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Recovery and recrystallization of austenitic steel 08Cr18Ni10T
Čech, Jan ; Gregor, Martin (referee) ; Foret, Rudolf (advisor)
This thesis deals with influences of graded deformations, temperatures and holding times on the grains and subgrains size in steel 08Cr18Ni10T. In literary part of the thesis there are described static and dynamic annealing treatments, then also austenitic stainless steels and some selected types of their processing. In experimental part there is studied grain size on differently deformed samples annealed in temperature range 1050–1200 °C for 10, 50 and 100 minutes. Analysis of present structures units was perform by EBSD. Except of that, there were realized chemical analysis of selected inclusions and also hardness test were realised. Achieved measurement shown, that grain size of chosen steel is depended on all 3 variable values.
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Macrosegregation and microsegregation in austenitic CrNi steels
Ostratický, Marek ; Čech, Jan (referee) ; Záděra, Antonín (advisor)
This diploma thesis deals with segregation cycles in austenitic CrNi steels. In first section deals with theory of macrosegregation and microsegregation cycles. The second part is focused on this cycles in experimental casting. Macrosegregation was measured by spectrometric analyser and by MAGMA simulation program. Microsegregation was measured by electron microscope. The aim of this diploma thesis is verify the influence of setting conditions on heterogenity chemical composition in austenitic CrNi steel. For experimental casting with a wall thickness of about 500 mm will be verified effect of the setting time, residence time between solid and liquid phases and others parameters for macrosegregation and microsegregation in selected elements.
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The Feasibility Study of Small Company
Hošek, Martin ; Čech, Jan (referee) ; Koráb, Vojtěch (advisor)
This masters’s thesis deals with a feasibility study of restaurant creation, which should fill a gap in the market. Suggestions for a solution relating to the enterprise and enabling the company to optimally entry to the market are presented, based on theoretical knowledge, empirical facts and analysis.
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Detection of changes in the image
Čech, Jan ; Zemčík, Tomáš (referee) ; Richter, Miloslav (advisor)
The aim of this thesis is finding changes in two similar pictures made in different periods of time. This task belongs to the field of computer vision. To solve this problem different methods of computer vision are used. First the angle of scanning has to be found. Then pictures go through the proces of preprocessing, afterwards the segmentation and the determination of descriptors are carried out. Finally, the pictures are compared and the differences are pointed out.
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Business Plan
Čech, Jan ; Čech, Martin (referee) ; Bayerová, Vladimíra (advisor)
This work puts mind to process of business plan in section of delivering services. I hold forth on analysis of a market and analysis current status of company in this work and then I devote to project on upgrading the company.
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Influence of solidification conditions on structure and properties of austenitic chrome-nickel steels
Ambrož, Ondřej ; Čech, Jan (referee) ; Záděra, Antonín (advisor)
The thesis deals with the influence of solidification conditions on structure and mechanical properties of austenitic stainless steels. The first part involves the distribution of stainless steels and a basic understanding of the issue of achieving the desired structure and mechanical properties. The second part is focused on austenitic steels and their basic characteristics. This section also describes the experiment and the results achieved. Finally, these results were evaluated and further research steps were recommended.
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Heat treatment of steels
Rosecká, Eva ; Čech, Jan (referee) ; Šenberger, Jaroslav (advisor)
The Bachelor thesis deals with the questions of heat treatment of steels. The literature search explains the basic methods and principles of heat treatment of steels, the iron-carbon chart of equilibrium structure and the IRA and ARA charts of non-equilibrium structure. At-tention is also paid to the equipment for heat treatment of steels, and the principal mechanical properties that are used in the evaluation of steels are explained in brief. The experimental section contains the comparison of three creep-resisting steels in term of “as cast” condition, heat treated steel using operation procedures and laboratory-processed at up-per temperatures specified by the standard. These steels are mostly used in power industry at high temperatures. Their structure and mechanical properties were monitored at various phases of castings production. In conclusion, statistical evaluations and the comparison of those three materials are worked out within the scope of fifty heats.
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