Vpliv ohlajevalne hitrosti in nekovinskih vključkov na strjevanje zlitine AlSi10Mg

Ljutić, Benjamin (author), Mrvar, Primož (mentor)

V diplomskem delu je bil obravnavan vpliv ohlajevalne hitrosti in nekovinskih vključkov na mikrostrukturo zlitine AlSi10Mg. V eksperimentalnem delu smo ulili štiri vzorce zlitine AlSi10Mg. Prva dva vzorca sta osnovna zlitina brez dodatkov. Tretjemu vzorcu smo dodali udrobnjevalec v obliki predzlitine Al-Ti-B in modifikacijsko sredstvo v obliki predzlitine AlSr10. Četrtemu vzorcu smo dodali nekovinske vključke SiO2. Vzorce smo ulili v trajno kokilo stožčaste oblike. Za določitev ohlajevalne hitrosti in izris ohlajevalnih krivulj je bila uporabljena metoda enostavne termične analize (ETA) na dveh različnih mestih v kokili s ciljem določitve vpliva debeline stene na ohlajevalno hitrost. Z metodami diferenčne termične analize (DTA) in diferenčne vrstične kalorimetrije (DSC) smo opredelili kritične točke (TL, TS, TE) in latentne toplote pri taljenju oz. strjevanju. S pomočjo metode svetlobne mikroskopije (SM) smo izvedli karakterizacijo mikrostrukture in opredelili vpliv ohlajevalne hitrosti na mikrostrukturo.

• Language: Slovenian
• Keywords: ohlajevalna hitrost, AlSi10Mg, nekovinski vključki, mikrostruktura, ohlajevalna krivulja
• Work type: High school thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2020
• PID: 20.500.12556/RUL-120957
• COBISS.SI-ID: 34564099
• Publication date in RUL: 28.09.2020

Secondary language

• Language: English
• Title: Influence of cooling rate and nonmetallic inclusions on solidification process of AlSi10Mg alloy

Abstract

In the diploma thesis we discussed the influence of the cooling rate and non-metallic inclusions on the microstructure of the AlSi10Mg alloy. In the experimental part, we casted four samples of AlSi10Mg alloy. The first two were a base alloy without additives. We grain refined the third sample with Al-Ti-B and modified it with AlSr10. Non-metallic SiO2 inclusions were added to the fourth sample. The samples were poured into a cone-shaped permanent steel mold. To determine the cooling rate and plot the cooling curves, a simple thermal analysis (ETA) method was used at two different locations in the mold to determine the influence of wall thickness on the cooling rate. Using the methods of differential thermal analysis (DTA) and differential line calorimetry (DSC) we defined the critical points (TL, Ts, TE) and latent heat during melting and solidification. Using the method of light microscopy (SM), the characterization of the microstructure was performed and the influence of the cooling rate on the microstructure was defined.

• Keywords: cooling rate, AlSi10Mg, non-metallic inclusions, microstructure, cooling curve