Today, high-strength parts for the automotive industry are mainly produced by the press-hardening technology. In order to reduce costs, savings in production and optimal materials are sought. One option involves the use of high strength steels of various chemical compositions. Two high ...

Enrichment of austenite with carbon in the course of austempering is a fundamental mechanism which leads to incomplete bainite transformation. Higher carbon content in untransformed austenite, together with the presence of silicon, is understood to lead to stabilization of austenite. As a&#x...

This paper deals with the innovative Quenching and partitioning (QP) heat treatment (HT) of low-alloyed chromium steel, and is especially focused on the higher temperatures of partitioning as well as longer holding times and its influence on mechanical properties of the material. As...

Good mechanical properties of steels, in which appropriate heat treatment can produce mixed hardening structures, make them candidates for a broad range of applications, namely in the automotive industry. TRIP steels (in which transformation-induced plasticity operates) with a carbon content of&#...

Hybrid parts were successfully produced by additive manufacturing of maraging steel 18Ni 300 grade on the top of low alloyed advanced high strength steel. High strength steel was alloyed by 0.2% C, 1.5% Al, 0.5% Si, 1.5% Mn and micro alloyed by 0.06% Nb (all in weigh...

The article describes the research and development of a traction, rotating bogie for a low-floor tram. It draws attention to problems that had to be resolved during development.

The paper is focused on age related changes regarding motor abilities and forces. The paper briefly reviews proposed methodology and measuring procedures. The fine fingers dexterity was measured by Purdue Pegboard Test and Grooved Pegboard Test. For hand dexterity the Complete Minnesota ...

Requirements for measurement accuracy are constantly increasing, as are the requirements for evaluating quantifiablecharacteristics measurement systems. Among engineering fields, the highest requirements are placed on measuring systems in the automotive and aerospace industries. Specialized automatic control and...

Frequently discussed topic related to the modern trend of Industry 4.0 is the issue of virtual commissioning. This paper focuses on the development of a virtual model (the so-called digital twin) of a real heavy machine tool. In the field of heavy machine tools, this topi...

EPS Geofoam is an appropriate lightweight material for reducing dead load of road embankments and hence, mitigating settlements of pavements constructed over poor ground conditions. Although, it has been used successfully in many projects during the last 50 years, there are still drawba...

In this paper, a series of plate load tests on a sandy soil bed containing multiple layers of granulated rubber-soil mixture (RSM) under incremental cyclic loading was performed. Incremental cyclic loading in five steps with amplitudes of 140, 280, 420, 560 and 700 kPa were&#x...

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 the passenger safety which will improve by the use of...

Deformation-induced martensitic transformation is used for improving mechanical properties of AHS steels which contain metastable retained austenite. TRIP steels are one of the categories that fall into this group. Their microstructures consist of proeutectoid ferrite, bainite, and metastable retained ...

The fatigue lifetime of the structure in operation is express in the number of working cycles, kilometersor time depending units. By harmonic process of loading is possible to express the safety margin as reserve against the required lifetime in the form of number cycles or&#x...

The development of measurements and the evaluation of the surface structure has been marked by significant qualitative technical progress in recent years. Leading manufacturers of measuring technology (Hommel CS s.r.o., Carl Zeiss, Ltd., etc.) actively responded to new requirements. The developme...

The article analyses unconventional technology of water jet cutting and its impact on the cutting quality. A series of experiments were done to determine the effects of the used materials and their cut thickness on the final surface integrity, within the experimental program. Steel...

The main aim of this paper was to describe the viscosity and injection mold filling behavior of PA6 with 15% of glass fibers. Injection molding is one of the most widely used processes for polymer products. The quality of these products is directly linked to correct ...

This contribution is focused on the passive safety of the railway vehicles interiors. The passive safety has become a new area of the rail vehicles design. In the field of rail vehicles interior passive safety the computer simulations are most widely used. The computer simulat...

Thermal loading of mechanical forging press is one of the most important factors which are influencing its function and final accuracy of forgings. It is necessary to eliminate deformations caused by thermal loading of all main parts such as ram and frame. This is done ge...

To improve the mechanical properties of high strength steels the application of innovative methods is often necessary. One of such technology used in the field of heat treatment (HT) is the quenching and partitioning process. By this method higher content of stabile retained austen...