Open Access Conference Proceedings

Abstract: Residual stresses in hot-rolled sheets complicate the process of laser cutting. The present paper is devoted to predict these stresses occurring during laminar cooling after rolling. [..] Read more

Abstract: The effects of rotational and travelling speeds and down force on the torque in Friction Stir Processing (FSP) process are presented. The relationship between the rotational speed and torque was modelled by an exponential function. [..] Read more

Abstract: Ferromanganese TWIP steels with the manganese content of 17-20 % are fully austenitic and non-magnetic, without phase transformation. Due to the application of the twinning mechanism the TWIP steels can satisfy numerous technical requirements for production of the new generation of cars. [..] Read more

Abstract: Universal plastometer Gleeble 3800, which is installed at the Regional materials science and technology centre at the VSB - Technical University of Ostrava was used for investigation of possibility of grain refinement of low-carbon steel. Through dilatometric tests of the investigated steel performed at various heating and cooling rates, the transformation temperatures Ar1, Ar3, Ac1 and Ac3 were determined. [..] Read more

Abstract: This paper describes a design procedure of cooling sections for the heat treatment of tubes. Two experimental stands used for cooling studies of steel samples were built at Brno University of Technology. [..] Read more

Abstract: During recent years, deformation technologies based on the severe plastic deformation (SPD) developed extensively. SPD methods are effective for refining microstructures of different materials, which lead to a significant improvement in strength properties. [..] Read more

Abstract: The paper focuses on rolling conditions, microstructure and mechanical properties of two different steel grades chose from the modern steel group called Advanced High Strength Steels (AHSS). The analysis carried out includes many tests and experiments such as: dilatometric and plastometric tests, Gleeble simulations of hot rolling, strip cooling after rolling and hot rolling of steel samples in laboratory conditions. [..] Read more

Abstract: During the thermal processes in metallurgy, it is important in many cases to know the exactly particularities of heat transfer in a complex system. In the case of steel semi-finished products heating, the most of the models refers to the heat exchange by convection and radiation or to the heat transfer by conductivity inside the material. [..] Read more

Abstract: Mechanical properties of closed die forgings reflect their microstructure which is formed during the manufacturing process. There are a number of process factors at play which govern the final microstructural condition of the forged part. [..] Read more

Abstract: The influence of intensive plastic deformation on compacted Al powders was evaluated. The samples subjected to deformation processing were prepared from powder particles with diameters between 25 and 45 μm, pre-compacted using double-step cold isostatic pressing (CIP) at 200+300 MPa applied for 30 seconds each and subsequently vacuum sintered at 500°C for 60 min. [..] Read more

Abstract: Plane strain and uniaxial compression tests are generally used for characterization of a material constitutive behavior during hot forming. Interpretation of the results obtained by such tests is complicated by flow inhomogeneity occurring in a specimen volume and temperature variations. [..] Read more

Abstract: An integral computer model/program for simulation of steels hot rolling on mill 2000 of SEVERSTAL was developed. The model provides for the following calculations: · temperature distribution over the cross section of a rolled strip at any location along its length; · rolling forces and torques;austenite microstructure evolution under hot rolling taking into account grain growth, dynamic/static recrystallization and strain induced carbonitrides precipitation; · austenite transformation during accelerated strip cooling at the run-out table accounting for formation of polygonal ferrite, pearlite, bainite of different morphology, and martensite; · mechanical properties of rolled strips (yield stress, ultimate tensile stress and relative elongation). [..] Read more

Abstract: Strains and stress conditions during shape rolling of experimental billets were analyzed. Photoplasticimetry, the theoretical basis of which is briefly described, was applied as the experimental evaluation method. [..] Read more

Abstract: The paper presents preliminary results of the studies of the aluminum alloy sheet formability in the process of Incremental Sheet Forming (ISF). For tests was used aluminum alloy sheet 2024 series. [..] Read more

Abstract: The paper presents results of numerical simulation of the asymmetric rolling process for band with shape ratio h0/D = 0.072 – steel grade S355J2G3. The study was conducted to determine the differences in the impact factor of different kinds of asymmetry on the band bending after leaving the deformation zone and the power parameters of rolling process. [..] Read more

Abstract: This paper deals with the evolution of plastic properties of steel wire for steel ropes during cold drawing. The evolution and final values of properties of drawn wire are dictated by the drawing process conditions. [..] Read more

Abstract: The effect of Thermomechanical Processing, using cold deformation with the combination of post deformation annealing and induction hardening based on the of dislocation structure inheritance effect on the strength, ductility, and torsion static strength has been studied. The metal with an initial structure of lamellar pearlite has shown to be more advantageous with respect to the strengthening intensity during cold rolling and the combination of mechanical properties after the TMP. [..] Read more

Abstract: Steel production is connected with high temperatures at which the steel reacts with oxygen in the surrounding atmosphere, creating scales on its surface. Scales are eliminated by row of high pressure flat jet nozzles. [..] Read more

Abstract: Dynamic recrystallization processes in heat-resistant Ni-based alloy was investigated depending on temperature, strain rate and deformation ratio. Recrystallization intensity is determined by the temperature and deformation conditions. [..] Read more

Abstract: Bimetals targeted for industrial applications are usually designed to combine the properties of two dissimilar metals, e. g. [..] Read more