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doctoral thesis
Utjecaj brzine hlađenja na tvrdoću i žilavost mikrolegiranih čelika
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2005. urn:nbn:hr:235:604414
Dunđer, Marko
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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Dunđer, M. (2005). Utjecaj brzine hlađenja na tvrdoću i žilavost mikrolegiranih čelika (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:604414

Dunđer, Marko. "Utjecaj brzine hlađenja na tvrdoću i žilavost mikrolegiranih čelika." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2005. https://urn.nsk.hr/urn:nbn:hr:235:604414

Dunđer, Marko. "Utjecaj brzine hlađenja na tvrdoću i žilavost mikrolegiranih čelika." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2005. https://urn.nsk.hr/urn:nbn:hr:235:604414

Dunđer, M. (2005). 'Utjecaj brzine hlađenja na tvrdoću i žilavost mikrolegiranih čelika', Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 25 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:604414

Dunđer M. Utjecaj brzine hlađenja na tvrdoću i žilavost mikrolegiranih čelika [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2005 [cited 2024 December 25] Available at: https://urn.nsk.hr/urn:nbn:hr:235:604414

M. Dunđer, "Utjecaj brzine hlađenja na tvrdoću i žilavost mikrolegiranih čelika", Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2005. Available at: https://urn.nsk.hr/urn:nbn:hr:235:604414

Metadata
TitleUtjecaj brzine hlađenja na tvrdoću i žilavost mikrolegiranih čelika
Title (english)Influence of cooling rate on hardness and toughness of micro alloyed steels
AuthorMarko Dunđer
MentorSlobodan Kralj (mentor)
Committee memberVinko Ivušić (predsjednik povjerenstva)
Committee memberSlobodan Kralj (član povjerenstva)
Committee memberNikša Krnić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2005-05-10, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Universal decimal classification
(UDC)		621 - Mechanical engineering. Nuclear technology. Machinery
669 - Metallurgy
Abstract
U radu se obrazlaže usporedba simulacije toplinskog ciklusa zavarivanja s realnim ciklusom zavarivanja. U teorijskom dijelu istraživanja u okviru ovog rada istražen je utjecaj temperaturnih polja na transformaciju mikrostrukture i na mehanička svojstva zavarenog spoja. U eksperimentalnom dijelu ispitivana je tvrdoća i udarna radnja loma na različitim položajima u zoni utjecaja topline unutar cjelovitog zavara. \Napravljena je fraktografska analiza karakterističnih prijeloma i ispitivanje na elektronskom scanning-mikroskopu koja se koristila za ocjenu karakterističnih prijeloma, odnosno ocjene da li se radi o interkristalnom, transkristalnom ili žilavom lomu. Pri ispitivanjima se koristio mikrolegirani čelik povišene čvrstoće TStE 420, a simulacija je provedena na simulatoru toplinskog ciklusa TCS 1405 SMITWELD. Provedena istraživanja su potvrdila polaznu hipotezu ovog rada - primjenom simulacije toplinskog ciklusa zavarivanja i odgovarajućim ispitivanjima na cikliranim uzorcima moguće je ubrzati i skratiti opseg trajanja aktivnosti kod izbora parametara zavarivanja. Također je utvrđeno da svako višeprolazno zavarivanje koje se prakticira u realnim zavarima ima niže vrijednosti tvrdoće i više vrijednosti udarne radnje loma u odnosu na simulirane uzorke. Na kraju su predloženi optimalni parametri pri MAGpostupku zavarivanja ovog čelika.
Abstract (english)
This paper explains comparison between welding thermal cycle simulation and real welding cycle. In the theoretical part of the investigations provided in this paper, the influence of temperature fields' distribution on transformation of microstructure and weld joint mechanical properties was investigated. In experimental part of this paper the investigations of hardness and toughness in different locations of heat-affected zone of complete welded joint were performed. The fractographic analysis on scanning microscope of specific broken specimens was used for fracture type evaluation to determine intergranular, transgranular or ductile fracture. The micro alloyed steel TStE 420 was used for experimental investigations and welding thermal cycle simulation was performed on thermal cycle simulator TCS 1405 SMITWELD. The investigations performed in this work confirmed start hypothesis of this work, i.e. by the application of thermal simulation of welding cycle it is possible to accelerate and shorten duration of activities at welding parameters selection. Beside that, it was determined that multipass welding which is often used in real welding had lower hardness and higher toughness values in relationship to simulated specimens. Finally, the optimal welding parameters for MAG welding of this steel were proposed.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:604414
Study programmeTitle: Mechanical Engineering and Naval Architecture
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2021-02-03 10:15:59