This thesis deals with relationship between tensile strength and hardness of aluminium alloys. The introduction provides an overview of aluminum aloys and their properties. In the following section there is an analysis of the processing of aluminum alloys. A large part is devoted to the course of precipitation hardening. The second part of the thesis contains a practical part, which describes the methodology of measuring hardness and tensile strength. The measurement process is described below. At the end, the measured data are processed into various graphs and their results are evaluated.

Práce je zaměřena na výzkum a vývoj technologie přípravy tvrdých anodických vrstev na třech různých typech neželezných materiálů a to (i) hliníkové slitině (AA1050), (ii) čistém hořčíku (99.9% Mg) a (iii) zinkové slitině (ZnTi2). Vhodnou kombinací anodizačních podmínek (napětí, proudová hustota, teplota a složení elektrolytu atd.) lze vytvářet anodické vrstvy s rozdílnými vlastnostmi. V rámci předložené práce byl prokázán vliv předúpravy a anodizačních podmínek na vzhled, morfologii, tloušťku a tvrdost vytvořených anodických vrstev. Pro zvýšení tribologických vlastností a tvrdosti byly anodické vrstvy přímo dopovány Al2O3 částicemi nebo kombinací Al2O3 a PTFE částic během anodizačního procesu. Teoretická část práce popisuje základní principy anodizace, metody používané v průmyslové praxi a v práci je také popsán technologický proces. Experimentální část je rozdělena na tři základní části. První část se věnuje anodické oxidaci hliníkové slitiny AA1050. Druhá část je zaměřena na anodizaci čistého hořčíku a poslední část je zaměřena na anodizaci zinkové slitiny ZnTi2, která není tak známá jako anodizace hliníku.

The diploma thesis addressed the issue of laser surface hardening using dynamic oscillation of the laser beam. The theoretical part presents the hardening technology and suitable using of laser equipments. The fiber laser YLS 2000 was used in the experiment and the hardened material was steel 12 050, which is suitable for laser hardening. The influence of two selected parameters of the scan head on the resulting structure and hardness of hardening layers was examined. Based on the results, the choice of optimal parameters for identical conditions with the experiment was recommended.

The aim of this thessis is heat treatment and choice of material for Woodworking optimalization. Industrial Knives in conjunction with company Pilana Tools Knives. Knives of this company are used in different parts of the world, among others in northern states too, where are working in extreme conditions about temperature low below of freezing point. That’s why was tested many samples in another working conditions.

This thesis deals with the influence of hod dip galvanizing on properties of high-strenght steel. Galvanizing adversely affects the mechanical properties of high-strenght steel. This paper also examines the influence of hod dip galvanizing at hardness high-strenght steels. The task is to assess how the yield stress can galvanize steel.

Diploma thesis is focused on laser hardening by Yb:YAG fiber laser. Experiment is based on hardening of testing pieces made of steel 12 050 with different parameters of distance and movement speed of laser head. In theoretical part are described principle of laser, types of lasers, laser technology in industry, types of lasers, types of hardening and types of hardness measuring. In practical part are firstly evaluated macrostructure and microstructure photos and Vickers hardness. In conclusion are analyzed the results of laser hardening and after that the best laser hardening parameters were selected.

The thesis aimed to study the impact of manufacturing and assembly technology, the valve bolt fitted to diesel high pressure pump CP3 in the Bosch, which has been found to leak. As experimental material was chosen heat treated bolts M16x1,5 made of material 12 050th. Groups of samples were produced in two ranges hardness. Experimental determination of the optimum range of hardness was assessed on the basis of the results of the process of the screw and set the value of plastic deformation of the sealing surfaces of the parts. Experimental section also deals with the analysis of bearing surfaces on the pump and the components, after the screw process. To some extent, is observed as surface treatment

iv Summary Schmidt hammer is the instrument which is used for the assessment of rock mechanical properties and this instrument is classified as the indirect method. This method is based on the assessment of rebound value (R) of the Schmidt hammer, which is measurred by the amount of rebound of the impact plunger from the surface of tested rock. Schmidt hammer is called as the non-destructive method of rock assessment and it is called as in situ testing method as well. The main objective of this work is provement, that Schmidt hammer testing is destructive method and define degree of damage which is caused in the rock mass. Sedimentary rocks were used for the testing, mostly sandstones and arkose sandstones with different types of cement. This made it possible to test the fraction of the rock mass and the relation between fraction and type of cement. The clasts of the rocks had different properties than it was possible to find the relation between grain size and fraction of the rock. Already in procedure of the testing by Schmidt hammer it was obvious, that this metod is definitely destructive. Rock surface after hitting by plunger of Schmidt hammer gains macroscopically observeable destruction. On the surface is the circular track of the plunger and the surface is grinded. It is possible to wipe the small...

The subject of this master’s thesis was to find the causes of impact toughness scattering of forgings of the test disk with dimension range of 540 – 170 mm. The experimental samples were developed from steel A694 F60. To reach the main aim light microscopy, electron microscopy, EBSD technique, fractographic analysis and hardness measurement HV10 were utilized.

This thesis deals with surface re-melting by electron beam of thermal sprayed material NiCrBSi by method HVOF. The microstructure, chemical and phase composition, hardness and abrasive wear resistance were evaluated in depending on the electron beam parameters and modes of the electron beam 6-poinst and line. Observed microstructure was better after both methods of re-melting. The splats were not observed, coating porosity decreased and structure was more homogenous. Structure and phase analysis was acquired by light microscopy, scanning electron microscopy, energy dispersive spectroscopy and x-ray diffraction. A small change in hardness between modes of re-melting was observed, but measured hardness was higher than in sample without re-melting. Similar results were observed for abrasion resistance.