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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 32
Hanzl, Pavel , Zetek, Miroslav , Rulc, Vojtěch , Purš, Hynek , Zetková, Ivana
Finite Element Analysis of a Lightweight Milling Cutter for Metal Additive Manufacturing

Previous work has proposed a process for implementing a lattice structure into a milling cutter body based on clustering in the milling cutter with modified main dimensions of a BCC cubic lattice structure cell. A finite element analysis model has been created to predict the&#...

Bunda, Zbyněk , Kučerová, Ludmila , Kepka, Miloslav
The Crack Analysis of Fatigue Tested Steel Construction

Laboratory fatigue testing is an important part of the fatigue design of machine components that are supposed to work under cyclic loading. These tests are used to confirm whether the tested component matches the required fatigue life and they also serve as a verification of&#...

Janda, Tomáš , Jirková, Hana , Jeníček, Štěpán , Kučerová, Ludmila
Influence of cooling rate on microstructure and mechanical properties of 42SiCr steel after Q&P process

Using innovative methods of heat treatment (HT) for high-strength steels, such as the Q&P process, very favoura-ble ratios of ductility and strength can be achieved. Materials processed by this technology have higher content of retained austenite, and therefore better ductility. This exp...

Peković, Michal , Opatová, Kateřina , Rubešová, Kateřina , Janda, Tomáš , Jirková, Hana , Bureš, Radovan
Observation of phase transformations in high-temperature chamber under microscope objective lens

Today, extensive information on a particular material can be obtained from its chemical composition using vari-ous computer programs. Such information includes phase transformation temperatures, such as Ac1 and Ac3 or the Ms and Mf, as well as the entire austenite decomposition sequence,...

Jirková, Hana , Zetková, Ivana , Cajthamlová, Šárka , Opatová, Kateřina , Rubešová, Kateřina , Kučerová, Ludmila
Vliv směru tisku při pěchování vzorků vyrobených 3D tiskem z maragingové oceli MS1

Additive technologies make it possible to produce complicated parts from various materials, which leads to their rapid expansion into various areas of industry. The properties of the parts produced by 3D printing are very influenced not only by the laser setting parameters, the thi...

Tungga Dewa, Rando , Kepka, Miloslav , Kepka, Miloslav
Statistical approaches on the design of fatigue stress spectra for bus structures

This paper presents technical procedures and statistical approaches on the extrapolation of fatigue stress spectra for the critical part of the bus structure. The approach for such stress spectra extrapolation can be used for determining long-term stress spectra at expected service life....

Neslušan, Miroslav , Minárik, Peter , Čilliková, Mária , Kolařík, Kamil , Rubešová, Kateřina
Barkhausen noise emission in tool steel X210CR12 after semi-solid processing

This study reports about magnetic Barkhausen noise in tool steel X210Cr12 after semi-solid forging. Semi-solid subsequent forging involves the partial melting of the workpiece followed by quenching. This process remarkably affects the character of the resulting matrix; stress state; volume of...

Kindl, Vladimír , Kavalír, Tomáš , Sika, Jiří , Křížek, Michal
Correction of oblique-angle oscillation for laser doppler vibrometry

The paper proposes a correction method of the oblique-angle vibration for laser doppler vibrometry. It briefly discusses the key mathematical approach considering the surface of the analysed object to be a reference plane and gives a practical example of the method proper application.&#...

Khalaj, Omid , Jirková, Hana , Janda, Tomáš , Kučerová, Ludmila , Studený, Tomáš , Svoboda, Jiří
Improving the high-temperature properties of a new generation of Fe-Al-O oxide-precipitation-hardened steels

Increasing efficiency in power engineering is conditional on the improvement of the high-temperature properties of structuralmaterials. A new Fe-Al-O Oxide-Precipitation-Hardened (OPH) steel was developed by the authors to dissolve the requiredamount of O in the matrix during mechanical alloying and&#...

Bureš, Marek , Martirosov, Sergo , Polcar, Jiří
A novel projection algorithm for production layout extraction from point clouds

The paper is focused on point cloud data processing obtained by 3D laser scanning. The scanning devices are at a very advanced level and after reaching their possible maximum scanning speeds, manufacturers are now more focused on a minimization of the devices. However, there i...

Jirková, Hana , Opatová, Kateřina , Jeníček, Štěpán , Vrtáček, Jiří , Kučerová, Ludmila , Kurka, Petr
Use of multi-phase trip steel for press-hardening technology

Development of high strength or even ultra-high strength steels is mainly driven by the automotive industry which strives to reduce the weight of individual parts, fuel consumption, and CO2 emissions. Another important factor is to improve the passenger safety. In order to achieve ...

