Browsing Ústav strojírenské technologie by Issue Date
Now showing items 21-40 of 40
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Determining Johnson-Cook Constitutive Equation for Low-Carbon Steel via Taylor Anvil Test
(MDPI, 2021-08-25)Tristal steel is low-carbon construction-type steel widely used in the automotive industry, e.g., for braking components. Given the contemporary demands on the high-volume production of such components, these are typically ... -
The Influence of Hot-Dip Galvanizing on the Mechanical Properties of High Strength Steels
(MDPI, 2021-09-10)Modern high-strength steels achieve their strength exclusively through the manufacturing process. Typically, hot-dip galvanizing is used to form a protective zinc layer on the steel parts of structures; nonetheless, the ... -
Possibilities of Porosity Repairs after Aluminium Alloys Welding
(Jan Evangelista Purkyne University in Usti nad Labem, 2021-09-18)This article describes problems of porosity which are caused after welding of aluminium alloys. The main part of this article is dedicated of methods of correction of porosities. The best correction is by welding or by ... -
Determination of Carbon Steel Dynamic Properties
(Jan Evangelista Purkyne University in Usti nad Labem, 2021-09-18)Taylor anvil test is one of the dynamic test method in which we can determine the dependences of strain, strain rate, temperature on flow stress. With this method, we can determine in each cross sec-tion or along axial ... -
Decalcification resistance of various alkaliactivated materials
(IOP Publishing, 2021-09-29)The resistance of alkali-activated materials (AAMs) to degradation processes, particularly the decalcification, was studied in this paper. The ground granulated blast furnace slag was alkali-activated using various activators ... -
Improving Rotary Draw Bending Process by Changing a Geometry of the Pressure Die
(Jan Evangelista Purkyne University in Usti nad Labem, 2021-10-01)The paper is focused on an analysis and optimization of the rotary draw bending process to eliminate bent tube ovality by modification of the pressure die geometry. The bending process is realized on Wafios CNC bending ... -
Vertical Graphene Growth on AlCu4Mg Alloy by PECVD Technique
(MDPI, 2021-10-02)Vertical graphene, which belongs to nanomaterials, is a very promising tool for improving the useful properties of long-used and proven materials. Since the growth of vertical graphene is different on each base material ... -
Heterogenous Weld of Heat Resistant Steel With Cobalt Alloy
(Manufacturing Technology, 2021-10-22)The article describes problems of welding heterogeneous welds be specific of heat resistant steel X15CrNiSi20-25 with cobalt alloy Stellite 6. Heterogeneous welds are produced by GTAW (141 according to standard EN ISO 4063) ... -
Successive Grinding and Polishing Effect on the Retained Austenite in the Surface of 42CrMo4 Steel
(MDPI, 2022-01-07)Low-alloy 42CrMo4 steels were studied by Fe-57 Mossbauer spectroscopy (MS), X-ray diffractometry (XRD), and Energy Dispersive X-ray Spectroscopy (EDS) measurements. The investigations were performed on metallographic ... -
Influence of Sub Structure Development within Rotary Swaged Al–Cu Clad Conductors on Skin Effect during Transfer of Alternating Current
(MDPI, 2022-01-15)The nature of alternating current transfer via metallic materials is specific, since the current density tends to be inhomogeneous across the cross-section of the conductor and the skin effect tends to occur. However, the ... -
Analysis of Surface State after Turning of High Tempered Bearing Steel
(MDPI, 2022-02-24)This paper investigates surface state after turning of the high tempered bearing steel 100Cr6 with a hardness of 40 HRC. White layer (WL) thickness and its microhardness, as well as surface roughness, are investigated as ... -
Optimizing Friction Stir Welding of Dissimilar Grades of Aluminum Alloy Using WASPAS
(MDPI, 2022-02-24)Aluminum is a widely popular material due to its low cost, low weight, good formability and capability to be machined easily. When a non-metal such as ceramic is added to aluminum alloy, it forms a composite. Metal Matrix ... -
Characterization of Microstructural Damage and Failure Mechanisms in C45E Structural Steel under Compressive Load
(MDPI, 2022-03-19)In this paper, the microstructural damage evolution of a steel with a ferrite-pearlite microstructure (C45E) was investigated during the process of cold upsetting. The development and the accumulation of microstructural ... -
Application of Carbon–Flax Hybrid Composite in High Performance Electric Personal Watercraft
(MDPI, 2022-04-26)Within the herein presented research, we studied the applicability of flax fabrics for composite parts in personal watercrafts in order to enhance damping of vibrations from the engine and noise reduction (which is relatively ... -
Requirements for Hybrid Technology Enabling the Production of High-Precision Thin-Wall Castings
(MDPI, 2022-05-26)Prototypes and small series production of metal thin-walled components is a field for the use of a number of additive technologies. This method has certain limits related to the size and price of the parts, productivity, ... -
Change in Dimensions and Surface Roughness of 42CrMo4 Steel after Nitridation in Plasma and Gas
(MDPI, 2022-10-06)The influence of plasma nitriding and gas nitriding processes on the change of surface roughness and dimensional accuracy of 42CrMo4 steel was investigated in this paper. Both processes almost always led to changes in the ... -
Possibilities of reducing the number of welds on rail vehicle doors
(Nature Portfolio, 2022-10-07)The paper developed methods that can be employed to reduce the number of welds on a specific rail-vehicle frame door welded from the EN AW 6060 aluminum alloy profiles thermally processed into the T66 state. The profiles ... -
Cutting Force When Machining Hardened Steel and the Surface Roughness Achieved
(MDPI, 2022-11-13)This article deals primarily with the problem of determining the cutting force when machining hardened steels. For this study, the steel used was 100 Cr6, number 1.3505. The secondary aspects of the study focused on the ... -
Precipitation of Sigma and Chi Phases in Cast Standard Duplex Stainless Steel
(POLSKA AKAD NAUK, POLISH ACAD SCIENCES, 2023-04-28)This work deals with the problem of intermetallic phases in cast standard duplex steel ASTM A890 Gr 4A (generally known as 2205). The investigated steel was subjected to isothermal heat treatment in the range from 595 °C ... -
The Influence of Foundry Scrap Returns on Chemical Composition and Microstructure Development of AlSi9Cu3 Alloy
(MDPI, 2023-05-03)Recycling is now, more than ever, an important part of any foundry process due to the high cost of energy. The basis of the work presented here is a study of the addition of foundry scrap returns to the melt in order to ...