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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 25
Jeníček, Štěpán , Peković, Michal , Opatová, Kateřina , Vorel, Ivan
Relationship between Mechanical Properties in 42SiCr and 42SiMn Medium-carbon Steels and Austempering Temperatures

Sheet metal forming boundaries are established using the forming limit diagram (FLD). The Nakajima and Marciniak tests, which are based on stretching a material using a punch, are the most commonly used methods for determining the FLD or fracture forming limit diagram (FFLD). The&#...

Khalaj, Omid , Ghobadi, Moslem , Zarezadeh, Alireza , Saebnoori, Ehsan , Jirková, Hana , Chocholatý, Ondřej , Svoboda, Jiří
Potential role of machine learning techniques for modeling the hardness of OPH steels

This paper examines the influence of Johannes Crato and the seminal treatises on medicine and botany written by leading Central European scholars during the early modern period on the erudition and genesis of poetic work of the Elizabethan poet Philip Sidney. Johannes Crato (1519-1...

Růžička, Jan , Čejková, Petra , Kříž, Antonín , Balcar, Martin , Tkadlečková, Markéta , Studecký, Tomáš
Austenitické oceli s přídavkem bóru pro výrobu komponent ke skladování použitého jaderného paliva

Used nuclear fuel in the form of fuel assemblies or cartridges must be first stored in storage pools for several years after being removed from the reactor, then placed in a transport-storage package for medium-term storage, and then possibly in a permanent storage package. Th...

Bartoň Klufová, Pavla , Kříž, Antonín , Tittel, Jan , Doležalová, Kamila
Protikorozní povrchová ochrana oceli C45 kompozitním laserovým návarem na bázi měď-čedič

The present contribution explores the corrosion resistance of a composite copper-basalt laser clads. The substrate was a C45 steel sheet 20 mm in thickness. The filler materials were two mixtures of Oerlikon METCO 55 powder (high-purity copper) and basalt dust. These two constituents&#x...

Vilcsek, Igor , Stach, Ondřej , Kříž, Antonín
Orbitální svařování heterogenních spojů

For nuclear energy, fusion arc welding is one of the key technologies not only for production of equipment, but also for its maintenance, assembly and repair. Due to the fact that there is a radioactive medium inside the facility, the leakage of which could have catastrop...

Postelnyk, Hanna , Sobol, Oleg , Stolbovoy, Vyacheslav , Serdiuk, Iryna , Chocholatý, Ondřej
Structure and corrosion resistance of vacuum-arc multi-period CrN/Cu, ZrN/Cu, and NbN/Cu coatings

The structure and properties of vacuum-arc multi-period composite coatings of the MeN/Cu system (where Me is Cr, Zr, and Nb) are studied. It was found that at the smallest nanolayer thickness (about 8…10 nm) of composites in the layers of all systems, only a phase wi...

Staszuk, Marcin , Pakula, Daniel , Reimann, Lukasz , Król, Mariusz , Basiaga, Marcin , Myslek, Dominika , Kříž, Antonín
Structure and Properties of ZnO Coatings Obtained by Atomic Layer Deposition (ALD) Method on a Cr-Ni-Mo Steel Substrate Type

This paper aimed to investigate the structure and physicochemical and tribological properties of ZnO coatings deposited by ALD on 316L stainless steel for biomedical applications. To obtain ZnO films, diethylzinc (DEZ) and water were used as ALD precursors. Zinc oxide layers were deposit...

Bricín, David , Průcha, Vojtěch
The influence of boriding on the properties of cemented carbides

Sintered carbide boriding is used either to form interlayers to increase the adhesion of deposited diamond layers to them by chemical vapor deposition (CVD) or to form layers on machine tools, which are then used without further processing in machining. To this end, it is ...

Bricín, David , Kříž, Antonín
Comparison of the effect of the applied energy on the properties of prototypes made from different types of powder mixtures

The paper deals with the influence of different types of WC-Co powder mixtures processed by SLM technology on the final properties of the prototype build.The powder mixtures used differed in the morphology of the powder particles, i.e. the shape, size and chemical composition of&#x...

