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The Structure and Properties of Austenitic Steel Prepared by the Cold Spray Method and Selected Laser Melting Technology
Osička, Filip ; Šmíd, Miroslav (referee) ; Hutařová, Simona (advisor)
This bachelor's thesis focuses on the comparison of two different technologies, specifically Cold Spray (CS) and Selective Laser Melting (SLM), and their effects on the properties of austenitic unstabilized stainless steel AISI 304L. The difference between these technologies is determined by the difference in their physical principles and thus their different practical applications. The theoretical part of the thesis describes in detail the principles of CS and SLM technologies applied to stainless steel. The experimental part describes the procedures for evaluating samples that were created using CS and SLM technologies, with each sample being produced under different process parameters. The analysis included not only the samples prepared by these methods but also the input material in its original state. The microstructure of the produced materials was extensively examined under a light and scanning electron microscope. Furthermore, porosity, microhardness, and flexural strength were determined. The results of the individual measurements are compared and subsequently discussed in the context of the available scientific literature.
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Development of process parameters for Selective Laser Melting technology for processing of aluminum alloy AlSi7
Zvoníček, Josef ; Dočekalová, Kateřina (referee) ; Koutný, Daniel (advisor)
The diploma thesis deals with the study of the influence of process parameters of AlSi7Mg0.6 aluminum alloy processing using the additive technology Selective Laser Melting. The main objective is to clarify the influence of the individual process parameters on the resulting porosity of the material and its mechanical properties. The thesis deals with the current state of aluminum alloy processing in this way. The actual material research of the work is carried out in successive experiments from the welding test to the volume test with subsequent verification of the mechanical properties of the material. Material evaluation in the whole work is material porosity, stability of individual welds, hardness of the material and its mechanical properties. The results are compared with the literature.
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Heat treatment of maraging steel processted by SLM
Valenta, Jakub ; Vaverka, Ondřej (referee) ; Koutný, Daniel (advisor)
The bachelor thesis deals with the study of the heat treatment of the maraging steel 1.2709 (DIN X3NiCoMoTi18-9-5). The first part of the work is survay of studies that focus on heat treatment of maraging steel made by forging or Selective laser melting technology. Based on that section, a heat treatment was designed by which the samples manufactured on ProX 300 from company 3D Systems and M2 Cusing from company Concept Laser were treated. The effect of heat treatment on the mechanical properties of the samples was subsequently tested by tensile testing and metallographic analysis. The test results of both sets of samples were compared with each other and with the results of other studies and the impact of the described heat treatment on the material was evaluated.
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Optimization of SLM process for manufacturing of assault rifle muzzle device
Kubrický, Jakub ; Majzlík, Pavel (referee) ; Vtípil, Jaroslav (advisor)
The thesis deals with optimization of the manufacturing process of the muzzle device designed for assault rifle. The most common titanium alloy named Ti-6Al-4V was chosen for this task. The introduction summarizes previously existing types of muzzle devices and further describes the SLM technology with a special focus on titanium alloys processing. The optimization methods and their follow-up testing were designed according to theoretical knowledge that is summarized in the theoretical part of this work. Firstly, the aim was to describe the optimization of the manufacturing process with attention to preserving the relative density of the parts. Secondly, the mechanical properties of the parts that underwent different heat treatment were tested.The obtained data were then used to design and manufacture a muzzle device that underwent further testing in real condition afterwards.
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Microstructural stability of materials prepared by aditive manufacturing methods
Hyspecký, Michal ; Pantělejev, Libor (referee) ; Štěpánek, Roman (advisor)
This work deals with the microstructural thermal stability of material 2618 produced by the Selective Laser Melting metho - SLM. Microstructural stability is compared with the stability of material produced by conventional methods. Stability itself is evaluated by changes of microstructure and microhardness. The main finding is that the sample produced by SLM method reached a microhardness of 125 HV 0.3 and after sixteen hours of annealing at 200 °C a decrease of only a few units to 120 HV 0.3 was recorded. Based on the data obtained, it was concluded that the sample produced by SLM method is structurally stable, as it did not occur any significant changes in the microstructure or in the observed mechanical properties. As a result, components produced by SLM method become usable in operation in places with an elevated temperature up to 200 °C (with a given choice of criteria).
