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Original Scientific Paper
Preliminary Note
Review
Review Paper
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ARCHIVE 1996 - 2010
49
year issue
Metalurgija - Journal for Theory and Practice in Metellurgy
Metallurgy 49 (4) 289 - 360
PDF - 3756 kB
ISSN 1334-2576    UDC:669+621.7+51/54(05)=163.42=111     METABK: 49 (4) 289 - 360 (2010)
Authors
Original Scientific Paper
S. Kut
A simple method to determine ductile fracture strain in a tensile test of plane specimen's
abstract, article page 295 - 299 PDF - 200 kB
S. Kastelic, J. Medved,
P. Mrvar
Prediction of numerical distortion after welding with various welding sequences and clampings
abstract, article page 301 - 305 PDF - 260 kB
J. Matusiak, A. Wycioelik
The influence of technological conditions on the emission of welding fume due to welding of stainless steels
abstract, article page 307 - 311 PDF - 154 kB
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Preliminary Note
O. Híreš, I. Barény
Mechanical properties of forgings depending on the changes in shape and chemical composition of inclusions
abstract, article page 313 - 316 PDF - 261 kB
M. Buršák, J. Michel'
Influence of the strain rate on the mechanical and technological properties of steel sheets
abstract, article page 317 - 320 PDF - 305 kB
M. Šiško Kuliš,
Z. Mrduljša, B. Klarin
Assessing the yield point of concrete steels based upon known chemical composition
abstract, article page 321 - 324 PDF - 119 kB
I. Samardžić,
D. Bajić, Š. Klarić
Influence of the activating flux on weld joint properties at arc stud welding process
abstract, article page 325 - 329 PDF - 266 kB
S. Cvetkovski, V. Grabulov,
Z. Odanovic, D. Slavkov
Optimization of welding parameters for gas transportation steel pipes
abstract, article page 331 - 334 PDF - 208 kB
A. Yasar
Effects of alcohol-gasoline blends on exhaust and noise emissions in small scaled generators
abstract, article page 335 - 338 PDF - 284 kB
M. Sekulić, Z. Jurković,
M. Hadžistević,
M. Gostimirović
The influence of mechanical properties of workpiece material on the main cutting force in face milling
abstract, article page 339 - 342 PDF - 299 kB
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Review Paper
S. Dobatkin,,
J. Zrnik, I. Mamuzić
Development of SPD continuous processes for strip and rod production
abstract, article page 343 - 347 PDF - 352 kB
D. Malindžák, M. Straka,
P. Helo, J. Takala
The methodology for the logistics system simulation model design
abstract, article page 348 - 352 PDF - 280 kB
R. Wieszała, B. Gajdzik
The Effectiveness of Environmental Management in a Metallurgical Company's Sustainable Development
abstract, article page 353 - 356 PDF - 101 kB
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Professional Paper
G. Kosec, G. Kovačič,
J. Hodolič, B. Kosec
Cracking of an Aircraft Wheel Rim Made From Al-Alloy 2014-T6
abstract, article page 357 - 360 PDF - 299 kB
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Other
Editorial Board of the Journal
Metalurgija
Minutes
article page 291 - 292 PDF - 134 kB
Editorial Board of the Journal
Metalurgija
Rule Book of the Journal Metalurgija
article page 293 - 294 PDF - 59 kB
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Annual Election Annual Assambly of Croatian Metallurgical Society
article page 330 PDF - 115 kB
Top of Page
Original Scientific Paper

S. Kut - A simple method to determine ductile fracture strain in a tensile test of plane specimen's

     The ultimate ductile fracture strain determination method for the specimen of circular cross-section has been presented by FEM method. The state of stress in individual locations of tensile tested specimen in successive process phases has been determined unequivocally with the stress triaxiality k. It has been demonstrated that the plane specimen's fracture strain value in the fracture location varies and depends on the state of stress, which is present in the final specimen's tension phase. The ductile fracture strain values in various fracture locations for steel, copper and aluminum specimen have been experimentally determined and compared. The simple and practical method to determine this strain has been proposed.
 PDF - 200 kB

S. Kastelic, J. Medved, P. Mrvar - Prediction of numerical distortion after welding with various welding sequences and clampings

