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Original Scientific Paper
Preliminary Note
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ARCHIVE 1996 - 2011
50
year issue
Metalurgija - Journal for Theory and Practice in Metellurgy
Metallurgy 50 (4) 216 - 288
PDF - 2453 kB
ISSN 1334-2576    UDC:669+621.7+51/54(05)=163.42=111     METABK: 50 (4) 217 - 288 (2011)
Authors
Original Scientific Paper
T. Lis
Optimisation of metal charge material for electric arc furnace
abstract, article page 219 - 222 PDF - 137 kB
T. Merder, J. Pieprzyca
Numerical modeling of the influence subflux controller of turbulence on steel flow in the tundish
abstract, article page 223 - 226 PDF - 141 kB
B. Mateša, D. Kozak,
A. Stoić, I. Samardžić
The influence of heat treatment by annealing on clad plates residual stresses
abstract, article page 227 - 230 PDF - 227 kB
A. Košnik, J. Tušek,
L. Kosec, T. Muhič
The manufactoring of a two-layered injection mold by welding
abstract, article page 231 - 234 PDF - 225 kB
D. Klobčar, M. Muhič,
J. Možina, J. Tušek
Laser grooving of surface cracks on hot work tool steel
abstract, article page 235 - 238 PDF - 151 kB
J. Przondziono, W. Walke,
A. Szuła, E. Hadasik,
J. Szala, J. Wieczorek
Resistance to corrosion of magnesium alloy AZ31 after plastic working
abstract, article page 239 - 243 PDF - 213 kB
S. Legutko, P. Kluk,
A. Stoić
Research of the surface roughness created during pull broaching process
abstract, article page 245 - 248 PDF - 301 kB
Home
Preliminary Note
I. Bernáthová, M. Buršák
Properties of pure titanium and ultra fine grained titanium
abstract, article page 249 - 252 PDF - 171 kB
Z. Gulišija, A. Patarić,
M. Mihailović
The possibility of increasing production efficiency of al alloys applying electromagnetic field
abstract, article page 253 - 256 PDF - 145 kB
M. Saternus
Modelling research of hydrogen desorption from liquid aluminium and its alloys
abstract, article page 257 - 260 PDF - 161 kB
A. Fornalczyk, M. Saternus
Catalytic converters as a source of platinum
abstract, article page 261 - 264 PDF - 146 kB
J. Łabaj, B. Oleksiak,
G. Siwiec
Study of copper removal from liquid iron
abstract, article page 265 - 268 PDF - 158 kB
I. Samardžić,
M. Dunđer,
A. Pintarić
Possibilities of joining techniques application at railway lines joining and maintenance
abstract, article page 269 - 272 PDF - 278 kB
J. Tepić, V. Todić,
D. Lukić, M. Milošević,
S. Borojević
Development of the computer-aided process planning (CAPP) system for polymer injection molds manufacturing
abstract, article page 273 - 277 PDF - 271 kB
A. W. Bydałek
The analysis of the carbon attendance in copper alloys
abstract, article page 278 - 280 PDF - 123 kB
W. Ptaszyñski, A. Gessner,
P. Frąckowiak, R. Staniek
Straightness measurement of large machine guideways
abstract, article page 281 - 284 PDF - 178 kB
Top of Page
Review Paper
YU. G. Gulyayev, I. Mamuzić,
YE. I. Shyfrin, M. Buršak,
D. YU. Garmashev
Perfection of processes of seamless steel tubes production
abstract, article page 285 - 288 PDF - 98 kB
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Other
Croatian Metallurgical Society
Acknowledgement to Reviewers
article page 172 PDF - 40 kB
Top of Page
Original Scientific Paper

T. Lis - Optimisation of metal charge material for electric arc furnace

     The analysis of the changes in the crude steel production volumes implies gradual increase of production since the mid 20th century. This tendency has been slightly hampered by the economic depression. At the same time, the market requirements enforce improvement of the quality of the products manufactured on simultaneous minimisation of the production costs. One of the tools applied to solve these problems is mathematical optimisation. The author of this paper has presented an example of application of the multi-criteria optimisation method to improvement of efficiency of steel smelting in an electric arc furnace (EAF) through appropriate choice of the charge scrap. A measurable effect of applying such a methodology of choosing the metal charge is the ability to reduce the unit cost of steel smelting.
 PDF - 137 kB

T. Merder, J. Pieprzyca - Numerical modeling of the influence subflux controller of turbulence on steel flow in the tundish

     The paper presents the results of computer simulation of steel flow in the two-nozzle tundish of a T-shaped type. The tundish is symmetrical, relative to the transverse plane. The nominal capacity of the tundish is 7,5 Mg of liquid steel. The Fluent program was used to solve the mathematical model of steel casting process. In numerical simulation for modification of steel flow in the tundish subflux controller of turbulence was used. Three variants of subflux controller of turbulence configurations in the tundish were tested. As effect of mathematical calculations liquid steel velocity, turbulence intensity, turbulent kinetic energy and characteristic of Residence Time Distribution (RTD) have been obtained.
 PDF - 141 kB

