Z A G R E B
July / September
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Original Scientific Paper
Preliminary Note
Review
Review Paper
Professional Paper
ARCHIVES 1996 - 2007
46
year issue
Metalurgija - Journal for Theory and Practice in Metellurgy
Metallurgy 76 (80) page
pdf - 17277 kB
ISSN 1334-2576    UDC: 669+621.7+51/54(05)=163.42=111     METABK: 46 (3) 148 - 224 (2007)

Authors
Original Scientific Paper
D. Živković, D. Manasijević,
Ž. Kamberović,
M. Cocić, B. Marjanović

Thermodynamic and Structural Investigation of the Ag-In-Sb System
 abstract, article page 151 - 156 pdf - 966 kB

J. Bidulská,
T. Kvačkaj, R. Bidulsky,
M. Cabbibo, E. Evangelista

Effect of Low Strain Rate on Formability of Aluminium Alloy
abstract, article page 157 - 159 pdf - 282 kB

M. Torkar, V. Uršić,
F. Vode, M. Lamut
The Application of Waste Silica Cyclone Powder for the Protective Coating of Steel Billets
abstract, article page 161 - 164 pdf - 509 kB
Home
Preliminary Notes
I. Leššo, P. Flegner,
B. Pandula, P. Horovčák
New Principles of Process Control in Geotechnics by Acoustic Methods
abstarct, article page 165 - 168 pdf - 567 kB
L. Kraus, J. Zrník,
P. Wangyao, S. Nemček
Materials Properties of Modifeied Ni-Based Alloy
abstarct, article page 169 - 172 pdf - 508 kB
J Vojvodič Tuma,
R. Celin
Erection of a Stainless-Steel Tank for Storing a Phosphoric Acid
abstarct, article page 173 - 178 pdf - 776 kB
M. Ikonić, B. Barišić,
D. Blažević
Identification and Quantification of Raw Materials During Designing of Cast Producing Process
abstarct, article page 179 - 184 pdf - 688 kB
I. Juraga, V. Šimunović,
Đ. Španiček
Contribution to the Study of Effects of Surface State of Welded Joints in Stainless Steel Upon Resistance Towards Pitting Corrosion
abstarct, article page 185 - 189 pdf - 908 kB
F. Trebuňa, F. Smičák,
M. Buršák, J. Tomčik
Research of Mechanical Properties of Piping Yards in the Assessment of their Safe Operation
abstarct, article page 191 - 194 pdf - 602 kB
P. Wangyao, J. Zrnik,
I. Mamuzić, S. Polsilapa,
S. Klaijumrang
Restoration and Thermal Stability Investigation of Intermetllic Phase in Exposed Nickel Base Superalloy Udimet 500 Turbine Blades
abstarct, article page 195 - 199 pdf - 765 kB
F. Trebuňa, F. Šimčák,
M. Buršák, J. Bocko,
P. Šarga, M. Pástor,
P. Trebuňa
The Strain Gage Method for Determination of Input Working Life Parameters of Pipes in Compressor Stations
abstarct, article page 201 - 204 pdf - 773 kB
Top of page
Review Paper
N. Devčić,
I. Mamuzić
Trend of Modernization of Pilger Equipment
abstarct, article page 205 - 209 pdf - 267 kB
J. Tušek,
M. Šraj
Oxy-Hydrogen Flame for Cutting of Steels
abstarct, article page 211 - 215 pdf - 567 kB
A. Kulawik,
S. Włudyka,
R. Prusak
Correlation Between the Efficiency of Machinery and Equipment and the Productivity of Workers and its Effect on the Performance of a Metallurgical Undertaking
abstarct, article page 217 - 220 pdf - 190 kB
Z. Skuza,
R. Prusak,
C. Kolmasiak
Restructuring of the Metallurgical Industry in the Aspect of Economics - System Changes and Integration with the European Union
abstarct, article page 221 - 224 pdf - 259 kB
Top of page
Original Scientific Paper

D. Živković, D. Manasijević, Ž. Kamberović, Cocić, B. Marjanović - Thermodynamic and Structural Investigation of the Ag-In-Sb System

