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Microstructure and Mechanical Properties of Steels
Stavinoha, Jakub ; Pavloušková, Zina (referee) ; Molliková, Eva (advisor)
This bachelor’s thesis is concerned with studies of relationships between grain size and mechanical properties of steels. Theoretical part deals with structure of the steels, with reaction of the material to the external stress, methods of estimating the grains size and strain-stress diagrams. In the practical part there are evaluated scratch patterns and strain-stress diagrams of steel C10E4Cu3+N. The conclusion of thesis includes the evaluations of the results from practical part and comparison with the theoretical part.
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Heat treatment processes optimalization of ADI with graded Ni content
Klimentová, Jiřina ; Stránský, Karel (referee) ; Pavloušková, Zina (advisor)
This work is focused on segregation processes in the matrix of spheroidal graphite cast iron with different silicon and nickel content during heat treatment. The aim of this work is to trace the redistribution of the elements of interest during homogenization annealing with different dwell time by comparison of the effective distribution coefficients. Comparison of some specific properties and description of structure development of spheroidal graphite cast iron matrix from initial state to the state after ferritization and homogenization annealing is included in this work.
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The application of legal standards in materials engineering
Večeřa, Petr ; Pantělejev, Libor (referee) ; Pavloušková, Zina (advisor)
The thesis describes points where the basic universal prescriptive system of law interferes with the questions of materials engineering. The main part of the thesis concerns legal liabilities, mainly civil liability represented with liability for defects. Basic analysis of chosen topics concerning liability for defects is done, defects are divided into groups as far as both technical and legal point of view is concerned. Consequently, the most common methods, principles and tests used for recognition and assessment of materials characteristics, both destructive and non-destructive, are described. Chapter, which deals with degradation processes follows. Integral part of the thesis are thoughts of possible types of legal liabilities, which could be important for materials engineers, with basic recommendations for contracting, as well as chosen problems connected with judicial proceedings and out of court settling of disputes. Technical standards are described with high attention, because both technical and legal public is not familiar with the legal background of technical normalisation.
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Application of Homogenization Annealing to Suppress Silicon and Nickel Segregation in Ductile Iron
Pavloušková, Zina ; Zemčík, Ladislav (referee) ; Vřešťál, Jan (referee) ; Švejcar, Jiří (advisor)
This doctoral thesis deals with the comparison of different methods of alloying elements’ concentration measurement based on energy dispersive spectroscopy and also with the suitability of particular methods of quantitative assessment of heterogeneity of the spheroidal graphite cast iron matrix. The segregation curves construction, distribution coefficient and heterogeneity index formulation is also discussed. The notion “normalized distribution coefficient” is introduced newly. The goal of the thesis, which is to be achieved by means of evaluation of large experimental data sets, is the evaluation of applicability of homogenization annealing of spheroidal graphite cast iron with the aim to eliminate segregation of silicon, and mainly nickel, as pearlite- and carbide-forming agent at the border of an eutectic cell. The result is an optimized homogenization annealing schedule maximizing the suppression of silicon and nickel segregation while taking into account the minimization of financial expenses and risk of grain coarsening.
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The Structure and Properties of Cast Ceramic EUCOR
Klimentová, Jiřina ; Trunec, Martin (referee) ; Pavloušková, Zina (advisor)
The diploma thesis deals with cast ceramics EUCOR which can be described as three-phase system, composed of corundum, baddelyite and a glassy phase. The study was focused on the analysis of structure and phase composition of the material, together with the assessment of their influence on the basic mechanical characteristics. The techniques of light and scanning electron microscopy were used together with energy-dispersive microanalysis, X-ray diffraction and microhardness measurement.
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Development of materials used for downhill skis production
Václavík, Martin ; Jech, David (referee) ; Pavloušková, Zina (advisor)
The submitted thesis is a retrieval type and is concerned with the technologies and materials used in the manufacture of downhill skis with a deeper focus on the last ten years. Examined are materials for the manufacture of ski cores as well as other parts of the ski, and that in terms of comparison of the construction materials and technologies. Listed are basic elements and characteristics of skis, methods of manufacture, materials for the manufacture of individual parts of the skis and, last but not least, the types of skis. The work is eked out with the analysis of several samples of skis, on which were made cuts, they were observed and structures were compared. The aim of this observation was to determine whether the materials found in the practical section corresponds to the information contained in the theoretical part.
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