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undergraduate thesis
Tvrdoća i lomna žilavost nanostrukturiranog tvrdog metala
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. urn:nbn:hr:235:342622
Renić, Božo
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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Renić, B. (2018). Tvrdoća i lomna žilavost nanostrukturiranog tvrdog metala (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:342622

Renić, Božo. "Tvrdoća i lomna žilavost nanostrukturiranog tvrdog metala." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. https://urn.nsk.hr/urn:nbn:hr:235:342622

Renić, Božo. "Tvrdoća i lomna žilavost nanostrukturiranog tvrdog metala." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. https://urn.nsk.hr/urn:nbn:hr:235:342622

Renić, B. (2018). 'Tvrdoća i lomna žilavost nanostrukturiranog tvrdog metala', Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 20 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:342622

Renić B. Tvrdoća i lomna žilavost nanostrukturiranog tvrdog metala [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2018 [cited 2024 December 20] Available at: https://urn.nsk.hr/urn:nbn:hr:235:342622

B. Renić, "Tvrdoća i lomna žilavost nanostrukturiranog tvrdog metala", Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:235:342622

Metadata
TitleTvrdoća i lomna žilavost nanostrukturiranog tvrdog metala
Title (english)Hardness and fracture toughness of nanostructured cemented carbides
AuthorBožo Renić
MentorDanko Ćorić (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2018-03-01, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
U ovom radu opisani su tvrdi metali uz naglasak na njihova mehanička svojstva, mikrostrukturu, primjenu i način proizvodnje. U eksperimentalnom dijelu ispitivane su i analizirane vrijednosti tvrdoće i lomne žilavosti nanostrukturiranih tvrdih metala. Eksperimentalni dio uključivao je provođenje ispitivanja na tri uzorka: s 5% kobalta (WC-5Co), 10% kobalta (WC-10Co) odnosno 15% kobalta (WC-15Co). Tvrdoća je ispitana metodom po Vickersu (HV30) sukladno normi HR EN ISO 6507-1:2005, a lomna žilavost određena je Palmqvistovom metodom sukladno normi ISO 28079:2009. Kod Palmqvistove metode mjerene su duljine pukotina koje propagiraju iz vrhova otiska. Rezultati pokazuju da se s povećanjem udjela kobalta u tvrdom metalu smanjuje tvrdoća, a lomna žilavost povećava. Također ukazuju da se primjenom nanostrukturiranih tvrdih metala, nano veličine zrna, povećava tvrdoća uz neznatnu promjenu lomne žilavosti.
Abstract (english)
In this paper hard metals are described with an emphasis on their mechanical properties, microstructure, application and production method. In the experimental part, the hardness and fracture toughness of nanostructured hard metals were tested and analyzed. The experimental part included tests on three samples: with 5% cobalt (WC-5Co), 10% cobalt (WC-10Co) and 15% cobalt (WC-15Co). The hardness was tested by Vickers method (HV30) according to HR EN ISO 6507-1:2005. and the fracture toughness was determined by the Palmqvist method according to ISO 28079: 2009. Palmqvist's method measures the length of cracks that propagate from the corners of the impression. The results show that with the increase of the cobalt share in the hard metal hardness decreases and the fracture toughness increases. They also indicate that using nano-structured hard metal, nano-sized grains, increases the hardness with a slight change of fracture toughness.
Keywords
Languagecroatian
URN:NBNurn:nbn:hr:235:342622
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 on2019-05-22 21:37:54