Authors

The Microstructure and Properties of Materials at the Fusion Line
abstract, article page 13 - 18 pdf - 152 kB

The Influence of Simulated Thermal Cycle on the Formation of Microstructures
of Multi-Pass Weld Metal abstract, article page 19 - 24 pdf - 160 kB

V. Gliha - The Microstructure and Properties of Materials at the Fusion Line

    In this paper, the formation of the HAZ that is caused by the thermal effects of welding is investigated from the theoretical and experimental points of view. Samples of the material found at the fusion line were prepared by simulating the thermal regimes that occur during welding. A number of CCT diagrams that are valid for the conditions during welding were designed, and the hardness and impact-toughness of the samples were measured. This information was then related to the results of metallographic examinations. The maximum temperature and the cooling rate of the applied thermal cycles were found to be decisive in terms of the properties of the HAZ.pdf - 152 kB

D. Rojko, V. Gliha - The Influence of Simulated Thermal Cycle on the Formation of Microstructures of Multi-Pass Weld Metal

     In the present work was analysed the influence of weld thermal cycle on the microstructural changes in weld metal by use of the simulated microstructures. We examined the kinetics of the formation of austenite from the starting microstructure. The simulated microstructures were prepared by the application of simulated thermal cycles with different peak temperatures on a sample of real single-pass weld metal. The reproduction of thermal cycles were carried out by the SMITWELD simulator. Special attention was dedicated to the influence of thermal cycle on the formation of microstructures, which can be potential triggers of brittle fracture (local brittle zones). pdf - 158 kB

G. Banaszek, A. Stefanik, S. Berski - Computer and Laboratory Modelling of the Analysis of Closing up of Metallurgical Defects in Ingots During Free Hot Forgings

    Computer modelling using a FEM-based program, Forge 2DŇ, was carried out in the study. The influence of die shape and the main parameters of the forging process on closing up of metallurgical defects were determined. pdf - 160 kB

K. Laber, H. Dyja, D. Rydz - Analytical and numerical methods of determining the distribution of temperature of air-cooled strip

    The paper analyzes the distribution of temperature of 60S2A steel strip cooled in air. Both analytical and numerical methods were applied in investigation. From among the known analytical methods of temperature distribution determination, Tselikov’s [1], and the Fourier’s [2] methods were used. The numerical examination of temperature distribution presented in the paper involved carrying out a computer simulation of strip air cooling. For this purpose, the Forge 2D software [3] was employed, which relies on the finite-element method in performing computations. Comparison of results obtained by analytical methods with numerical computation results and for the real technological process has also been made within the study. pdf - 160 kB

G. Kosec, L. Kosec, V. Gontarev, B. Kosec, M. Bizjak, I. Anžel - Internal Oxidation of Silver Alloys with Tellurium, Selenium and Sulphur

    Silver alloys with tellurium, selenium and sulphur fulfil the conditions for the internal oxidation. Microstructure of these alloys consists of matrix (dilute solid solution) and particles of intermetallic compounds. Internal oxidation of ternary alloys is very similar to that of the binary alloys, but there are also distinctions in thermodynamics properties of alloying elements.
At the direct oxidation of the particles of the intermetallic compound the phenomena of the selective oxidation was observed. Concentration of more reactive elements is increasing in the oxidized part of the particles of the intermetallic compound (Te in AgTeSe alloys). Therefore the precipitated oxides formed with diffusional internal oxidation are richer with less reactive alloying element (Se in AgTeSe alloy). In the precipitated oxide particles the concentration of selenium is more than twice higher than of tellurium. pdf - 160 kB

K. Gawdzińska, M. Maliński - Study of reinforcement elements distribution exemplified by composite with AlSi11 matrix and carbon reinforcement

     Studies of the distribution of reinforcement structure elements in metal matrix composite materials on the basis of microscopic images and mathematical description have been presented. pdf - 144 kB

T. Kvačkaj, V. Vrchovinský, I. Pokorný, I. Mamuzić - Nanostructural Formation by Severe Plastic Deformation

   The influence of severe plastic deformations on structural, mechanical and plastic properties of ARMCO-Fe in equal-channel angular pressing procedure was investigated. Mathematical simulations of stress and temperature fields were applied, too. pdf - 680 kB

R. Budzik, A. Pyrikow- Metallurgical Properties of Iron Sinters Obtained on the Sinter Belt with Air Overpressure

   Feeding additional overpressure air to the sinter belt surface results in an increase in the output of the sinter belt. Iron sinters obtained by this technology are characterized by better strength properties; also, an effect of fed air overpressure on sinter quality has been found in tests. Feeding compressed air to the sinter belt is one of the methods of intensifying the iron ore sintering process. pdf - 68 kB

C. Kolmasiak, R. Budzik, W. Pardela - Elements of Steering and Quality Management in Integrated Computer System of Metallurgical Enterprise

   The advanced information technology is presently used on almost all levels of the management of an enterprise. Most often, it functions in the form of modern information systems, a main component of which is a master enterprise management system and its assistant specialized information system targeted to servicing information & decision-making processes controlling the enterprise’s business activity. The article presents the assessment of a computer management-aiding system and a quality assurance system in one of Poland’s largest metallurgical enterprises. pdf - 68 kB

W. Waszkielewicz, R. Prusak, R. Budzik - The Increasing of Metallurgical Enterprise Elasticity by Using Polyvalence Skills of Workers

   Present market situation forces metallurgical enterprises upon continuous adapting to new trends. Therefore, every enterprise must have disposable workers with wide competences who are able to qualitatively realize different kind of tasks. With workers of that type enterprises are able quickly to initiate new solutions. This also makes possible formation of the structure of employment with laborers existing on internal market without necessary frequent, capital- and time-consuming looking for help on external market. In this paper a method of kilter of workers skills by constructing and using polyvalence training system is presented. pdf - 76 kB

Z. Skuza, R. Prusak, W. Waszkielewicz - The Possibility of Qualitatively and Quantitatively Adaptation Human Resources on the Example of Chosen Unit of Metallurgical Enterprise

  One of basic tasks of human resource management in a metallurgical enterprise is assurance of workers with correct - from organization point of view - competences. These activities are possible only when competences needed in the enterprise are recognized and the influence of particular competences on correct course of manufacturing process is described. This enables the enterprise to have an access to exact qualification of workers’ profiles which should be applied on stage of selection. In this paper, on the example of chosen unit of metallurgical enterprise, methods possible to use in human resource management are presented. pdf - 68 kB