     Welding simulation of a test cover for hydropower plant was made due to very large dimensions of the cover. The main aim was to predict distortion after welding in order to avoid machining the cover. Welding process was simulated with the Sysweld program to keep distortion in desired limits. Various welding sequences and clamping conditions were calculated to reduce the distortion. Calculation of microstructure constituents in virtual complex geometry of joints was also analyzed.
 PDF - 260 kB

J. Matusiak, A. Wycioelik - The influence of technological conditions on the emission of welding fume due to welding of stainless steels

     Welding of stainless steel is very popular, which consequently is the reason for growing concern for the working environment at welding stations. Chromium is the basic alloying element of all groups of stainless steels. Majority of those steel grades contains nickel. Compositions of the elements occurring in welding fume have a probable or confirmed carcinogenic effect. The article shows the results of research of the relations between selected groups of stainless steels as well as technology parameters of arc welding processes and the welding fume emission, total chromium, chromium (VI) and nickiel contents in the fume.
 PDF - 154 kB

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Preliminary Note

O. Híreš, I. Barény - Mechanical properties of forgings depending on the changes in shape and chemical composition of inclusions

     The article deals with mechanical properties of forgings used for special technology in cannon barrels production. The forgings are treated by elctroslag remelting technology (ESR) to enhance its plastic properties and yield point. Described experiments are focused on mechanical properties and metallurgical quality (microstructure) of steels from which are the forgings made. The article includes microstructure photographs and description of inclusions located in examined steels. Experimental results compare forgings treated by ESR and next ones without ESR.
PDF - 261 kB

M. Buršák, J. Michel' - Influence of the strain rate on the mechanical and technological properties of steel sheets

     The paper analyses the influence of strain rate on the behaviour of un-alloyed steels with Re (yield strength) in the range of 210 … 550 MPa in the deformation process. It analyses the results of the influence of strain rate ranging from 10-3 to 2,5·102s-1 on the yield strength, the ultimate tensile strength (Rm), the elongation (A) and the reduction of area (Z). Achieved results of strain rate in relationship on values of Erichsen number IE are also given. By increasing of strain rate ranging from 10-3 to 2,5·102s-1 the ratio Re/Rm is increased, whereas it was observed more intensively for steels with the lower value of Re. By increasing of strain rate up to 1 s-1 are IE values of tested steels increased, whereas the ratio Re/Rm was equal 0,82. After exceeding of this strain rate was the ratio Re/Rm increased and IE value is remarkable decreased.
PDF - 305 kB

M. Šiško Kuliš, Z. Mrduljša, B. Klarin - Assessing the yield point of concrete steels based upon known chemical composition

     This research is based on both, theoretical and experimental work and aims to assessment the yield point of concrete steels, based on the known alloy chemical composition. The experimental portion of the work was performed at the Split steelmaking factory, which produces concrete steels from the waste iron. The theoretical portion of this study involves mathematical modelling carried out using the software package MATLAB. The work presented here provides both a scientific and practical contribution to the field. By using mathematical modelling, the accuracy of the estimation of the yield point is improved by 8,5%. Using this correlation enables the reduction of the concrete steel production costs because it is possible to reduce the use of expensive tests for the characterization of strength and mechanical properties.
PDF - 119 kB

I. Samardžić, D. Bajić, Š. Klarić - Influence of the activating flux on weld joint properties at arc stud welding process

     In this paper, the influence of the activating flux on the weld joint properties at the drawn arc stud welding process with ceramic ferrule is analysed. In the experimental part of the paper, the arc stud welding process is applied with the application of the activating flux for ATIG process. In order to evaluate the influence of the activating flux on the welding process parameters variations, the main welding parameters were monitored by an on-line monitoring system. Besides monitoring of welding current and voltage, the influence of the activating flux on the weld joint appearance is investigated. The macrosections of the weld joints welded with the same parameters, but with and without the presence of activating flux are shown.
PDF - 266 kB

S. Cvetkovski, V. Grabulov, Z. Odanovic, D. Slavkov - Optimization of welding parameters for gas transportation steel pipes

