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undergraduate thesis
Karakterizacija zavarenog spoja nehrđajućeg martenzitnog čelika
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2024. urn:nbn:hr:235:927711
Planinčić, Valentina
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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Planinčić, V. (2024). Karakterizacija zavarenog spoja nehrđajućeg martenzitnog čelika (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:927711

Planinčić, Valentina. "Karakterizacija zavarenog spoja nehrđajućeg martenzitnog čelika." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2024. https://urn.nsk.hr/urn:nbn:hr:235:927711

Planinčić, Valentina. "Karakterizacija zavarenog spoja nehrđajućeg martenzitnog čelika." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2024. https://urn.nsk.hr/urn:nbn:hr:235:927711

Planinčić, V. (2024). 'Karakterizacija zavarenog spoja nehrđajućeg martenzitnog čelika', Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 20 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:927711

Planinčić V. Karakterizacija zavarenog spoja nehrđajućeg martenzitnog čelika [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2024 [cited 2024 December 20] Available at: https://urn.nsk.hr/urn:nbn:hr:235:927711

V. Planinčić, "Karakterizacija zavarenog spoja nehrđajućeg martenzitnog čelika", Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2024. Available at: https://urn.nsk.hr/urn:nbn:hr:235:927711

Metadata
TitleKarakterizacija zavarenog spoja nehrđajućeg martenzitnog čelika
AuthorValentina Planinčić
MentorVera Rede (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2024-02-28, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
U završnom radu provedena je karakterizacija zavarenog spoja martenzitnog nehrđajućeg čelika X3CrNiMo13-4. U teorijskom dijelu rada opisane su osnovne vrste nehrđajućih čelika s posebnim naglaskom na martenzitne nehrđajuće čelike, zavarljivost, toplinska obrada te mikrostrukturne promjene ovih čelika. U eksperimentalnom dijelu analizirana je makrostruktura i mikrostruktura te ispitana različita mehanička svojstva zavarenog spoja na ploči debljine 50 mm, isporučene u normaliziranom stanju. Provedena analiza strukture pokazala je da zavar ima pravilnu geometriju i jasno istaknute prolaze. Osnovni materijal ima sitnozrnatu usmjerenu mikrostrukturu, sastavljenu od ferita i vrlo sitnih karbida. U zoni utjecaja topline mikrostruktura je martenzitna, a metal zavara ima tipičnu ljevačku strukturu. Mikrostrukturne promjene u zavarenom spoju utjecale su na povećanje tvrdoće u odnosu na osnovni materijal, a najviše vrijednosti tvrdoće izmjerene su u metalu zavara. U zoni utjecaja topline izmjerene su više vrijednosti žilavosti nego u metalu zavara. U području zavarenog spoja izmjerena je viša vlačna čvrstoća od zajamčene vrijednosti vlačne čvrstoće za osnovni materijal. Pri savojnom ispitivanju na kritičnoj površini lica i korijena zavara nisu uočene pukotine. Dobiveni rezultati potvrđuju zadovoljavajuću kvalitetu zavarenog spoja.
Abstract (english)
The final thesis included the characterization of the welded joint of martensitic stainless steel X3CrNiMo13-4. The theoretical part of the thesis describes the basic types of stainless steels, with a particular focus on martensitic stainless steels, weldability, heat treatment, and microstructural changes in these steels. In the experimental part, the macrostructure and microstructure were analyzed, and various mechanical properties of the welded joint on a 50 mm thick plate delivered in a normalized state were examined. The structural analysis showed that the weld has a regular geometry and clearly defined passes. The base material has a fine-grained directional microstructure composed of ferrite and very fine carbides. In the heat-affected zone, the microstructure is martensitic, and the weld metal has a typical casting structure. Microstructural changes in the welded joint led to an increase in hardness compared to the base material, with the highest hardness values measured in the weld metal. In the heat-affected zone, higher toughness values were measured than in the weld metal. In the welded joint area, a higher tensile strength was measured compared to the guaranteed tensile strength value for the base material. No cracks were observed during bending tests on the critical surface of the weld face and root. The obtained results confirm the satisfactory quality of the welded joint.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:927711
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2024-02-27 12:05:37