The paper presents results of theoretical and experimental studies on the process of rolling bimetallic ribbed bars in the finishing pass. The work has determined the effect of the shape of oval preformed strip with a variable clad layer share on the distribution of clad layer thickness in bimetallic ribbed bars rolled in the finishing pass. The theoretical and experimental studies were carried out with the aim of determining the clad layer thickness that will ensure the appropriate corrosion resistance of finished product. A software application, Forge2007 , was used for numerical modeling.Keywords: FEM, bimetallic bars, steel-steel resistant to corrosion, hot rolling, numerical modelling, ribbed bars W pracy przedstawiono wyniki badań teoretycznych i doświadczalnych procesu walcowania prętów żebrowanych bimetalowych w wykroju gotowym. W pracy określono wpływ kształtu pasma owalnego przedgotowego o różnym udziale warstwy platerującej na rozkład grubości warstwy platerującej w prętach żebrowanych bimetalowych walcowanych w wykroju gotowym. Teoretyczne i doświadczalne badania przeprowadzono w celu określenia grubości warstwy platerującej zapewniającej odpowiednią odporność na korozję gotowego wyrobu. Do modelowania numerycznego wykorzystano program komputerowy Forge2007 .

In this paper, the results of plastometric and material studies on grade 2 titanium are presented. Cylindrical titanium samples were compressed at elevated temperatures on a Gleeble thermo-mechanical simulator. The process was captured in the form of stress-strain diagrams. Then, for the chosen-deformed samples, structural studies were performed on a digital light microscope. On the basis of the results, it was possible to determine the plastometric processing conditions that are most suitable for the fragmentation of the grains of the tested titanium. In order to find optimal processing parameters, it was also important to describe the plastometric process through the appropriate constitutive equations. Material constants in this equation were determined on the basis of a hyperbolic sinusoidal equation. This paper is part of a thematic issue on Titanium.

The paper presents the results of the study aimed at determination of plasticity of hard-deformed aluminium alloy grade 5019 in terms of parameters characteristic for the process of extrusion. The examinations were carried out in hot torsion test. Using the developed mathematical model of the analyzed alloy the mathematical modelling of torsion test was also performed.

The article presents results of physical modelling of processes of plastic working of the modified Zr-1%Nb zirconium alloy, obtained using different methods of the plastometric testing. The "Gleeble 3800" metallurgical process simulator, a DIL805 A/D dilatometer with a plastometric attachment, and a "Setaram" plastometer were used for testing. Based on the obtained testing results, the values of the yield stress and limiting plasticity of the tested alloy were determined for wide ranges of temperature variation (T =20÷950• C) and strain rate variation (ε =0.1÷15.0 s −1 ) under continuous loading conditions. It was found that by using different testing methods, different alloy properties, characteristic for a given plastic working process, could be obtained.Keywords: Zr-1%Nb, rods, tube, physical modeling, hot, cold deformation W artykule przedstawiono wyniki modelowania fizycznego procesów przeróbki plastycznej modyfikowanego stopu cyrkonu Zr-1%Nb, otrzymane za pomocą różnych metod badań plastometrycznych. Do badań zastosowano symulator procesów metalurgicznych "Gleeble 3800", dylatometr DIL805 A/D z przystawką plastometryczną i plastometr "Setaram". Na podstawie otrzymanych wyników badań określono wartość naprężenia uplastyczniającego i plastyczności granicznej stopu dla szerokiego zakresu zmian temperatury (T =20÷950• C) i prędkości odkształcenia (ε =0.1÷15.0 s −1 ), w warunkach obciążania ciągłego. Stwierdzono, że stosując różne metody badawcze można uzyskać inne własności stopu, charakterystyczne dla danego procesu przeróbki plastycznej.

In this article, we present research results on the closing conditions of internal metallurgical discontinuities during the hot elongation operation of a Zr-1%Nb alloy ingot using physical and numerical modeling. Research on the influence of thermal and deformation parameters of elongation operations on the rheological behavior of a Zr-1% Nb alloy was conducted using the Gleeble 3800 metallurgical process simulator. Modeling of the influence of thermal–mechanical parameters of hot elongation operations in combinations of rhombic and flat anvils on the closure of metallurgical discontinuities was performed with the help of the FORGE®NxT 2.1 program. Based on the results of the research, recommendations were made regarding forging elongation technology and the geometry of working tools in order to ensure the closure of metallurgical discontinuities during hot elongation operations of Zr-1% Nb alloy ingots.