Z A G R E B
October / December
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Original Scientific Paper
Preliminary Note
Review
Review Paper
Professional Paper
ARCHIVE 1996 - 2007
46.
year issue
Metalurgija - Journal for Theory and Practice in Metellurgy
Metallurgy 76 (84) pages
pdf - 20324 kB
ISSN 1334-2576    UDC: 669+621.7+51/54(05)=163.42=111     METABK: 46 (4) 225-304 (2007)

Authors
Original Scientific Paper
M. Warzecha,
J. Jowsa,
T. Merder

Gas Mixing And Chemical Homogenization Of Steel In 100 T Ladle Furnace
 abstract, article page 227 - 232 pdf - 1857 kB
V. V. Buchanovsky,
I. Mamuzić,
E. P. Polishuk

The Effect of Heat Treatment on Mechanical Characteristics and Nature of Failure of Sheet Molybdenum Alloys
abstract, article page 233 - 236 pdf - 523 kB

T. Vuherer,
A. Godina,
Z. Burzić, V. Gliha
Fatigue Crack Initiation from Microstructurally Small Vickers Indentations
abstract, article page 237 - 243 pdf - 1046 kB
T. Merder,
A. Bogusławski,
M. Warzecha
Modelling of Flow Behaviour in a Six-Strand Continuous Casting Tundish
abstract, article page 245 - 249 pdf - 931 kB
G. Stepanov,
I. Mamuzić,
A. Babutsky
An Increase of Impact Toughness of Low-Carbon Steel Caused by Impulse Electric Current Treatment
abstract, article page 251 - 253 pdf - 285 kB
Z. Wencel, R. Budzik,
R. Križanić,
C. Kolmasiak
The Synergy of the Surface Layer after Carburizing of Tool Steel as a Measure of Operational Quality
abstract, article page 255 - 260 pdf - 1555 kB
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Preliminary Note
Z. Pędzich,
K. Gawdzińska,
E. Pamuła
Flaws Description in AlSi11 Alloy-Based Composite Fibres Reinforced Casts
abstract, article page 261 - 265 pdf - 784 kB
I. Mamuzić,
F. Trebuňa, M. Buršák,
J. Tomčík
Investigation of Reasons and Possibility of Parameters Elimination Influencing Cracking of Leaf Springs on Continuous Casting Machine
abstract, article page 267 - 271 pdf - 882 kB
V. Jovišević,
M. Soković, B. Kosec
Introduction of Explosive Cladding Technology for the Manufacturing of Hydraulic Cylinders
abstract, članak str. 273 - 276 pdf - 647 kB
M. Buršák,
I. Mamuzić
Fatigue Properties of Galvanized Higher-Strength Steel Sheets
abstract, article page 277 - 280 pdf - 357 kB
A. M. Gałkin,
A. Rzšsowska -
Przala, A. Górniak
A New Method of Manufacturing Small-Diameter Bars and Tubes from Hardly Deformable Steels in Skew Rolling
abstract, article page 281 - 284 pdf - 448 kB
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Review Paper
M. Holtzer, J. Dańko,
R. Dańko
Possibilities of Formation of Dioxins and Furans in Metallurgical Processes as well as Methods of their Reduction
abstract, article page 285 - 290 pdf - 516 kB
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Professional Paper
J. Črnko, P. Jelić,
L. Lazić, M. Kundak
Operation Indicators of the Rotating-Hearth Furnace in Restrictive Manufacturing Conditions
abstract, article page 291 - 293 pdf - 328 kB
J. Holisz-Burzyńska,
E. Staniewska,
R. Budzik
The Physical Flow of Materials and the Associated Costs in the Production Process of a Rolling Mill
abstract, article page 295 - 299 pdf - 401 kB
R. Budzik,
A. Pirikow
Sintering of Ore Mixes Containing Iron Concentrates of a Low SiO2 Concentration of Below 1,0 %
abstract, article page 301 - 303 pdf - 371 kB
Top of Page
 Original Scientific Paper