B. Mateša, D. Kozak, A. Stoić, I. Samardžić - The influence of heat treatment by annealing on clad plates residual stresses

     The influence of applied clad procedure as well as heat treatment by annealing (650 °C/2h) on level and nature of residual stresses was researched. Three clad procedures are used i.e. hot rolling, submerged arc welding (SAW) with strip electrode and explosion welding. The relaxed deformation measurement on clad plate surfaces was performed by applying centre-hole drilling method using special measuring electrical resistance strain gauges (rosettes). After performed measuring, size and nature of residual stresses were determined using analytical method. Depending of residual stresses on depth of drilled blind-hole is studied.
 PDF - 227 kB

A. Košnik, J. Tušek, L. Kosec, T. Muhič - The manufactoring of a two-layered injection mold by welding

     The article presents the technology of deposit cladding different materials, using the injection molds for thermoplastic as a case study. The aim of the study is to surface weld to the working surface of the mold a different material with corresponding physical properties. Steel (1.1141) and a copper alloy were used as the base, onto which different materials were surface-welded. Tungsten inert gas (TIG) welding was employed to make molds inserts. An analysis of cross-sectioned specimens was made by optical microscopy, and chemical and hardness profiles were measured too. The thermal conductivity of base and cladded layer was also tested. Finally, a thermal fatigue test was employed to investigate the thermal fatigue properties of such surfaces.
 PDF - 225 kB

D. Klobčar, M. Muhič, J. Možina, J. Tušek - Laser grooving of surface cracks on hot work tool steel

     The paper presents the analysis of laser grooving of 1.2343 tool steel hardened to 46 HRC. The effect of laser power and grooving speed on groove shape (i.e. depth and width), the material removal rate and the purity of produced groove as a measure of groove quality was investigated and analyzed using response surface methodology. Optimal parameters of laser grooving were found, which enables pure grooves suitable for laser welding.
 PDF - 151 kB

J. Przondziono, W. Walke, A. Szuła, E. Hadasik, J. Szala, J. Wieczorek - Resistance to corrosion of magnesium alloy AZ31 after plastic working

     The study presents results of electrochemical and chemical corrosion resistance tests of magnesium alloy AZ31 after plastic working. Electrochemical measurements were carried out in 1,35 % solution of NaCl. On the ground of registered polarisation curves, typical features characterising resistance to electrochemical corrosion, were determined. Resistance to chemical corrosion was tested by means of immersion in 3,5%solution of NaCl for the period of 1_5 days. By means of scanning electron microscope with field emission FE SEM S-4 200 Hitachi, qualitative and quantitative analysis of chemical composition in microareas was made. Results of surface layer morphology tests were presented. In order to compare corrosion properties, analogical tests were carried out for the alloy AZ31 obtained by means of pressure die casting.
 PDF - 213 kB

S. Legutko, P. Kluk, A. Stoić - Research of the surface roughness created during pull broaching process

     The paper characterizes the surface layer roughness formed in the process of pull broaching. The factors influencing the roughness of a workpiece subjected to pull broaching were analyzed. As a result of the measurements the basic roughness parameters as well as isometric images of the surface layer for different samples taken from production were obtained. 3D images were also obtained in the investigations of the surface layer of pull broached driving plate.
 PDF - 301 kB

Home
Preliminary Note

I. Bernáthová, M. Buršák - Properties of pure titanium and ultra fine grained titanium

     The properties of ultra fine grained nano Titanium made by ECAP technology and pure cold drawn Titanium are analyzed in this contribution. Mechanical properties, resistance to wear by a ZrO2 ball friction test, corrosion in a Hank solution by the Tafel's method at temperatures 21 °C and 37 °C, and fatigue properties in torsion were evaluated and compared. The fatigue fracture started with crack formation parallel to the specimen axis and it was finalized by cracking in the angle of maximum shear stress. Titanium powder has been observed on the sample surfaces which indicated the crack initiation. Nano structure Titanium showed higher resistance to corrosion less wear by friction, and to a limited number of cycles higher fatigue strength.
PDF - 171 kB

Z. Gulišija, A. Patarić, M. Mihailović - The possibility of increasing production efficiency of al alloys applying electromagnetic field

     The relationships between electromagnetic frequency, microstructure and mechanical properties of continuous casting aluminum alloys were studied in this paper. EN AW 2024 and EN AW 2007 aluminum alloys ingots were produced by electromagnetic continuous casting process. The microstructure and mechanical properties of as cast ingots were examined. The results showed that electromagnetic field, especially low frequency electromagnetic field, greatly influenced the microstructure and mechanical properties of as cast ingots. The significant energy savings and product quality can be achieved by the application of a proper frequency.
PDF - 145 kB

