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Evaluation of bearing steel´s microstructural parameters with regards to their mechanical properties and lifetime
Hroš, Michal ; Juliš, Martin (referee) ; Klakurková, Lenka (advisor)
The aim of this bachelor thesis is evaluating the impact of microstructural parameters of bearing materials with an emphasis on evaluation carbidic phase with using protocol SEP 1520. Literary section analyzes the specific groups of materials for the manufacture of rolling bearings, specifically focusing on steel, where is discussed their performance, production, heat treatment, micropurity, microstructure and macroscopic requirements. Work on structure of bearing steel as well as the experimental part of the thesis is focused on a more detailed description carbidic phase materials and the systematic evaluation with regards to type of initial a semifinished product for the manufacture of bearings, the heat treatment, the resulting mechanical properties and especially durability.
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Optimalization of Temperature for Semi-hot Forming of Roll Bearings
Hrouzková, Andrea ; Klakurková, Lenka (referee) ; Doležal, Pavel (advisor)
This bachelor's thesis solve the problems about optimalization of temperature for semi-hot forming of roll bearings steels. The purpose of this thesis is finding the optimal interval of temperatures, in which 100CrMnSi6-4 bearing steel shows good strain and deformation characteristics after forming. Methods for data evaluation of mechanical properties are the tensile and upsetting tests which were performed on higher temperatures. It was microscoped microstructure changes of the bearing steel 100CrMnSi6-4 during temperature influence and classification with the light microscope.
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Research and Development of Technology for Surface Layers of Roll and Sliding Bearings Components
Němcová, Aneta ; Klakurková, Lenka (referee) ; Doležal, Pavel (advisor)
To increase of bearing steels properties are research and development of surface modifications well above dedicated, in present. Basic requirements to the surface modifications are high wear resistance and good temperature resistance (origin by friction). Surface modifications can not negatively influence properties of bearing steels as a substrate. One of the possibilities can be used surface modifications used for high temperature applications. These are based on saturation of substrate surface layer by Al (and Si) elements. This work deals with preparing of Al and Al-Si diffusion layers from slurries on 100Cr6 bearing steel surface and study of elements interaction between coating and bearing steel as a substrate during proceeding of protective layers at high temperatures. To elements interaction study light microscopy, scanning electron microscopy equipped by energy dispersive microanalyses, glow discharge optical emission spectrometry and microhardness measurement methods were used. To the evaluation of layer thickness image analyses was used.
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Research and development of surface modifications of bearing steels by means of ion nitridation
Klimčáková, Kateřina ; Klakurková, Lenka (referee) ; Doležal, Pavel (advisor)
Basic requirements placed on rolling bearing components include the high fatigue limit, the wear resistance and the corrosion resistance. As full production of bearings from materials with these attributes would be quite expensive, surface modifications are used to improve mechanical characteristics. This thesis deals with application of layers to the bearing steel by means of ion nitridation. It studies effects of input conditions of the ion nitridation and of the surface condition on tribological characteristics of the bearing steel with the above mentioned finishing. The study employed the interaction light microscopy, the scanning electron microscopy equipped by energy dispersive chemical microanalysis, the hardness measurement by Vickers, the glow discharge optical emission spectroscopy, and methods of the phase analysis by means of the X-ray diffraction were used.
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Evaluation of bearing steel´s microstructural parameters with regards to their mechanical properties and lifetime
Hroš, Michal ; Juliš, Martin (referee) ; Klakurková, Lenka (advisor)
The aim of this bachelor thesis is evaluating the impact of microstructural parameters of bearing materials with an emphasis on evaluation carbidic phase with using protocol SEP 1520. Literary section analyzes the specific groups of materials for the manufacture of rolling bearings, specifically focusing on steel, where is discussed their performance, production, heat treatment, micropurity, microstructure and macroscopic requirements. Work on structure of bearing steel as well as the experimental part of the thesis is focused on a more detailed description carbidic phase materials and the systematic evaluation with regards to type of initial a semifinished product for the manufacture of bearings, the heat treatment, the resulting mechanical properties and especially durability.
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Research and Development of Technology for Surface Layers of Roll and Sliding Bearings Components
Němcová, Aneta ; Klakurková, Lenka (referee) ; Doležal, Pavel (advisor)
To increase of bearing steels properties are research and development of surface modifications well above dedicated, in present. Basic requirements to the surface modifications are high wear resistance and good temperature resistance (origin by friction). Surface modifications can not negatively influence properties of bearing steels as a substrate. One of the possibilities can be used surface modifications used for high temperature applications. These are based on saturation of substrate surface layer by Al (and Si) elements. This work deals with preparing of Al and Al-Si diffusion layers from slurries on 100Cr6 bearing steel surface and study of elements interaction between coating and bearing steel as a substrate during proceeding of protective layers at high temperatures. To elements interaction study light microscopy, scanning electron microscopy equipped by energy dispersive microanalyses, glow discharge optical emission spectrometry and microhardness measurement methods were used. To the evaluation of layer thickness image analyses was used.
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Research and development of surface modifications of bearing steels by means of ion nitridation
Klimčáková, Kateřina ; Klakurková, Lenka (referee) ; Doležal, Pavel (advisor)
Basic requirements placed on rolling bearing components include the high fatigue limit, the wear resistance and the corrosion resistance. As full production of bearings from materials with these attributes would be quite expensive, surface modifications are used to improve mechanical characteristics. This thesis deals with application of layers to the bearing steel by means of ion nitridation. It studies effects of input conditions of the ion nitridation and of the surface condition on tribological characteristics of the bearing steel with the above mentioned finishing. The study employed the interaction light microscopy, the scanning electron microscopy equipped by energy dispersive chemical microanalysis, the hardness measurement by Vickers, the glow discharge optical emission spectroscopy, and methods of the phase analysis by means of the X-ray diffraction were used.
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Optimalization of Temperature for Semi-hot Forming of Roll Bearings
Hrouzková, Andrea ; Klakurková, Lenka (referee) ; Doležal, Pavel (advisor)
This bachelor's thesis solve the problems about optimalization of temperature for semi-hot forming of roll bearings steels. The purpose of this thesis is finding the optimal interval of temperatures, in which 100CrMnSi6-4 bearing steel shows good strain and deformation characteristics after forming. Methods for data evaluation of mechanical properties are the tensile and upsetting tests which were performed on higher temperatures. It was microscoped microstructure changes of the bearing steel 100CrMnSi6-4 during temperature influence and classification with the light microscope.
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Vysokocyklová únava ložiskové oceli
Kunz, Ludvík ; Činčala, M.
S-N curve of 14109 bearing steel was experimentally determined in symmetrical tension-compression in the interval of 10 to 5 to 10 to 8 cycles to fracture. Continuous increase of the number of cycles to fracture with decreasing stress amplitude was observed. Large scatter of experimental data is related to the initiation of fatigue cracks on internal defects of Al2O3 and TiN type.
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