Določevanje kristalografske teksture aluminijevih zlitin z digitalnim dvojčkom vročega valjanja : magistrsko delo

Janžič, Aljaž (avtor), Bombač, David (mentor), Kraner, Jakob (komentor), Kugler, Goran (član komisije za zagovor), Knap, Matjaž (član komisije za zagovor)

V magistrskem delu smo primerjali eksperimentalno določeno in numerično napovedano kristalografsko teksturo aluminijevih zlitin EN AW-1050A, EN AW-3105A in EN AW-5754 po vročem valjanju. Pri vseh treh zlitinah smo spremljali položaje ROB, PREHOD in SREDINA prečnega prereza debeline obdelovanca pravokotno na smer valjanja. Glavni cilj magistrskega dela je bila validacija delovanja numeričnega napovednega modela Impol-Release s primerjavo rezultatov simulacij in eksperimentalnih rezultatov vrstične elektronske mikroskopije z uklonom povratno sipanih elektronov (SEM-EBSD). V eksperimentalnem delu smo na omenjenih mestih metalografsko analizirali vzorce lite brame, kot začetno stanje in vroče valjanega traku, kot končno stanje. Mikrostrukturo in kristalografsko teksturo smo opazovali in določili z metodo SEM-EBSD. Termo-mehanski del numerične simulacije smo obdelali s programom RollerCoaster, s katerim smo za posamezne prehode valjanja v vročem pridobili podatke o temperaturi, plastični deformaciji in hitrosti deformacije. Te podatke smo skupaj z začetnimi deleži teksturnih komponent iz litega stanja uporabili kot vhodne podatke za model Impol-Release. Z njim smo nato spremljali razvoj mikrostrukture in kristalografske teksture med vročim valjanjem. Pri primerjavi deleža naključne orientacije kristalnih zrn je bilo odstopanje med eksperimentalno kristalografsko teksturo s SEM-EBSD in napovedano kristalografsko teksturo v sedmih od devetih primerov manjše od 10 %. Najboljše ujemanje smo dobili v SREDINI, večji odstopanji sta bili na ROBU zlitin EN AW-1050A in EN AW-5754. Numerični model je v vseh devetih primerih napovedal višji skupni delež rekristalizacijskih teksturnih komponent od deformacijskih. Rezultati SEM-EBSD so enako razmerje pokazali v osmih primerih. Model je prevlado kubične teksturne komponente (Cube) napovedal v sedmih od devetih primerih, pri čemer sta bili obe odstopanji ponovno na ROBU.

• Jezik: Slovenski jezik
• Ključne besede: aluminijeve zlitine, vroče valjanje, kristalografska tekstura, SEM-EBSD, numerična simulacija, digitalni dvojček
• Vrsta gradiva: Magistrsko delo/naloga
• Tipologija: 2.09 - Magistrsko delo
• Organizacija: NTF - Naravoslovnotehniška fakulteta
• Kraj izida: Ljubljana
• Založnik: A. Janžič
• Leto izida: 2026
• Št. strani: XIII, 41 f.
• PID: 20.500.12556/RUL-188929
• UDK: 669
• COBISS.SI-ID: 293776899
• Datum objave v RUL: 30.09.2026

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Determination of crystallographic texture in aluminium alloys after hot rolling with digital twin : master's thesis

Izvleček

In this master’s thesis, we compared the experimentally determined and numerically predicted crystallographic textures of the EN AW-1050A, EN AW-3105A and EN AW-5754 aluminium alloys after hot rolling. For all three alloys, the EDGE, TRANSITION and CENTRE positions were investigated across the thickness cross-section of the workpiece, perpendicular to the rolling direction. The main objective of the master’s thesis was to validate the performance of the Impol-Release numerical prediction model by comparing the simulation results with the experimental results obtained by scanning electron microscopy with electron backscatter diffraction (SEM-EBSD). In the experimental part, samples from the cast slab, representing the initial state, and from the hot-rolled strip, representing the final state, were metallographically analysed at the selected positions. The microstructure and crystallographic texture were characterised using SEM-EBSD. The thermomechanical part of the numerical simulation was performed using the RollerCoaster software, which provided data on temperature, plastic strain and strain rate for individual hot-rolling passes. These data, together with the initial fractions of texture components determined in the cast state, were used as input data for the Impol-Release model. The model was then used to follow the evolution of the microstructure and crystallographic texture during hot rolling. When comparing the fraction of random orientations, the difference between the experimentally determined SEM-EBSD results and the numerically predicted crystallographic texture was below 10 % in seven out of nine cases. The best agreement was obtained at the CENTRE position, while larger deviations were observed at the EDGE of the EN AW-1050A and EN AW-5754 alloys. In all nine cases, the numerical model predicted a higher total fraction of recrystallization texture components than deformation texture components. The SEM-EBSD results showed the same relationship in eight cases. The model predicted the Cube texture component to be dominant in seven out of nine cases, with both deviations again occurring at the EDGE.

• Ključne besede: aluminium alloys, hot rolling, crystallographic texture, SEM-EBSD, numerical simulation, digital twin