Slabljenje učinka obrade taline na razvoj mikrostrukture i mehanička svojstva AlSi12 legure

master's thesis

• Title (english): Melt treatment fading influence on the development of microstructure and mechanical properties of AlSi12 alloy
• Author: Matea Sekulić
• Mentor: Zdenka Zovko Brodarac (mentor)
• Committee member: Natalija Dolić (predsjednik povjerenstva)
• Committee member: Zdenka Zovko Brodarac (član povjerenstva)
• Committee member: Ivan Jandrlić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Metallurgy; Sisak
• Defense date and country: 2021-09-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Metallurgy

Abstract

Aluminijske legure zbog povoljnog omjera mehaničkih, fizikalno-kemijskih i
tehnoloških svojstava pronalaze primjenu u gotovo svim industrijskim granama. Na
mehanička svojstva aluminijskih legura utječu parametri poput veličine i oblika zrna, veličine
i raspodjele primarnih i sekundarnih faza, udaljenosti između dendritnih grana te veličine i
raspodjele uključaka. Odabirom adekvatnog kemijskog sastava dodatkom glavnih i sporednih
legirajućih elemenata, elemenata koji utječu na razvoj mikrostrukture te prisutnih nečistoća
postiže se fina sitnozrnata struktura, dok se metalurškom obradom taline utroskivanjem,
cijepljenjem, otplinjavanjem i modifikacijom osigurava učinkovito izlučivanje eutektika (α-Al
+ β-Si) vlaknaste morfologije.
Cilj ovog rada je utvrditi utjecaj vremena zadržavanja taline na slabljenje učinka
cjepiva i modifikatora te razvoj mikrostrukture i mehaničkih svojstava ljevačke AlSi12 legure
za proizvodnju gravitacijski lijevanih zateznih stezaljki tvrtke Dalekovod d.o.o. Vrijeme
zadržavanja taline značajno utječe na učinkovitost tehnološke obrade taline, odnosno na
djelovanje cjepiva i modifikatora. Istraživanje se temelji na hipotezi da će vrijeme
zadržavanja taline utjecati na slabljenje učinka obrade taline, odnosno da će negativno utjecati
na razvoj mikrostrukture i mehaničkih svojstava legure

Abstract (english)

Aluminum alloys are used in almost all branches of industry because of their favorable
ratio of mechanical, physico-chemical and technological properties. The mechanical
properties of aluminum alloys are influenced by parameters such as size and shape of the
grain, size and distribution of primary and secondary phases, distance between dendrite
branches, and size and distribution of inclusions. By selection of adequate chemical
compostion by the addition of major and minor alloying elements, elements influencing the
development of microstructure, and present impurities, while metallurgical melt treatment by
fluxing, grain refinement, degassing and modification provides effective solidification of
eutectic (α-Al + β-Si) fibrous morphology.
The aim of this paper is to determine the influence of retention time of the melt on the
fading of the effect of the grain refining elements and modificators, and development of
microstructure and mechanical properties of casting AlSi12 alloy for gravitational casting of
tension clamps from the company Dalekovod d.o.o. Retention time of the melt has significant
influence on the efficiency of metallurgical melt treatment, that is the impact of the grain
refining elements and modificators. The research is based on the hypothesis that the retention
time of the melt will influence the fading of the melt treatment, that is it will negatively affect
the development of microstructure and mechanical properties.

• Keywords: AlSi12 legura; metalurška obrada taline; modifikacija eutektika (α-Al + β-Si); cijepljenje
• Keywords (english): AlSi alloy; metallurgical melt treatment; modification of eutectic (α-Al + β- Si); grain refinement
• Language: croatian
• URN:NBN: urn:nbn:hr:115:480850
• Study programme: Title: Graduate study program Metallurgy; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka metalurgije (magistar/magistra inženjer/inženjerka metalurgije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-10-05 09:52:23