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Identification of fatigue damage Al alloy treated with SLM technology using acoustic emission method
Zemanová, Lucie ; Mazůrek, Ivan (referee) ; Mazal, Pavel (advisor)
The aim of the diploma thesis is to study fatigue properties of EN AW-2618A aluminium alloy produced by selective laser melting (SLM). S-N diagrams of reference alloy and SLM material depending on manufacturing conditions were constructed. Reference alloy had the same chemical composition as the SLM material, but it was made by traditional technology (by extruding). While testing, acoustic emission (AE) and resonant frequency of loading was monitored. Fractographic analyses of fracture surfaces were performed. It was found, that SLM material has significantly worse fatigue performance. Fatigue properties are strongly dependent on SLM process parameters settings and precise observance of procedure. The most significant differences in cyclic degradation were found in the length of the stages of fatigue. The more homogeneous the material is, the longer the nucleation stage compared to the total lifetime is. The main source of AE in case of the reference material is plastic deformation on the tip of the crack. For SLM testing, stronger acoustic activity was recorded, because brittle fracture of the material between discontinuities, which is stronger AE source, is more frequent.
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Microstructure of Mg alloys prepared by SLM process
Handl, Jiří ; Vašáková, Kristýna (referee) ; Nopová, Klára (advisor)
The main aim of this bachelor thesis was to research for theoretical part dealing with additive manufacturing and magnesium alloys focused on alloy AZ91D. The experimental work analyzed samples processed by Selective laser melting (SLM) technology with different process parameters. The porosity was measured on the individual samples and the microstructure of alloy AZ91D processed by SLM method was described. The results were linked to the process parameters used and, also to the available literature.
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Mechanical properties of Al alloy prepared by SLM process
Vitásek, Ladislav ; Štěpánek, Roman (referee) ; Pantělejev, Libor (advisor)
The master's thesis deals with properties of aluminium alloys prepared by SLM process. The teoretical part of thesis is focused on decribtion of selective laser melting technology, metallurgical defects and mechanical properties of aluminium alloys processed by this technology. The experimental part of this thesis deals with selections of the SLM process parameters suitable for samples preparation in bulk. Tensile testing at room temperature was used for evaluation of basic mechanical properties. Metallographic and fractographic analyses were performed for evaluation of the microstructure and fracture mechanisms. The materials characteristics obtained on SLM samples were compared with the properties of the same materials grade produced by conventional technologies.
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Design of recoating system for processing of two metal powders using 3D Printing
Guráň, Radoslav ; Němeček, Stanislav (referee) ; Koutný, Daniel (advisor)
The thesis deals with the design, construction and testing of two different metal powder coating equipment, which is able to work with SLM 280HL metal 3D printer. Since the field of multimaterial metal printing by selective laser melting (SLM) has not been significantly investigated yet, an overview of existing patents and possible approaches to the solution has been developed. The device has been successfully designed and a series of tests was carried out defining the issue of applying an improved head that uses a nozzle and an eccentric vibration motor. Based on the experiments performed, the coating parameters of the multimaterial layer of FeAm and 316L materials were defined. A control system for the partial process automation was created for the proposed device. The device was implemented in a printer that demonstrated both the ability to apply a single multimaterial layer of at least 50 m thickness, and the ability to produce a 3D multimaterial component comprised of up to 200 layers and containing material change across all axes.
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Analysis of SLM production accuracy of sipes for tire molds
Tomeš, Jan ; Rapant, Martin (referee) ; Koutný, Daniel (advisor)
The first part of the diploma thesis is focused on the analysis and evaluation of the current production of sipes by two SLM devices PXL and M2 Cusing, produced by Phenix Systems and Concept Laser companies. The samples of both machines went through the same manufacturing process and the same process of measurement and evaluation, in order to carry out comparison between individual machines. Geometric accuracy, surface roughness, mechanical properties, and material structure of the samples have been compared. For the sipes it was necessary to create a digital evaluation methodology of geometry. In the second part of the thesis, process parameters are selected on the basis of research and further their influence on surface roughness of manufactured sipes is analyzed.
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