     The aim of this paper is to define optimization of welding conditions for Submerged Arc Welding (SAW) of steel pipes for gas transportation. Fine grain steel X-52 with thickness of 8 mm were used as a base material. Welding was performed from inner and outer side. Two wires, inclined under different angles, were feed separately. Eleven samples divided in three series were experimentally welded. Performed investigations indicated that the best properties showed weldments from series III, welded with the highest heat input. On the contrary of our expectations, welds from series II, using self made equipment, showed pretty bead properties and improper geometry. So, improving of this this equipment and obtaining welds with better properties is the target in future investigations.
PDF - 208 kB

A. Yasar - Effects of alcohol-gasoline blends on exhaust and noise emissions in small scaled generators

     In this study, the effect of methanol or butanol addition to gasoline on exhaust emissions and noise level has been experimentally investigated. Results showed that the concentrations of CO and NOx emissions were decreased depending on the higher alcohol contents and the carbon monoxide concentration of gasoline was higher than that of methanol or butanol-gasoline blends for all engine loads. It was determined that content of the HC was decreased at higher engine load but noise level was increased.
PDF - 284 kB

M. Sekulić, Z. Jurković, M. Hadžistević, M. Gostimirović - The influence of mechanical properties of workpiece material on the main cutting force in face milling

     The paper presents the research into cutting forces in face milling of three different materials: steel Č 4732 (EN42CrMo4), nodular cast iron NL500 (EN-GJS-500-7) and silumine AlSi10Mg (EN AC-AlSi10Mg). Obtained results show that hardness and tensile strength values of workpiece material have a significant influence on the main cutting force, and thereby on the cutting energy in machining.
PDF - 299 kB

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Review Paper

S. Dobatkin, J. Zrnik, I. Mamuzić - Development of SPD continuous processes for strip and rod production

     Grain refinement upon the severe plastic deformation (SPD) at low temperatures (below the recrystallization temperature) and an unusual improvement the properties of such materials are shown reliably. However, the industrial application is limited due to the absence of effective continuous SPD processes. The potential of development of continuous SPD processes based on the equal channel angular pressing (ECAP) process from one side and continuous extrusion or drawing processes from another side is considered. Existing various continuous SPD processes for strip, rod and wire production are analyzed.
PDF - 352 kB

D. Malindžák, M. Straka, P. Helo, J. Takala - The methodology for the logistics system simulation model design

     The present paper describes the methodology of the simulation model design applied in the analysis and parameter optimization of the large scale logistics system (LS) in metallurgy. The first part of the papers describes the method and steps of the simulation model design. The second part describes the analysis of the really complicated logistics system. Differences in large scale simulation model design are mainly in the obtaining of the data for individual elements model. Each element inside of LS has very complicated structure of the operations (blast furnaces, raw material stores, transport between mine and metallurgy). For the data obtaining have to perform detail analysis and research this individual elements.
PDF - 280 kB

R. Wieszała, B. Gajdzik - The Effectiveness of Environmental Management in a Metallurgical Company's Sustainable Development

     In the article metallurgy enterprises are being characterised, taking into account, in particular, the environmental management systems as well as the effects of their introduction, on the example of Ferrum SA. In the first part of the article the environmental management system and the applied production technologies in metallurgy enterprises are characterised. In the second part the effects of environmental management systems introduction are presented, based on the published environment reports of the enterprise in the years 1990-2007. In the last part the attention was turned to the future aspects connected with the development of environmental management systems. The issue was summarised in the end.
PDF - 101 kB

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Professional Paper

G. Kosec, G. Kovačič, J. Hodolič, B. Kosec - Cracking of an Aircraft Wheel Rim Made From Al-Alloy 2014-T6

     Generally failures of different aircraft components and parts are revealed and examined by the use of non-destructive examination methods. In further detailed explanation and interpretation of failures optical and scanning electron microscopy are used. This paper deals with a problem of a crack on aircraft wheel rim made from aluminium alloy 2014-T6.The crack was observed during regular control by the maintenance unit for non-destructive examination of the Slovenian air carrier Adria Airways. The crack on the rim of an aircraft wheel investigated was a typical fatigue crack. At same time a numerous pits were found which served as stress concentrations on the rim surface.
PDF - 299 kB

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Original Scientific Paper
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Review Paper
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ARCHIVE 1996 - 2010