Moskovchenko, Alexey , Vavilov, V. P. , Švantner, Michal , Muzika, Lukáš , Houdková Šimůnková, Šárka
Active IR Thermography Evaluation of Coating Thickness by Determining Apparent Thermal Effusivity

Pulsed thermography is a common technique for nondestructive testing (NDT) of materials. This study presents the apparent effusivity method for the quantitative evaluation of coating thickness in a one-sided thermal NDT procedure. The proposed algorithm is based on determining a threshold va...

Kučerová, Ludmila , Hájek, Jiří , Vítek, Jan
The Effect of Cryogenic Treatment on Mechanical Properties, Wear and Corrosion Resistance of Aluminium Alloy AW7075

Effect of addition of cryogenic treatment to a standard heat treatment of aluminium alloy AW 7075 was tested in this work. Used heat treatment consisted of solution annealing at 470 °C for two hours and precipitation aging treatment at 130°C for 14 hours, 120 °C for ...

Khalaj, Omid , Saebnoori, Ehsan , Chocholatý, Ondřej , Jirková, Hana , Svoboda, Jiří
High Temperature and Corrosion Properties of A Newly Developed Fe-Al-O Based OPH Alloy

Bricín, David , Elmanová, Andrea , Kříž, Antonín
The effect of selective laser melting technology on the development of the structure of samples made from WC-Co powder

The aim of this study was to analyse how changing the processing parameters of WC-Co powder affects its properties. The powder mixture properties were evaluated by technological tests firstly and then the results were than compared with properties of SD251 stainless steel powder wh...

Hájek, Jiří , Rot, David , Jiřinec, Jakub
Distortion in induction-hardened cylindrical part

This article concerns distortion of a workpiece after induction-hardening under various conditions. It focuses particularly on the effects of quenching water temperature, PAG polymer concentration and the rotation speed of the workpiece during induction hardening. Electrical as well as non-electrical&...

Kříž, Antonín , Průcha, Vojtěch
Condition of carbides in high-speed steels after multidirectional forging

Although heat treatment of high-speed steels has been covered in numerous treatises, their microstructure before treatment still receives insufficient attention. This article therefore explores the relationship between the initial microstructure and resultant properties in heat treated steels for cutting&#...

Bricín, David , Kříž, Antonín
Processability of WC-Co powder mixtures using SLM additive technology

This contribution presents the findings from an experimental study which explored the possibility of processing WC-Co-based powders using selective laser melting (SLM) additive technology. Two commercially available WC-Co powder mixtures were studied. One is intended for thermally sprayed coatings and...

Beneš, Petr , Průcha, Vojtěch , Hájek, Jiří , Vítovec, Vilém
Possibility of Using Eddy Current Evaluation of the Heat Treatment of Steel

There are a large number of special methods for exploring the internal condition of materials on the basis of eddy currents. A major use of this method can be seen in surface engineering, particularly in studyiing some state quantities of surface integrity. It is also an&...

Benešová, Soňa , Kesl, Miloslav
Příprava kované rychlořezné oceli s vysokým stupněm prokování a ultrajemnou strukturou pro speciální nástroje

The paper describes the problem of high-speed steel forging. To achieve wear resistence and high reability of steel tools, a high degree of forging must be ensured. High-speed steel is one of the hard-to-formable materials with a narrow forging temperature interval. Exceeding the u...

Průcha, Vojtěch , Kříž, Antonín , Žďánský, Ondřej , Vnouček, Milan
Analysis of Fractured Weldment of Hadfield Steel

This contribution is divided into two sections. The first one deals with identifying the cause of fracture in a ring, which fractured after weld surfacing. Optical and scanning electron microscopy and hardness testing were employed. Chemical composition was determined using the GDOES an...

Průcha, Vojtěch , Bricín, David , Kříž, Antonín
Effect of Cryogenic Treatment on Properties of Cemented Carbides

The main goal of this paper is to present experiments exploring the effect of cryogenic treatment on the properties of cemented carbides. The experimental materials were chosen from three basic groups of cemented carbides with different binders and different WC grain sizes. One hal...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 25