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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 92
Jeníček, Štěpán , Opatová, Kateřina , Kučerová, Ludmila , Vorel, Ivan
The Progress of Bainitic Transformation during Austempering in Connection with the Alloying of Unconventional AHS Steels

It is well known that incomplete bainitic transformation during austempering treatment is mainly caused by the supersaturation of austenite with carbon. Such supersaturated austenite becomes more stable and further stabilization is led by silicon alloying. Stable austenite does not transform and&...

Kučerová, Ludmila , Jeníček, Štěpán , Zetková, Ivana , Burdová, Karolína
Heat treatment of bimetals produced by selective laser melting of MS1 maraging steel on conventionally produced 42SiCr martensitic steel

One approach to producing hybrid bimetallic parts is to additively manufacture a new material onto a conventionally manufactured base material. This technique can expand the potential applications of additive manufacturing and offer new solutions for the engineering design of hybrid parts. I...

Kottner, Radek , Sedláček, František , Jahodník, Ondřej
Stabilizing legs with possibility of loss of stability to protect glass fibre reinforced polymer tank

This work focuses on the optimization of the stabilizing legs of a Glass Fibre Reinforced Polymer under- ground tank. More specifically, the aim was to find a structure of the legs that compensates for the pos- sible failure of the tank when it is filled after being&...

Kučerová, Ludmila , Burdová, Karolína , Jeníček, Štěpán , Volkmannová, Julie
Microstructure and Mechanical Properties of 3D Printed Tool Steel after Various Precipitation Hardening Treatments

Precipitation hardening is one of the most frequently used methods of the post-processing heat treatments of 3D printed tool steel 1.2709, as it increases the yield and ultimate tensile strengths of the steel. Within this work, the broad temperature range of 250°C – 550°C was&...

Hájek, Jiří , Nový, Zbyšek , Kučerová, Ludmila , Jirková, Hana , Salveter, Pavel , Motyčka, Petr , Hajšman, Jan , Bystrická, Tereza
A New Alloying Concept for Low-Density Steels

This paper introduces a new alloying concept for low-density steels. Based on model calculations, samples—or “heats”—with 0.7 wt% C, 1.45 wt% Si, 2 wt% Cr, 0.5 wt% Ni, and an aluminium content varying from 5 to 7 wt% are prepared. The alloys are designed to obtain st...

Jirková, Hana , Opatová, Kateřina , Kučerová, Ludmila , Zetková, Ivana , Jeníček, Štěpán , Burdová, Karolína
Effects of heat treatment on microstructural evolution in additively-manufactured parts of various heights from maraging steel

Parts made by 3D printing must be subjected to heat treatment to achieve the required mechanical properties. With the development of additive manufacturing in various areas of industry, more and more complex components are being printed, which, in addition to their complicated shape,&#x...

Lee, Seungjong , Shao, Shuai , Wells, Douglas N. , Zetek, Miroslav , Kepka, Miloslav , Shamsaei, Nima
Fatigue behavior and modeling of additively manufactured IN718: The effect of surface treatments and surface measurement techniques

In this study, the effect of various surface treatments, including sand-blasting, drag-finishing, turning, grinding, and grinding + drag-finishing, on surface roughness (SR) and fatigue properties of laser beam powder bed fused Inconel 718 was examined. SR values obtained from two surface me...

Kučerová, Ludmila , Račický, Antonín , Tichá, Iveta
Analysis of Affected Surface Zone Created by Different Cutting Technologies

Three cutting technologies, plasma, laser, and acetylene, were used to produce the same geometry of a hole with 33 cm diameter. The plates of the same steel St-37 (1.0038, ČSN 11375) with a thickness of 50 mm were used in all three cases and the aim of the ...

Dittrich, Fabian , Kars, Jonny , Mašek, Bohuslav , Jeníček, Štěpán , Wagner, Martin Franz-Xaver , Mayr, Peter
HAZ characterization of welded 42SiCr steel treated by quenching and partitioning

An experimental steel 42SiCr was heat treated with a quenching and partitioning treatment in order to achieve high strength and at the same time acceptable ductility. This crucial combination requires the formation of a martensitic microstructure with a small volume fraction of retained...

