Open Access Conference Proceedings

Abstract: The aim of the study was to investigate the possibility of a partial upgrade of the existing technological line at the company Calumite s.r.o., intended for the treatment of blast furnace slag for its secondary use. The first step was detailed characterization of the materials by means of mechanical-physical parameters, among which are, for example, the particle size distribution, compressibility, and the angle of internal and external friction. [..] Read more

Abstract: Last year we presented the mathematical model of the motion of burden materials in the bell-less blast furnace top of the type Paul Wurth or Vitkovice. The article from previous year concerned namely with one phase of the motion - motion at the rotating chute. [..] Read more

Abstract: In the steel industry, requirements for production optimization by the help of decreasing of energy and economical demands are increasing at the production of alloyed steels in the EAF. During the treatment of alloyed steel charging in the EAF containing chromium, its loss by oxidation and by the transition into slag happens. [..] Read more

Abstract: The paper is devoted to the study of the influence of experimental conditions of the direct thermal analysis method for use in high-temperature thermal analysis equipment Netzsch STA 449 F3 JUPITER during controlled cooling mode.The first part of the article is focused on monitoring of the effect of experimental conditions on the solidification point of the standard material nickel (a purity of 99.995 %) and the total shape of cooling curve. On the basis of experimental measurements, a deviation obtained by interpreting the cooling curves for various cooling rates (5; 10; 15 and 20 °C min-1) for nickel samples of various weights (5; 10; 15 and 20 g) from the generally recognized melting / solidification point of nickel (1455 °C) can be quantified.Besides the identification of the influence of experimental conditions on the temperature of solidification and the total cooling curve of nickel shape during solidification, the paper focuses attention on the mapping and interpreting the response found during the solidification of steel sample and the resulting to liquidus (TL) and solidus (TS) temperature of this steel. [..] Read more

Abstract: The two-dimensional task of isothermal rolling of aluminum sheet in the superplasticity conditions realized with a low angle of nip is considered. The solution of the task is based on the well-known mechanisms of the plastic flow in the wedge-shaped convergent canal. [..] Read more

Abstract: The paper is aimed on appraisal of influence of preceding deformation on spring steel CCT diagrams, which were created on the basis on dilatometric analyses of cooling curves, using universal plastometer Gleeble 3800, CCT and DCCT diagrams after austenitisation at the temperature of 850 °C, which were further supported by metallographic analyses and hardness measurements HV30. Dilatometric tests were performed at different cooling rates in the range from 0.16 to 12 °C/s. [..] Read more

Abstract: The bore expansion test represents one of basic technological tests for determination preparation technologies influence on the maximal strain value. The most frequently it is used to determine material limit stage at comparison blanking and e.g. [..] Read more

Abstract: During the last years there is a strong tendency of automotive industry to achieve suitable compromisebetween effort to lower environmental load at car operation by lowering its weight (thus to lower thickness of used parts) and on the other hand there is tendency to still increase the safety of passengers by utilization ultra-high strength materials. That is why these days are more and more important strength materials and alloys based e.g. [..] Read more

Abstract: The paper is focused on investigation of the deformation behaviour of two nickel alloys - IN 713 LC and MAR M-247, delivered in the as-cast state. The aim was to determine physically the nil-strength temperatures and on the basis of tests by uniaxial tension to create 3D maps of plastic and strength characteristics of both these alloys. [..] Read more

Abstract: Uniaxial hot compression tests performed on a HDS-20 Hot Deformation Simulator were utilized to compare the influence of niobium amount on hot flow stresses of these steels. For both steels, the temperature range from 700 °C to 1200 °C in combination with the nominal strain rate range from 0.1 s-1 to 100 s-1 were investigated. [..] Read more

Abstract: Development of materials with ultra-fine-grained structure belongs at present to the front-end areas of research of materials and forming technologies in the whole world. Nano-structural materials in mechanical engineering, metallurgy, automotive, military and aerospace industry are applied. [..] Read more

Abstract: These days there can be observed still increases requirement about products quality at keeping low price level. Such contending claims of market environment force producers in every branch of engineering industry to innovate their technological procedures and to process new progressive materials with specific utility properties. [..] Read more

Abstract: Knowledge of deformation limit states is the basic presumption for the proposal of all forming operations at stampings production. Deformation limit states of given material are greatly influenced by forming temperature, stress state and strain rate. [..] Read more

Abstract: This paper presents results of the examinations aimed at determination of the best controlled cooling conditions for wire rod with diameter 16.5 mm. The examinations were carried out for 20MnB4 steel grade for cold upsetting.The first stage of the research was analysis of currently used wire rod rolling and cooling technology, with particular focus on controlled cooling process based on Stelmor technology. [..] Read more

Abstract: A model of prediction of flow stress during hot rolling plates and wide strips of carbon, low alloy and micro-alloyed steels, especially deformation resistance which are not yet known, was developed. Method of L. [..] Read more

Abstract: The paper presents results of steel 23MnB4 and C70 plasticity tests meant for rolling wire rods on modern continuous rolling mill. Plasticity assessment was conducted in hot torsion test performed on swing plastometer in temperature range of rolling wire rode from 850 to 1150°C and deformation speed of 0.1; 1 and 10 s-1. [..] Read more

Abstract: The paper presents results of research concerning the impact of different values of friction coefficient on pressure during an uniaxial compression test. The study was conducted using a simulator of metallurgical processes Gleeble 3800 located at the Institute of Metal Forming and Safety Engineering in Czestochowa University of Technology. [..] Read more

Abstract: The aim of this paper is to determine the impact of heat treatment of steel pre-treated thermo-mechanically using Gleeble 3800 simulator on the structure and mechanical properties of investigated high-manganese austenite Fe-Mn-(Al, Si) steel, containing 25% of Mn, 3% of Si, and 3% of Al. Applying thermo-mechanical treatment using Gleeble 3800 simulator allow to obtain the conditions for a gradual grain refinement controlled mainly by dynamic recrystallization and also by a dynamic recovery in a whole temperature deformation range. [..] Read more

Abstract: The paper presents analysis of plasticity characteristics and microstructure of magnesium alloy type WE43 with yttrium, zirconium and rare earth elements. Susceptibility of magnesium alloy to cracking in high temperatures was tested on Gleeble3800 simulator. [..] Read more

Abstract: The paper presents the results from experimental studies of combined extrusion of ENAW-1050A alloy parts. The studies were divided into three stages depending on the relative strain value of the material extruded in forward direction, ε1: 0.77, 0.69 and 0.59. [..] Read more