M. Saternus - Modelling research of hydrogen desorption from liquid aluminium and its alloys

     The refining process is essential for the removing undesirable hydrogen and harmful impurities from liquid aluminium and its alloys. Physical modelling allows to observe the level of refining gas dispersion in the liquid aluminium. Test stand for physical modelling of the barbotage process of aluminum for the bath reactor (URO-200) and continuous reactor (URC-7000) were built. Measurements of the oxygen removal from water were carried out as analogy of the hydrogen desorption process from liquid aluminium. In the research the distilled water saturated with the compressed oxygen was used. The level of water saturation with oxygen and then oxygen desorption from water was reached by means of the dissolved oxygen meter Elmetron CO-401.
PDF - 161 kB

A. Fornalczyk, M. Saternus - Catalytic converters as a source of platinum

     The increase of Platinum Group Metals demand in automotive industry is connected with growing amount of cars equipped with the catalytic converters. The paper presents the review of available technologies during recycling process. The possibility of removing platinum from the used catalytic converters applying pyrometallurgical and hyrdometallurgical methods were also investigated. Metals such as Cu, Pb, Ca, Mg, Cd were used in the pyrometallurgical research (catalytic converter was melted with Cu, Pb and Ca or Mg and Cd vapours were blown through the whole carrier). In hydrometallurgical research catalytic converters was dissolved in aqua regia. Analysis of Pt contents in the carrier before and after the process was performed by means of atomic absorption spectroscopy. Obtained result were discussed.
PDF - 146 kB

J. Łabaj, B. Oleksiak, G. Siwiec - Study of copper removal from liquid iron

     The technology of steel is projected to increase in the share-based processes for processing recyclable materials. On the one hand it creates the possibility of lowering the cost of producing steel, while the other is causing the pollution, which because of its physicochemical properties are difficult to remove. The group of this type of pollution is classified as copper. The lower reactivity to iron requiring the analysis of thermodynamic parameters of Fe-Cu system to identify how best to allocate them. The study was conducted for the basic kinetic analysis of Fe-Cu alloy containing 0,5 % wt. Cu and 1,5 % wt. Cu in the pressure range from 0,06 to 1 074 Pa and a temperature of 1 923 K The study was conducted in a vacuum induction furnace VIM-20-50 Seco Warwic.
PDF - 158 kB

I. Samardžić, M. Dunđer, A. Pintarić - Possibilities of joining techniques application at railway lines joining and maintenance

     This paper presents most important techniques which is possible to apply at joining of railway lines as well as maintenance procedure. Beside thermit welding as a older joint process for that job (since 1895.) it is mentioned flash welding as a modern joining technique interesting from the point of cost efficiency. In a case of maintance tasks it is necessary to caunt arc welding processes and thermit welding, too. Authors gave some experimental date collected during investigation on railway lines joining techniques application.
PDF - 278 kB

J. Tepić, V. Todić, D. Lukić, M. Milošević, S. Borojević - Development of the computer-aided process planning (CAPP) system for polymer injection molds manufacturing

     Beginning of production and selling of polymer products largely depends on mold manufacturing. The costs of mold manufacturing have significant share in the final price of a product. The best way to improve and rationalize polymer injection molds production process is by doing mold design automation and manufacturing process planning automation. This paper reviews development of a dedicated process planning system for manufacturing of the mold for injection molding, which integrates computer-aided design (CAD), computer-aided process planning (CAPP) and computer-aided manufacturing (CAM) technologies.
PDF - 271 kB

A. W. Bydałek - The analysis of the carbon attendance in copper alloys

     In the work show, that opinions the leaning on it dissolubilities of carbon can be recognized (and only in approximation) only for copper about large purity. They do not concern it her mostly multiple alloys, at which the majority of alloy additions marks with possibility of creating carbides. Equally important the possibility of creating of carbides of accidental dirts is. The analyses DTA of slags be remain showed with part of carbon and carbides. Introduced and investigation own arguments authorize to conclusion that the technological process of fusion of copper alloys does not it be to characterize in relation with separate guilds to different alloys and should to be to hold on valid in steel - makes principles.
PDF - 123 kB

W. Ptaszyñski, A. Gessner, P. Frąckowiak, R. Staniek - Straightness measurement of large machine guideways

     This paper shows the guideway types of large machines and describes problems with their straightness measurement. A short description of straightness measurement methods and the results of investigation in straightness of 10 meter long guideways of a CNC machine by means of the XL-10 Renishaw interferometer are also presented.
PDF - 178 kB

Top of Page
Review Paper

YU. G. Gulyayev, I. Mamuzić, YE. I. Shyfrin, M. Buršak, D. YU. Garmashev - Perfection of processes of seamless steel tubes production

     The article first give a review more of hundret years long history of seamless steel tube production, especially during the last 15-20 years of the 20th century. Prolongation, article give technological indices for 4 mills (automatical, continuous mill, pilger, Assel), and perfectation of processes seamless steel tubes production at the begining of 21st century.
PDF - 98 kB

July / September
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Top of Page
Original Scientific Paper
Preliminary Note
Review
Review Paper
Professional Paper
ARCHIVE 1996 - 2011