Kučerová, Ludmila , Chena, Iveta , Stehlík, Adam
Effect of various heat and thermo-mechanical treatments on low alloyed CMnAlNb high strength steel

Low carbon low alloyed high strength steel with the chemical composition suitably designed to support the stabilization of retained austenite was used in this work. The steel was processed by conventional annealing for a reference and several different heat and thermo-mechanical treatments&#...

Zoubek, Michal , Poór, Peter , Broum, Tomáš , Basl, Josef , Šimon, Michal
Industry 4.0 Maturity Model Assessing Environmental Attributes of Manufacturing Company

The primary purpose of this article is to present a maturity model dealing with environmental manufacturing processes in a company. According to some authors, Industry 4.0 is based on characteristics that have already been the focus of “lean and green” concepts. The goal of th...

Hajšman, Jan , Kučerová, Ludmila , Burdová, Karolína
The Influence of Varying Aluminium and Manganese Content on the Corrosion Resistance and Mechanical Properties of High Strength Steels

The aim of this paper is to evaluate the influence of small variations in chemical composition on the corrosion resistance and mechanical properties of low-manganese and medium manganese high strength steels. Six different steels with manganese content varying from 1.5 to 4.0 wt.% ...

Kepka, Miloslav , Kepka, Miloslav
Consideration of random loading processes and scatter of fatigue properties for assessing the service life of welded bus bodyworks

As in the field of passenger cars, the development of a new bus (trolleybus, electric bus) includes computational and experimental activities: CAD - MBS - FEM - stand tests - measurements with prototypes - fatigue life calculations. Current challenges include the rise of electromob...

Kovanda, Jan , Rulc, Vojtěch
Pre-crash control strategy of driver assistance system

The aim of the article is the optimisation process of the ADAS (Advanced Driver Assistance Systems) control. The methodology is based on the classi-fication of ADAS systems according to the situations of unavoidable accidents. Theevaluation of expected consequences uses injury biomechanics, ...

Jirková, Hana , Jeníček, Štěpán , Kučerová, Ludmila , Kurka, Petr
High-strength steel components produced by hot metal gas forming

Advanced high strength steels are promising materials for a variety of applications. They can be used in the automotive industry to reduce the car body weight, and thus the fuel consumption as well. Very good mechanical properties can be obtained in martensitic steels by the&#...

Kučerová, Ludmila , Burdová, Karolína , Jeníček, Štěpán , Chena, Iveta
Effect of solution annealing and precipitation hardening at 250 °C -550 °C on microstructure and mechanical properties of additively manufactured 1.2709 maraging steel

Post-processing heat treatment of additively manufactured (AM) maraging steel is an important issue in the tailoring of the final mechanical properties of a product. Up to now, mainly precipitation hardening at temperatures of 450 °C–500 °C has been studied either in as-built or so...

Kučerová, Ludmila , Zetková, Ivana , Jeníček, Štěpán , Burdová, Karolína
Production of Hybrid Joints by Selective Laser Melting of Maraging Tool Steel 1.2709 on Conventionally Produced Parts of the Same Steel

Joining additively manufactured (AM) complex shaped parts to larger conventionally produced parts can lead to innovative product designs. Another alternative is direct deposition on a conventional semi-product. Therefore, similar joints of maraging tool steel 1.2709 were produced by AM deposition ...

Rubešová, Kateřina , Peković, Michal , Jirková, Hana , Hradil, David
Resistance of tool steel processed by unconventional forming technology against abrasive wear

Materials for parts which are subjected to abrasive wear in service are typically selected on the basis of the microstructure type and hardness. Additional characteristics, such as grain size and the size and morphology of carbides are considered less frequently, although they may ...

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&#...

Vychytil, Jan , Špirk, Stanislav
Numerical analysis of passenger kinematics and injury risks during a railway vehicle collision: The effect of safety belts

In conventional steels, bainitic microstructure which forms under isothermal conditions consists of bainitic ferrite and carbide precipitates whose distribution and size substantially depend on the parameters of isothermal treatment. In CFB steels (Carbide Free Bainite) however, the main microstructural&#x...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 92