M. Warzecha, J. Jowsa, T. Merder - Gas Mixing And Chemical Homogenization Of Steel In 100 T Ladle Furnace

      The article presents numerical simulations of fluid flow and chemical homogenization of liquid steel in gas-stirred ladle with two asymmetric porous plugs. In this study mixing time is analyzed as a function of porous plug location. All calculations were carried out by commercial computer program Fluent using k-ε turbulence model. Results show the velocity vectors of liquid steel and tracer concentration field after alloy addition. Numerical calculations were used to get the mixing time of liquid steel as a function of gas flow rate and porous plugs location.
pdf - 1857 kB

V. V. Buchanovsky, I. Mamuzić, E. P. Polishukć - The Effect of Heat Treatment on Mechanical Characteristics and Nature of Failure of Sheet Molybdenum Alloys

   The annealing temperature within the range of 1223 - 2273 K has been studied for its effect on the grain size, mechanical properties, cold brittleness temperature, and nature of failure of sheets molybdenum alloys TsM-6 and TsM-10. The method of Auger-electron microscopy has been used to study the change of carbon and oxygen content on grain boundaries of the alloy TsM-10 and the change of mechanical properties associated with it as dependent on the annealing temperature.
pdf - 523 kB

T. Vuherer, A. Godina, Z. Burzić, V. Gliha - Fatigue Crack Initiation from Microstructurally Small Vickers Indentations

     The resistivity of a coarse grain steel against fatigue crack initiation in presence of micro-defects is discussed. Samples of material with martensitic microstructure were prepared by adequate thermal treatment. Microstructurally small Vickers indentations were used as artificial micro-defect. The compressive residual stresses are due to the irreversibility of plastic deformation. The moment of indenting enables to prepare samples with and without effects of residual stresses. The stress level for crack initiation depends on the actual indentation size. The location of initiated cracks is affected by the presence and character of residual stresses.
pdf - 1046 kB

T. Merder, A. Bogusławski, M. Warzecha - Modelling of Flow Behaviour in a Six-Strand Continuous Casting Tundish

   Mathematical modeling has been extensively used to study the fluid flow phenomena taking place in continuous casting tundish. The article presents an analysis of the hydrodynamic properties of a real industrial facility – a six-strand tundish of a capacity of 30 Mg liquid steel. As a result of numerical computations carried out, spatial distributions of the velocity vectors, fields of turbulence kinetic energy, temperature of steel flowing in the tundish and characteristics called RTD (Residence Time Distribution) were get. Calculations were carried out by commercial computer program FLUENT. The geometry and nodal point grid were generated in the GAMBIT program. Results of computer simulation were verificated on the industrial tundish.
pdf - 931 kB

G. Stepanov, I. Mamuzić, A. Babutsky - An Increase of Impact Toughness of Low-Carbon Steel Caused by Impulse Electric Current Treatment

    Investigation results indicating the influence of high-density impulse electric current on impact toughness of Charpy specimens manufactured from low carbon steel are presented. It is shown, that impulse electric current treatment causes a considerable growth of impact toughness of the steel, and type of material fracture is changed from brittle mode to ductile mode.
pdf - 285 kB

Z. Wencel, R. Budzik, R. Križanić, C. Kolmasiak - The Synergy of the Surface Layer after Carburizing of Tool Steel as a Measure of Operational Quality

     In the paper the results of the investigation on surface layer of carburized X150CrMoV12-1 tool steel are presented. Abrasive wearing of the surface was determined according the ASTM G77-98 method. The microstructure of the matrix and distribution of carbides were observed in a Scanning Electron Microscope (SEM). A correlation between the investigated parameters (microstructure/carbides distribution) was found.
pdf - 1555 kB
Home
Preliminary Note

Z. Pędzich, K. Gawdzińska, E. Pamuła - Flaws Description in AlSi11 Alloy-Based Composite Fibres Reinforced Casts

     In the paper the application of different methods: profilography, atomic force microscopy, scanning electron microscopy and mercury porosimetry for description of flaws in composites based on AlSi11 (AK11) alloy with fibrous reinforcement is presented.
pdf - 784 kB

I. Mamuzić, F. Trebuňa, M. Buršák, J. Tomčík - Investigation of Reasons and Possibility of Parameters Elimination Influencing Cracking of Leaf Springs on Continuous Casting Machine

     At the first look very simple and for several hundred years used elastic element can be critical part in complex equipment where its failure invokes extraordinary high losses. In the paper is given a treatment for the solution of this problem by experimental methods and resulting proposal for its final solution.
pdf - 882 kB

