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Production and properties of austenitic steels
Líkař, Martin ; Bořil, Petr (referee) ; Ostratický, Marek (advisor)
The bachelor thesis describes production of austenitic steels and their properties. First part of thesis contains general overview of austenitic steels and their division according to chemical composition. The second part includes production, which deals with secondary metallurgy. The third part deals with properties of austenitic steels, where is mentioned their use in practise. The aim is to develop research describing production, properties and composition of austenitic steels in view of their utilization.
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Metallography of stainless steels
Hasoňová, Michaela ; Kalina, Lukáš (referee) ; Zmrzlý, Martin (advisor)
This thesis deals with metallography of stainless steels. At the beginning of theoretical part the history of metallography is shortly summarized. Then the basic knowledge about metallography, ways and methods of preparing samples for subsequent analysis of structure are resumed. There are also summarized methods for examining the macrostructure and microstructure of materials with a particular focus on stainless steels. The literary-search section summarizes recent advances in the study of the structure of materials using methods of metallography. The task of the study was to find suitable composition of etchant to reveal the structure of stainless steels in order to achieve high quality and especially reproducible results.
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Stainless steel for steam sterilizer components
Hradil, David ; Němec, Karel (referee) ; Pacal, Bohumil (advisor)
The thesis titled "Stainless steel for steam sterilizer components" is focused on the selection of the optimum stainless steel for the device, in our case, pure steam generator. In this thesis are introduced the main mechanisms and types of corrosion. There are divided and characterized by various types of stainless steels. The choice of material is carried out with regard to the working environment and the technological possibilities of the individual types of stainless steels.
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Decarburisation and degassing of high-alloyed Cr steels under vacuum
Ertelt, Tomáš ; Pernica, Vítězslav (referee) ; Záděra, Antonín (advisor)
The work deals with the investigation of the effects of vacuum degassing and decarburization in high alloyed stainless steel. The reason for this is to increase corrosion resistance and mechanical properties. The theoretical part is devoted to the analysis of options to reduce carbon, nitrogen, hydrogen and manganese at atmospheric pressure and in vacuum. In experimental part there is the description of melting, calculation of conditions facilitating reduction of oxide inclusions as a function of the gas pressure in the furnace and the evaluation of the influence of vacuum on the content reduction of carbon, nitrogen and manganese.
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Progressive anticorrosive metal materials
Bombera, Mojmír ; Kaňa, Václav (referee) ; Šenberger, Jaroslav (advisor)
This bachelor thesis is aimed at stainless steels problem. At the beginning history of steel and one of the biggest issue of steel, corrosion is described. Next part show basic type of stainless steels, their material characteristic, properties and possibilities of usage. After that metallurgy of stainless steels and process follows. In last topic of this bachelor work samples of usage in various branges are presented.
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Segregation during solidification in austenitic-ferritic stainless steels
Kejha, Richard ; Čech, Jan (referee) ; Pernica, Vítězslav (advisor)
The master thesis deals with processes of segregation in austenitic-ferritic stainless steels. The introductory part consists of characteristics features of austenitic-ferritic steels and theoretical analysis of segregation processes. The second part shows practical measurements of segregation in experimental casting. Macrosegregation was measured on a spectrometric analyzer and simultaneously solved in the simulation program MAGMA. The aim of this thesis is to verify the effect of solidification time and dwell time between liquidus and solidus temperature on the chemical heterogeneity of duplex stainless steel casting of about 500 [mm]. Chemical heterogeneity was solved for selected alloying and accompanying elements such as C, Mo, Ni, Mn, Cr. The microsegregation was not addressed. Comparison of the mechanical properties of cast and heat treated duplex steel was done by tensile testing of samples cut from the center of the casting.
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Manufacture and use of high-alloy steel castings
Koláček, David ; Kaňa, Václav (referee) ; Pernica, Vítězslav (advisor)
This thesis includes material issue-knowledge of stainless steel cast. In the first part of thesis are analysed the causes of corrosion, its impact on metal material and is explained the creation of corrosion resistance.The next part of thesis introduces separation of stainless steel based on structure and chemical composition, explains its properties and its possibilities of using in practise. The thesis also explain some production processes of the stainless steel cast. In the final part of thesis are illustrated some possibilities of using stainless steel in practise.
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Corrosion resistant and heat resistant steels
Kříž, Petr ; Tulka, Jaromír (referee) ; Molliková, Eva (advisor)
This bachelor thesis deals with stainless steels and heat resistant steels. It speaks about their chemical composition, heat treatment, structure and options of its practical usage in various fields. One of its parts is also focused on corrosion in general, corrosion types, economic impacts, kinds of corrosion attacks and factors which affect her.
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