Frohn Sörensen, Peter , Mašek, Bohuslav , Wagner, Martin F.-X. , Rubešová, Kateřina , Khalaj, Omid , Engel, Bernd
Flexible manufacturing chain with integrated incremental bending and Q-P heat treatment for on-demand production of AHSS safety parts

This work proposes a manufacturing chain that combines the two key technologies Incremental Swivel Bending (ISB) and Quenching and Partitioning (Q-P). While incremental forming methods offer chances for production flexibility, strain hardening often exhausts material’s ductility. Heat treatment processes&#...

Härtel, Sebastian , Awiszus, Birgit , Graf, Marcel , Nitsche, Alexander , Böhme, Marcus , Wagner, Martin F. X. , Jirková, Hana , Mašek, Bohuslav
Influence of Austenite Grain Size on Mechanical Properties after Quench and Partitioning Treatment of a 42SiCr Steel

This paper examines how the initial austenite grain size in quench and partitioning (Q-P) processes influences the final mechanical properties of Q-P steels. Differences in austenite grain size distribution may result, for example, from uneven heating rates of semi-finished products prior to...

Jirková, Hana , Opatová, Kateřina , Jeníček, Štěpán , Vrtáček, Jiří , Račický, Antonín
Zpracování vysokopevné vícefázové TRIP oceli metodou press-hardening

Thanks to their properties, TRIP multi-phase steels are used in a wide range of industries. The main driver of their development is mainly the automotive industry, which demands improvements in mechanical properties, weight reduction of individual parts and, of course, also to increase&...

Bublíková, Dagmar , Jirková, Hana , Jeníček, Štěpán , Peković, Michal
Vytvoření materiálově-technologického modelu pro zjištění vlivu rychlosti ochlazování na podíl zbytkového austenitu u zápustkových výkovků z vysokopevných ocelí legovaných MN a SI

Today´s demands on modern closed- die forgings are increasing in terms of not only their engineering design solution but also their mechanical properties. The combination of strength and ductility is of particular importance for proper functioning and long life of forged parts. To ...

Farský, Jindřich , Zetek, Miroslav , Bakša, Tomáš , Adámek, Pavel
Influence of grinding conditions and tilting the spindle on the spindle load when a 5-axis grinder is used

This article deals with the influence of grinding conditions and tilting the spindle on changes in the spindle load when grinding tool steel on a 5-axis tool grinding machine. The experiment was designed to investigate any changes in cutting speed, feed rate or tilting of ...

Opatová, Kateřina , Vorel, Ivan , Jeníček, Štěpán , Peković, Michal
Influence of Bainite Fraction on Improving Mechanical Properties of Quenched and Tem-pered High Silicon Steel

Martensitic steels are characterized by high strength which, on the other hand, is offset by considerable brittleness. This drawback can be partly corrected by tempering, at the cost of reduced final strength. If steel is alloyed with a sufficient amount of silicon, an optimum ...

Kučerová, Ludmila , Bystrianský, Martin , Jeníček, Štěpán
Thermo-mechanical Treatment of 0.4C-0.6Mn-2Si Steel with Various Soaking and Annealing Hold Temperatures

Middle carbon low alloyed steel 0.4C-0.6Mn-2Si was subjected to thermo-mechanical treatment typical for TRIP (transformation induced plasticity steels). The processing consisted from soaking at the temperatures of 850-1000 °C and cooling at 30 °C/s to various annealing holds in bainite trans...

Kučerová, Ludmila , Kadlecová, Andrea , Rubešová, Kateřina
Microstructure Analysis and Mechanical Properties of Low Alloyed Steel with Retained Austenite Obtained by Heat Treatment

Four different heating temperatures in the range of 770 °C – 950 °C were used for laboratory heat treatment of low carbon low alloyed steel. Chemical composition of the steel was based on the most common TRIP steel concept, only the silicon content was lowered to 0.6...

Kučerová, Ludmila , Zetková, Ivana , Jandová, Andrea , Bystrianský, Martin
Microstructural characterisation and in-situ straining of additive-manufactured X3NiCoMoTi 18-9-5 maraging steel

Additive manufacturing (AM) is an advanced technology used for the manufacture of products that have in-tricate shapes and complex inner geometries. Various metal powders can be used for AM; however, the resultingmicrostructures will differ profoundly from those obtained via the casting, hea...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 32