V. Jovišević, M. Soković, B. Kosec - Introduction of Explosive Cladding Technology for the Manufacturing of Hydraulic Cylinders

     The microhardness, microstructure and bond strength of the interface of a bi-metallic joint on the cross-section of the testing hydraulic cylinder were investigated. Experimental findings of related to both method of cladding obtained with metallographic and mechanical investigations of the interface between the CuSn6 bronze and the TS5 (Č.1213) steel cylinder, are given.
pdf - 647 kB

M. Buršák, I. Mamuzić - Fatigue Properties of Galvanized Higher-Strength Steel Sheets

     The paper analyzes the fatigues properties of galvanized microalloyed steel sheets H220LAD and H380LAD. Under flat bending conditions and the symmetrical cycle, the fatigue limit of the H220LAD sheet is σCo = ą 152 MPa and that of the H380LAD sheet is σCo = ą188 MPa, and the fatigue limit to tensile strength ratio is 0,41 and 0,37, respectively. During fatigue tests with an increasing number of cycles or an increasing stress value, the degradation of the zinc coating increases (relief formation, damage of integrity). As a result, local corrosion, but also continuation of fatigue damage after 107 cycles, and hence corrosion fatigue, can take place during operation.
pdf - 357 kB

A. M. Gałkin, A. Rzšsowska - Przala, A. Górniak - A New Method of Manufacturing Small-Diameter Bars and Tubes from Hardly Deformable Steels in Skew Rolling

     The paper discusses the process of hot rolling on skew rolling mills and compares it with other methods of manufacturing rods (shape milling) and tubes (pilger rolling). The method and results of calculation of the optimal price of a three-roll skew rolling mill taking into account the benefits for the purchaser and the manufacturer are given.
pdf - 448 kB
Top of Page
Review Paper
M. Holtzer, J. Dańko, R. Dańko - Possibilities of Formation of Dioxins and Furans in Metallurgical Processes as well as Methods of their Reduction

       The metallurgical industry, among others, generates various kinds of wastes: gaseous, dusts, wastes and sewage. Special attention of the European Union is directed towards the elimination or significant reduction of the gaseous-dust contamination emissions including the most hazardous compounds, such as dioxins and furans. In the article the sources of dioxins and furans in metallurgical industry are described along with the reduction methods of these pollutants. Particularly the activities recommended as the Best Available Techniques (BAT) in order to reduce the PCDD/PCDF emission from sintering processes, non-ferrous metallurgy and foundry engineering have been presented.
pdf - 516 kB
Home
Professional Paper

J. Črnko, P. Jelić, L. Lazić, M. Kundak - Operation Indicators of the Rotating-Hearth Furnace in Restrictive Manufacturing Conditions

     The heating operation of the rotating-hearth furnace involving semi-finished steel products was analysed, and specific heat consumption was determined as a function of furnace productivity. The aim was to find out how a change in productivity, which is not accompanied by a modification of the thermal regime, can affect the heating quality and surface oxidation of products.
pdf - 328 kB

J. Holisz-Burzyńska, E. Staniewska, R. Budzik - The Physical Flow of Materials and the Associated Costs in the Production Process of a Rolling Mill

     Efficiency of resources use is, in a large extent, determined by the organization of production flow and the way of their control. The optimization of materials flow in the production process requires the identification of physical flows of goods and it cost. In the article the physical flow process of materials stream in the production process in one of Polish rolling mill and also its logistics analysis and cost analysis are presented.
pdf - 401 kB

R. Budzik, A. Pirikow - Sintering of Ore Mixes Containing Iron Concentrates of a Low SiO2 Concentration of Below 1,0 %

     The investigation concerned the production of ore sinter from sinter mixes containing a concentrate of a very small grain size of below 0,1 mm and a low silicon content of below 1,0 % with an addition of 0,69 %, 8,5 % and 16 % of calcium (CaO) and 11,5 %, 16 % and 21 % of coke, respectively. The obtained sinter of a low Si content of below 1,0 % is partially metallised and may be used as an iron ore substitute for the steelmaking process.
pdf - 371 kB
October / December
2 0 0 7
Top of Page
Original Scientific Paper
Preliminary Note
Review
Review Paper
Professional Paper
ARCHIVE 1996 - 2007