|
|
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.
|
|
|
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.
|
|
|
Influence of thermal processing to microstructure of various steels
Kocman, Lukáš ; Havlík, Petr (referee) ; Štěpánek, Roman (advisor)
This bachelor thesis deals with the heat treatment of steel, especially measuring the influence of individual heat treatment technologies on changes in the microstructure of steels. The theoretical part of the work presents alloys of iron and carbon, furthermore describes their phase transformations in the solid state, particularly the transformation diagrams of steels. In another part of theoretical part, the basic heat treatment technologies and their influence on the mechanical properties and microstructure of steels are described. The experimental part deals with the preparation of metallographic samples and presents results of examining the microstructure and measuring the hardness of individual samples. At the end of the work the synthesis of the theoretical part and results of the experimental part is used for the partial and overall evaluation of the influence of heat treatment on the microstructure of steels.
|
|
|
Mechanical properties and structure of the aluminum alloy after heat treatment
Roleček, Jakub ; Julišová, Martina (referee) ; Juliš, Martin (advisor)
The presented bachelor´s thesis deals with the influence of heat treatment especially artificial aging on mechanical and structural properties of AlSi7Mg0.6 alloy. Cylindrical test bars of diameter 6 mm and 9 mm cast into a self-supporting ceramic shell made by plaster investment technology were used as experimental samples. These test bars were cast by Alucast whereas the patented technology of casting- JF casting was used. On the test bars was carried out the T6 heat treatment according to the Standards AMS 2771C. After the solution annealing were test bars divided to the six groups and put through various time of artificial aging, namely from 2 to the 12 hours. In order to evaluate the effect of the time of artificial aging on the structure and mechanical properties of both diameters of the test bars, the method of light microscopy, Brinell hardness test and static traction test were used. Also SDAS quantification was carried out by means of image analysis. On the grounds results of experiments it is possible to state, that the best values of mechanical properties of both diameters of the cylindrical test bars were reached after 10 hours of artificial aging.
|
|
|
Influence of location of Al castings in a heat treatment furnace on mechanical properties
Toufar, Tomáš ; Vašťák, Patrik (referee) ; Horenský, Jiří (advisor)
The present Master thesis deals with location of aluminium castings in the heat treatment furnace and its influence on mechanical properties. As testing samples for the experimental part, tensile bars were used; they were cast from the subeutetic silumin AlSi7Mg0,6. These samples were placed in the furnace in the locations where temperatures were calibrated by the furnace supplier. Then, tensile tests were performed to evaluate the resulting mechanical properties of the samples. The experiment was carried out in the foundry of non-ferrous metals, MESIT foundry Ltd., Uherské Hradiště.
|
|
|
Corrosion of Nonferrous Metal Materials
Ševčíková, Barbora ; Nový,, František (referee) ; Pacal, Bohumil (referee) ; Havlica, Jaromír (advisor)
In the presented dissertation thesis, I closely focused on corrosion resistance of non-ferrous metals. For full understanding of the possibilities for increasing corrosion resistance, it was vital to initially recognize the influences to the corrosion system of the samples and their surrounding environment. For this purpose, I focused on heat treatment, corrosion, and protective coatings, in the theoretical part of the thesis. For the subsequent research, it was necessary to define several constant variables, first. For this purpose, I have chosen a group of magnesium alloys, namely AZ91 Alloy and 3.5 % NaCl Electrolyte. AZ91 Alloy is of heterogenous structure formed by a solid solution of aluminum in magnesium, intermetallic phase in Mg17Al12, and their eutectic. Local microcells tend to occur in these heterogenities, which leads to faster corrosion. In order to increase corrosion resistance of the alloy, I used a combination of heat treatment and protective phosphate coating. For creating of the desired structure, which further affects compact coating formation, I selected a process involving solution heating with precipitation hardening T6. Secondary goals of the thesis involved optimization of standard technical procedures for the sake of increasing efficiency. With regard to this goal, I introduced optimized heat treatment T6 using accelerated cooling of a sample in water and liquid nitrogen. A modification besides the standard phosphating procedure was carried out with no activation step. For evaluation of corrosion resistance of the samples, I conducted water immersion tests using electrochemical methods; such as potenciodynamic curves combined with electrochemical impedance spectroscopy. In order to streamline the evaluation of the corrosion surface in technical practice, I used automatic detection. Substantial improvement of corrosion resistance of the above mentioned system, compared to heat-untreated samples, was proven through electrochemical methods. Due to accelerated cooling, a more homogeneous structure was achieved, which could be further utilized to create more uniform protective coating. For some phosphate coating, specifically manganese phosphate coating, I identified certain modifications that were in line with the set goals; i.e. skipping the activation phase, and using automatic detection for evaluation of uniform corrosion on the samples.
|
|
|
Influence of heat treatment on microstructure of iron alloys with carbon
Hranický, Pavel ; Jan, Vít (referee) ; Čupera, Jan (advisor)
The work focuses on the influence of hardening on the structure of specially prepared iron alloys with carbon, with as little admixture of other elements. The effect of hardening is judged by the hardness of the resulting alloy. Two hardening temperatures, one optimal for the hardness of the resulting structure and one high, are used. Hardening takes place in water. Four different alloys are examined for which the carbon content ranges from 0.01 % to 3.00 %. The results are evaluated on the basis of hardness, microhardness and observation of the resulting structures and phases on the light and electron microscopy. Part of the thesis is a review summarizing the knowledge about the heat treatment of iron alloys with an emphasis on hardening.
|
|
|
Manufacture of knives and their heat treatment
Bukvic, Tomáš ; Doležal, Pavel (referee) ; Němec, Karel (advisor)
This bachelor thesis deals with manual small series production of knives. It presents an overview of used cutlery steels and ushers their characteristics. It deals with the choice of blade geometry and material for a particular knife application. Furthermore, it initiates into the issue of heat treatment of knives, which is absolutely necessary for their functionality. The conclusion includes the documentation of the kitchen knife manufacturing process, which was made for the purpose of this thesis.
|
|
|
Heat treatment of ductile iron
Vávrová, Veronika ; Ostratický, Marek (referee) ; Bořil, Petr (advisor)
The bachelor thesis is focused on heat treatment and influence on the structure and properties of ductile iron. In the first part there is a description of the basic properties of ductile iron. Then the various types of heat treatment are presented. There is an experiment included focused on ferritisation annealing and its influence on the structure.
|
|
|
Heat treatment of aluminum alloys
Adami, Martin ; Čupera, Jan (referee) ; Němec, Karel (advisor)
This bachelor theses deals with description aluminium alloys, theirs applications in engineering and theirs heat treatment. First part is focused on pure aluminium and its production. The other one is about distribution aluminium alloys by possibility of precipitation hardening.
|
guest ::