      The Ag-In-Sb ternary system presents one of the possible lead-free solder candidates. Therefore, the results of thermodynamic study of the alloys in the Ag-In-Sb alloys, obtained using general solution model, are presented in the paper. Obtained data for partial and integral molar thermodynamic quantities in the temperature interval 1000-1200K are given. The characterization of these alloys have been done using DTA, XRD, SEM and optic microscopy, which enabled the construction of the Ag-In-Sb phase diagram in the concentration range up to 60 wt. % Ag.
pdf - 966 kB

J. Bidulská, T. Kvačkaj, R. Bidulsky, M. Cabbibo, E. Evangelista - Effect of Low Strain Rate on Formability of Aluminium Alloy

   Effect of low strain rate on formability of aluminium alloy 2014 by means of torsion test was performed. The presented experimental results exhibit decrease of the ductility with increase and decrease of έ and T, respectively, and optimal values of έ T are thus obtained. pdf - 282 kB


M. Torkar, V. Uršić, F. Vode, M. Lamut - The Application of Waste Silica Cyclone Powder for the Protective Coating of Steel Billets

     The role of a protective coating is to diminish the steel surface scaling during the reheating for hot rolling. The protective coating consists of several components, and the effect of the coating is based on the formation of the modification of Al2O3, amorphous SiO2 and FeO×Al2O3, which all exhibit low permeability to oxygen at temperature up to 1200 °C. The silica sand powder from the cyclone is a waste product in the separation of silica sand. Tests confirmed that waste cyclone powder could replace the silica flour as one of the ingredients in the protective coating. The results of the efficiency of the protective coating after the advanced application of waste cyclone powder on AISI 1059 and AISI 6150 steels are presented. The application of the coating decreased the oxidation and decarburisation of the steel surface during the reheating for hot rolling. pdf - 509 kB

Home
Preliminary Notes
I. Leššo, P. Flegner, B. Pandula, P. Horovčák - New Principles of Process Control in Geotechnics by Acoustic Methods

     The contribution describes the new solution of the control of rotary drilling process as some elementary process in geotechnics. The article presents the first results of research on the utilization of acoustic methods in identification process by optimal control of rotary drilling. pdf -567 kB


L. Kraus, J. Zrník, P. Wangyao, S. Nemček - Materials Properties of Modifeied Ni-Based Alloy

     The thermomechanical processing of NiMoCr solid solution nickel base superalloy is the way to considerably influence the grain size. As uniform coarse grain size increases the creep strength and crack growth resistance. In the work, the processing to achieve uniform recrystallized grain structure with variation of thermomechanical parameters is investigated. The creep behaviour of the alloy after various hot working conditions is determined. The results of creep tests showed that creep characteristics such as strain rate and lifetime were greatly dependent on the initial hot working conditions and annealing parameters. pdf - 508 kB


J. Vojvodič Tuma, R. Celin - Erection of a Stainless-Steel Tank for Storing a Phosphoric Acid

      A storage tank for 93 % phosphoric acid was built in Luka Koper from 7 mm thick ground hot-rolled plates of 316L stainless steel. The capacity of the storage tank is of the 750 m3, diameter of 11 m and the height of 8,2 m. The shell plates were welded manually using the shielded metal-arc and gas-metal-arc processes. Before the erection, welding procedure tests according to EN 288-3 were carried out. During the construction several non-destructive examination methods were used, such as radiographic testing and visual and liquid penetrant examination. After the entire tank and roof structure were completed, a hydrostatic leak test was carried out. The surfaces of all the welds on the internal surface of the vessel were ground and the roughness was checked on site. The surfaces of the base material and the ground welds were passivated and tested for resistance to corrosion with electrochemical measurements. pdf - 776 kB


M. Ikonić, B. Barišić, D. Blažević - Identification and Quantification of Raw Materials During Designing of Cast Producing Process

      It is investigated the possibility to be accounted the raw material’s quantity for each casting on the basis of design draft and mass of casting. To precisely determine the quantity of raw materials is necessary to technological procedure is preliminary accomplished. This task can be reached if correlations between kind of castings, shape complexity of castings, relations between total and net mass of castings, relations between mass of cores and mass of net casting will be established, with all respect toward applied technology and production methods of cores, the molding box and models.
pdf - 688 KB


I. Juraga, V. Šimunović, Đ. Španiček - Contribution to the Study of Effects of Surface State of Welded Joints in Stainless Steel Upon Resistance Towards Pitting Corrosion

