Vpliv toplotnih obdelav na mikrostrukturo in mehanske lastnosti SLM Ti6Al4V zlitine : diplomsko delo

Šafarič, Tina (author), Bizjak, Milan (mentor)

V sklopu diplomske naloge smo izdelali in okarakterizirali vzorce zlitine Ti6Al4V, izdelane po postopku selektivnega laserskega pretaljevanja (ang. SLM – Selective Laser Melting). SLM nam omogoča izdelavo oblikovno kompleksnih izdelkov, ki jih po klasičnih postopkih preoblikovanja ni mogoče izdelati. Zaradi izredno velikih hitrosti ohlajanja pri postopku SLM pa imajo vzorci drugačne mehanske lastnosti kot če bi bili izdelani po klasičnih metalurških postopkih. Namen diplomske naloge je bil vpogled v mikrostrukturo SLM izdelanih Ti6Al4V vzorcev, povezava mikrostrukture z mehanskimi lastnostmi, ter analiza vpliva toplotnih obdelav na mikrostrukturo in mehanske lastnosti vzorcev. Eksperimentalni del je zaobjemal pripravo vzorcev, detekcijo mikrostrukturnih sprememb z meritvami električne upornosti, toplotne obdelave pri različnih temperaturah in analizo mikrostrukture. Analiza mikrostruktur pri vzorcih, toplotno obdelanih pri različnih temperaturah, pokaže postopen razpad igličaste ?' martenzitne faze v ? in ß fazo. Učinkovitost analize mikrostruktur smo povečali z določitvijo zanimivih stanj vzorcev med toplotno obdelavo iz sprotnih meritev električne upornosti.

• Language: Slovenian
• Keywords: selektivno lasersko pretaljevanje, Ti6Al4V, toplotna obdelava, mikrostruktura, mehanske lastnosti
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Place of publishing: Ljubljana
• Publisher: [T. Šafarič]
• Year: 2022
• Number of pages: XII, 41 str.
• PID: 20.500.12556/RUL-140905
• UDC: 669
• COBISS.SI-ID: 131733251
• Publication date in RUL: 21.09.2022

ŠAFARIČ, Tina, 2022, Vpliv toplotnih obdelav na mikrostrukturo in mehanske lastnosti SLM Ti6Al4V zlitine : diplomsko delo [online]. Bachelor’s thesis. Ljubljana : T. Šafarič. [Accessed 28 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=140905

Secondary language

• Language: English
• Title: Effect of heat treatments on microstructure and mechanical properties of SLM Ti6Al4V alloy : diploma work

Abstract

In this work, we studied samples of Ti6Al4V produced by the process of selective laser melting of metal powders. SLM allows the production geometrically complex products that cannot be produced using classical metallurgical processes. Due to the extremely high cooling rates in the SLM process, the samples’ microstructure mechanical properties differ from those of conventionally manufactured Ti6Al4V products. The aim of this thesis was to gain insight into the microstructure of SLM-manufactured Ti6Al4V samples, to investigate the correlation between the microstructure and mechanical properties, and to analyse the influence of heat treatments on the microstructure and mechanical properties of the samples. The experimental part of the work included the preparation of the samples, measurements of electrical resistivity on the sample in the initiate state, heat treatment of the samples at different temperatures, and analysis of the microstructure of all samples. When comparing the microstructures of the samples at different temperatures, we observed the gradual decomposition of the needle-like α' martensite phase into the α- and β- phases. The effectiveness of the microstructural analysis was increased by determining the states of interest of the samples during heat treatment based on the in situ electrical resistivity measurements

• Keywords: selective laser melting, Ti6Al4V, heat treatment, microstructure, mechanical properties