Open Access Conference Proceedings

Abstract: Thermo-analytical methods are commonly used for phase transformation temperature identification in a lot of science and industrial applications. Currently, there are most frequently methods based on very small samples analyses like a differential scanning calorimetry (DSC) and/or a differential thermal analysis (DTA) realised for various materials mostly in combination with a thermo-gravimetry (DSC/TG; DTA/TG respectively). [..] Read more

Abstract: Metallurgical processes of steel production are strongly connected with knowledge of the thermo-physical and thermodynamic properties of liquid metal during individual technological steps. Critical factors describing behaviour of steel in the process of its solidification and then important to a correct setting of conditions of steel casting and solidification of steel, which significantly affect the final quality of the as-cast steel, are liquidus (TL) and solidus (TS) temperatures.Experimental determination of these temperatures (or generally additional phase transformation temperatures) can lead to the refinement of all these phase transformation temperatures as well as to a more precise determination of the interval of steels’ solidification. [..] Read more

Abstract: Currently, model study is commonly used part of research in field of metallurgical processes. Process of simulation of casting and solidification of steel ingots is no exception. [..] Read more

Abstract: The article presents research results performed to determine the size and shape of non-metallic inclusions, on different steel production stages, for steel grades intended for long products. The tests were carried out under industrial conditions during normal production cycle, while casting of carbon steel groups. [..] Read more

Abstract: In modern metallurgical processes, the mixing of a metal bath is a basic operation that allows achieving a state of close chemical and thermal homogenization of liquid steel after the insertion of the alloy addition. Mixing also increases the efficiency of removing non-metallic inclusions. [..] Read more

Abstract: The manufacturing of high quality steels is connected to high temperatures at which the material reacts with the surrounding atmosphere. A layer of iron oxides (scales) is formed on the surface of the steel. [..] Read more

Abstract: Cutting is one of the most frequently carried out metal forming processes. One of the basic parameters of this process is the clearance value. [..] Read more

Abstract: The method of determining the tendency to galling in microforming processes is introduced. The method consists in the drawing process of the strip with a width of 1-3 mm and a thickness of 0.3-1 mm using a cylindrical tool with a radius of 2.5 mm. [..] Read more

Abstract: Deformation behavior of continuously cast steel with 0.43 % C, 1.01 % Cr and 0.19 % Mo was studied in the austenite region. Its solidus temperature was calculated as 1435 °C and the nil strength temperature at heating was determined as 1402 °C using a special testing method. [..] Read more

Abstract: The paper investigates the influence of hot-working parameters on the course of thermally activated dynamic and static processes in HSLA (High Strength Low Alloy) constructional steel, containing 0.17 % C, 1.37 % Mn and microadditions of Nb, Ti, V in the amounts of 0.025 %, 0.004 % and 0.019 %, respectively. In order to determine the stess - strain curves and the kinetics of recrystallization of plastically deformed austenite, the Gleeble 3800 thermomechanical simulator was used. [..] Read more

Abstract: Reversible two-stand two-high laboratory mill TANDEM was used to study the effect of simulation parameters on the final properties of HSLA steel strip with 0.08 % C, 1.26 % Mn, 0.05 % Ti and 0.03 % Nb. The flat samples were heated at 1230 °C for 20 or 60 minutes and rolled from thickness of 24.0 mm to 3.2 mm by 6 passes. [..] Read more

Abstract: The peak point coordinates (i.e. peak stress, peak strain) play a significant role in case of a flow curve description. [..] Read more

Abstract: The paper presents computer modelling and experimental results of investigations on pushing through a conical die process of round bars. The calculations were carried out using the commercial code QFORM-2D, based on the Finite Element Method (FEM). [..] Read more

Abstract: This paper deals with optimization of roll cooling during hot rolling of tubes in stretch reducing mill (SRW) in Železiarne Podbrezová. Temperature of the tube after rolling in SRW should be higher than Ar3 as much as 30 - 50 °C. [..] Read more

Abstract: The high-strength steels and tailor welded blanks (TWB) are applied in construction of cars parts to reduction of cars weight [1, 2]. The application of these materials brings possible complicatons during the forming when it proves the considerable influence of stress-strain characteristics differences of the individual parts of TWB what result in non-constant material flow and consequently a negative movement of the weld interface [3, 4]. [..] Read more

Abstract: This article is focused on analysis of state formation which influences the tubes production process from austenitic stainless steels with diameter 0.34 mm in a negative way. The problems have been concentrated on factors monitoring which affect the drawing process stability of seem tubes where the desired final dimensions – a diameter 0.34 mm and a wall thickness 0.057 mm have been limited factors. [..] Read more

Abstract: Limit values of the normalized Cockroft – Latham criterion for different range of temperature and strain rates may be determined by using the comparative method for the uniaxial tensile test of notched specimens. Uniaxial tension of notched specimens was performed on a multi-function metallurgical process simulator, Gleeble 3800. [..] Read more

Abstract: The cold drawn wires are used to spring manufacturing in automotive and whiteware equipment. The most important mechanical properties of the wire used in spring production are tensile strength and minimum number of twists in the torsion test. [..] Read more

Abstract: The zinc coating both increases the corrosion resistance and lubricated to minimize the friction for subsequent diameter reduction steps. The course of the reaction between the steel surface and the molten zinc depends upon the formation and growth of the iron-zinc alloy layers. [..] Read more

Abstract: The sheet metal pressing structures produced by hydromechanical forming of nickel superalloys were analyzed to determine effect of plastic deformation on the structure and mechanical properties of finished products. The Inconel 625 nickel-alloy sheet metal was extruded with liquid in the form of cones. [..] Read more