      Successful corrosion resistance of stainless steels is based on their natural ability of passivation, i.e. formation of film of chromium oxides that prevents corrosion in many environments. Any nonuniformity of surface layers may be initial spot for corrosion processes and damages. In this contribution, beside real corrosion damages occurred in practice, results of testing of pitting corrosion resistance of weld beads made applying TIG process on AISI 316L steel grade are presented. SEM and EDX testing, as well as electrochemical corrosion testing confirmed adverse effects of heat tints zones upon corrosion resistance of stainless steels. pdf - 908 kB

F. Trebuňa, F. Smičák, M. Buršák, J. Tomčik - Research of Mechanical Properties of Piping Yards in the Assessment of their Safe Operation

      Working life of piping yards of compressor stations is mainly influenced by material parameters of particular structural members. In the paper are given the results of static and dynamic tests of basic as well as welded joint material of pipe of compressor station for which were determined conditions for safe operation. pdf - 602 kB


P. Wangyao, J. Zrnik, I. Mamuzić, S. Polsilapa, S. Klaijumrang - Restoration and Thermal Stability Investigation of Intermetllic Phase in Exposed Nickel Base Superalloy Udimet 500 Turbine Bladesoj uporabi lopatice turbina

      The Udimet 500 nickel base superalloy blade exposed for 50000 hours in land base gas turbine working conditions faced the structure degradation. Six different heat treatments procedures have been applied (the blades were exposed at 900 °C and 1000 °C for different periods with maximum hold of 2500 hours) to rejuvenate the degraded structure. Metallographic work was performed, generally, aging at both temperatures modify the gamma prime size, morphology and distribution characteristics substantially. The volume fraction of secondary gamma prime decreased with increasing aging time. pdf - 765 kB


F. Trebuňa, F. Šimčák, M. Buršák, J. Bocko, P. Šarga, M. Pástor, P. Trebuňa - The Strain Gage Method for Determination of Input Working Life Parameters of Pipes in Compressor Stations

      For determination of safety operation of compressor stations and assessment of their residual working life is necessary to know the levels of residual stresses, operational loading as well as functionality of real support elements and influence of history of previous loading. The method described in the paper was verified several times during solution of problems concerning safety operation of piping yards. The method was also verified by the numerical methods of mechanics. pdf - 773 kB

Top of page
Review Paper
N. Devčić, I. Mamuzić - Trend of Modernization of Pilger Equipment

     In order to survive and keep the advantage of production of seamless tubes in competition with modern rolling mills, productivity of the pilger process must increase, wheras the processing costs must be reduced; it is particularly important to improve quality of the tubes and their surface appearance. In the paper, an option for modernization of the pilger rolling mill (driving section, rolling stand, shift of the tube blank (the hole), etc.) is provided. pdf - 267 kB


J. Tušek, M. Šraj - Oxy-Hydrogen Flame for Cutting of Steels

      The paper deals with oxy-hydrogen cutting of steel plates. The first part deals with calculation of the combustion efficiency of an oxy-hydrogen flame. A device for supply of a hydrogen-oxygen mixture is described. The main part of the paper is focused on oxy-hydrogen cutting and its advantages. The main conclusions show that the cut surface is flat and very smooth, the heat-affected zone is very narrow, and the cutting speed is relatively high. pdf - 567 kB
A. Kulawik, S. Włudyka, R. Prusak - Correlation Between the Efficiency of Machinery and Equipment and the Productivity of Workers and its Effect on the Performance of a Metallurgical Undertaking

      In this paper the example of procedure of life and objectify work effectiveness analysis in metallurgical enterprise were presented. Besides, on the example of chosen units of metallurgical enterprise, results of analysis - based on methodic proposed in the article - were discussed. pdf - 190 kB


Z. Skuza, R. Prusak, C. Kolmasiak - Restructuring of the Metallurgical Industry in the Aspect of Economics - System Changes and Integration with the European Union

      In this paper, the main elements of adjustment processes for the metallurgical industry in system, social and economic aspects are presented. Also, issues connected with the changes in the national economy in the aspects of integration with the European Union are discussed. The results reported in this paper are based on the analysis of the Polish metallurgical industry in the period from 1991 to 2005. pdf - 259 kB
July / September
2 0 0 7
Top of page
Original Scientific Paper
Preliminary Note
Review
Review paper
Professional Paper
ARCHIVES 1996 - 2007