i samog postupka kaljenja. Tako su u prvom dijelu diplomskog rada teorijski objašnjeni pojmovi čelika te njegova karakterizacija, općenita svojstva te na koji način se ta svojstva mogu mijenjati. U trećem poglavlju opisana je mikrostrukturna pretvorba čelika pri toplinskoj obradi, pripadajući Fe-Fe3C dijagram stanja, mikrostrukturni sastojci čelika te načini i uvjeti njihove pretvorbe, te je na samom kraju detaljno opisan i TTT-dijagram. Nakon toga je u četvrtom poglavlju detaljno objašnjen postupak toplinske obrade kaljenja budući da će se koristiti u praktičnom dijelu te pojam prokaljivosti čelika. Potom su opisane i moguće metode procjene prokaljivosti čelika, najčešće korištene, Grossmannova i Jominy metoda. Budući da se koristi u praktičnom dijelu, Jominy metoda je u nastavku detaljnije opisana. Nakon teorijskog dijela slijedi praktični dio diplomskog rada u kojemu se ispituje, odnosno vrši postupak same procjene dubine prokaljivanja zadanog strojnog komada koristeći Jominyevu metodu i Crafts-Lamontove dijagrame. Pomoću njih se potom dobiju konačne U-krivulje za različite intenzitete gašenja H, koje opisuju tok tvrdoće po presjeku zadanog strojnog dijela za slučaj gašenja strojnog dijela u ulju i vodi. Detaljno je opisan svaki korak proveden u postupku te su prikazani konačni rezultati.
Abstract (english)
The topic and task of this master thesis was estimation of hardening depth of workpiece MJ.22-DP.42 according to the HRN EN ISO 642 standard. In order to successfully estimate the hardenability itself, first it was necessary to become familiar with the concepts of the steel, the hardenability and the hardening process. In the first part of the master thesis, the concepts of steel and it's characterization, general properties and how these properties can be changed are theoretically explained. Third chapter describes the microstructural transformation and TTT-diagram in detail. In the fourth chapter, the process of heat treatment of hardening is explained in detail since it is used in practical part of master thesis, and concept of hardenability of steel as well. Then the possible methods for estimation of the hardenability of steel are described, the most commonly used, the Grossmann and Jominy methods. Since it is used in the practical part, Jominy method is described in more detail. The theoretical part is followed by the practical part of master thesis, in which the process of estimation of hardening depth of given workpiece is preformed by using Jominy method and Crafts-Lamonts diagrams in order to obtain the final U-curves for different quench intensity H. U-curves describes the flow of hardness across the section of the given workpiece for both quenching cases (water and oil). Each step in the procedure is described in detail and the final results are presented.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:190:182297
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 Attribution 4.0 International (CC BY 4.0) icon
Created on2023-05-23 10:53:22