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Modeliranje rekristalizacije z upoštevanjem vpliva precipitacije in upora atomov topljenca na mobilnost velikokotnih mej : diplomsko delo
ID Modrijan, Ožbej (Author), ID Kugler, Goran (Mentor) More about this mentor... This link opens in a new window

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Abstract
V diplomskem delu smo raziskali vpliv precipitatov, upora atomov topljenca in časov čakanja pred plastično deformacijo na kinetiko statične rekristalizacije. Simulacije smo izvajali na primeru izločanja niobijevega karbida v modelnem mikrolegiranem HSLA jeklu. Program za izvajanje simulacij sestoji iz precipitacijskega in rekristalizacijskega modela. V slednjega je vključen tudi model, ki upošteva upor atomov topljenca. Oba uporabljena modela temeljita na teoriji povprečnega polja. Model eksplicitno upošteva vpliv precipitacije preko Zenerjevega tlaka in upor atomov topljenca na mobilnost velikokotnih mej. Simulacije smo izvedli v treh sklopih. V prvem nismo upoštevali procesov izločanja, kot tudi ne upora atomov niobija. V drugem sklopu smo upoštevali vpliv precipitatov, v zadnjem pa smo upoštevali tudi upor atomov topljenca. Simulirali smo razvoj mikrostrukture pri različnih temperaturah, hitrostih deformacije, koncentracijah niobija, začetnih velikostih kristalnih zrn in pri različnih časih čakanja pred deformacijo. Rezultate simulacij ob spreminjanju različnih vhodnih parametrov smo med seboj primerjali in analizirali. Izvedene simulacije ob upoštevanju vpliva atomov topljenca smo primerjali z deli drugih avtorjev, kjer smo ugotovili, da model ustrezno deluje in podaja primerljive rezultate.

Language:Slovenian
Keywords:statična rekristalizacija, precipitacija, Zenerjev tlak, upor atomov topljenca, mobilnost, preoblikovanje v vročem.
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:NTF - Faculty of Natural Sciences and Engineering
Place of publishing:Ljubljana
Publisher:O. Modrijan
Year:2023
Number of pages:X, 32 f.
PID:20.500.12556/RUL-148436 This link opens in a new window
UDC:669
COBISS.SI-ID:165113091 This link opens in a new window
Publication date in RUL:23.08.2023
Views:886
Downloads:45
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Secondary language

Language:English
Title:Modelling of recrystallization considering the influence of precipitation and solute drag on a high angle grain boundary mobility : diploma work
Abstract:
In this thesis, we investigated the influence of precipitation kinetics, waiting times before deformation and solute drag on the kinetics of static recrystallization. The simulations were carried out using the precipitation of niobium carbide in a model high-strength low-alloy (HSLA) steel as an example. The program consists of precipitation and a recrystallization model. The latter also includes the model for solute drag. Both models are based on the Mean-Field theory. The model explicitly considers the influence of precipitation via Zener pressure and solute drag on a high-angle grain boundary mobility. The simulations were performed in three parts. In the first part, we eliminated the influence of precipitation and solute drag. In the second part, the influence of precipitation was considered, and in the last one, we also included solute drag. The evolution of microstructure was simulated considering different input parameters, such as temperature, initial grain size, strain rate, the concentration of niobium, and at different waiting times before deformation. The results of the simulations were analyzed and compared. The results in terms of solute drag were compared with the work of other authors where we found that the model works and gives comparable results.

Keywords:static recristallyzation, precipitation, Zener pressure, solute drag, mobility, hot working.

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