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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 34
Staszuk, Marcin , Reimann, Lukasz , Pakula, Daniel , Pawlyta, Miroslawa , Musztyfaga-Staszuk, Małgorzata , Czaja, Pawel , Beneš, Petr
Investigations of TiO2/NanoTiO2 Bimodal Coatings Obtained by a Hybrid PVD/ALD Method on Al-Si-Cu Alloy Substrate

This study aimed to investigate the influence of bimodal TiO2/nanoTiO2 coatings obtained in the PVD/ALD hybrid process on an Al-Si-Cu-type aluminium alloy on the physicochemical properties of the investigated materials. The reference materials were uncoated substrates and samples coated with...

Votava, Filip , Vrtáček, Jiří , Sýkora, Jindřich , Weinar, Michal , Jirková, Hana
Design of a Combined Tool for Sheet Tailoring during Press Hardening

Press hardening is used to produce complex parts by hardening them in a die. This results in martensitic structures with high strength values but low ductility. However, for real components, the combination of places with high strength or high ductility is required. One possibility...

Kiran, Abhilash , Li, Ying , Koukolíková, Martina , Brázda, Michal , Hodek, Josef , Urbánek, Miroslav , Džugan, Ján , Raghavan, Srinivasan , Odehnal, Josef
Elevated Temperature Baseplate Effect on Microstructure, Mechanical Properties, and Thermal Stress Evaluation by Numerical Simulation for Austenite Stainless Steel 316L Fabricated by Direct Energy Deposition

In the present study, the effect of material deposition at the elevated temperature baseplate on the microstructure and mechanical properties was investigated and correlated to the unique thermal history by using numerical simulation. Numerical results agreed well with the experimental results&#x...

Brabec, Josef , Ježek, Śtěpán , Beneš, Libor , Kříž, Antonín , Majrich, Petr
Suitability confirmation for welding ultra-high strength steel S1100QL using the RapidWeld method

This experiment assesses the suitability of square-welding high strength steel using the deep penetration welding method, RapidWeld. The aim of this method suitability assessment was to compare the final material properties of three welds, welded accordingly to identical welding procedures. High&...

Odehnal, Josef , Ludvík, Pavel , Studecký, Tomáš , Michálek, Pavel
Development of Universal Mould Geometry for the Teeming of Cylindrical Iron-Base Alloy Ingots

The presented work is aimed at developing a mould geometry suitable for casting both low- and high-alloy steel grades into 500 kg experimental ingots. The high Height-to-Diameter (H/D)-ratio mould currently used in COMTES FHT Inc. served as a reference and for finite element m...

Průcha, Vojtěch , Jansa, Zdeněk , Veselý, Vilém
Influence of deep cryogenic processing on carbide grain size in sintered carbide WC-Co

The paper deals with the change in carbide grain size of sintered WC-Co carbide after cryogenic pro-cessing. Because this structural parameter has a significant effect on mechanical properties. Some sources indicate that due to cryogenic processing takes place to reduce the size of ...

Bricín, David , Kříž, Antonín
Influence of the boriding process on the properties and the structure of S265 steel and X6CrNiTi18-10 steel

This investigation studied the changes in the microstructure of steels S265 and X6CrNiTi18-10 as a result of their chemical-thermal treatment by boriding. The steels were borided in Durborid boriding powder at 900 0C. During this process, surface layers of Fe-B borides formed in bo...

Bartoň Klufová, Pavla , Kříž, Antonín , Duliškovič, Josef , Vostřák, Marek
Composite laser claddings for corrosion protection of outer surfaces of storage containers for spent nuclear fuel in underground repositories

The present contribution examines the structures of and corrosion processes in copper-basalt compo-site laser claddings on a steel substrate. The cladding material was a laboratory-prepared mixture of the following components: Oerlikon METCO 55 (Cu > 99.9 %) and basalt powder. The metallo...

Hájek, Jiří , Dlouhá, Źaneta , Průcha, Vojtěch
Comparison of Industrial Quenching Oils

This article is a response to the state of the art in monitoring the cooling capacity of quenching oils in industrial practice. Very often, a hardening shop requires a report with data on the cooling process for a particular quenching oil. However, the interpretation of t...

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 ...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 34