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Year 2008 No 2

Zifčák P., Brziak P., Balog M., Bošanský J., Srnka M.
THE INFLUENCE OF CREEP CONDITIONS TO MICROSTRUCTURE EVOLUTION AND SUGESTION OF PRECIPITATION CHANGES ASSESSMENT IN THE T24 STEEL
Keywords: steel T24|precipitation|carbides|
No 2 (2008), p. 195-208
  mag01.pdf (463 kB)
mag01_eng.txt (2 kB)  

Seidlerová J., Valášková M., Šustai O., Lešková J.
PHASE AND MORPHOLOGICAL CHARACTERISTICS OF METAL-BEARING MICROPARTICLES
Keywords: Fine grained metal-bearing wastes|Phase and morphology metallurgical wastes|
No 2 (2008), p. 209-223
  mag02.pdf (2 MB)
mag02_eng.txt (2 kB)  

Michalek K., Morávka J., Gryc K.
MODELLING OF TRANSFER PROCESSES IN GAS LADLE BUBBLING AND THEIR MATHEMATICAL IDENTIFICATION BY L-TRANSFORMATION
Keywords: steel|ladle|gas argon bubbling|stir elements|physical modelling|mathematical identification|
No 2 (2008), p. 224-232
  mag03.pdf (278 kB)
mag03_eng.txt (2 kB)  

Gulová L., Zemko M., Vlado M., Lászlo T.
SIMULATION OF PRODUCTION OF SELECTION DEFECTS IN ROLLING-PROCESS
Keywords: hot-rolling|cold-rolling|scores|overlaps|scratches|
No 2 (2008), p. 233-239
  mag04.pdf (1 MB)
mag04_eng.txt (2 kB)  

Nohavica D., Gladkov P., Jarchovský Z., Zelinka J.
DEFECT STRUCTURE MODIFICATIONS BY POROUS InP AND NON-IZOPERIODICAL HETEROJUNCTIONS GROWTH ON MICROPORES CONTAINING InP AND GaP
Keywords: Micropores in semiconductors|InP micropores|GaP nanopores|heat treatment|dislocations reduction|InAs/InP heterostructure|ZnO/GaP heterostructure|
No 2 (2008), p. 240-246
  mag05.pdf (346 kB)
mag05_eng.txt (2 kB)  

Donič T., Martikán M.
EVALUATION OF RESULTS OF COMPRESSION AND TENSILE ANALYSIS OF COMPACTS ON THE BASE OF 1 µM ALUMINIUM POWDER
Abstract
This article presents the issue of the compaction of 1 µm aluminium powder by the forward extrusion method at different thermodynamic conditions. Experimental systems for two-sided pressing and subsequent forward extrusion process at different reduce ratios are presented in detail. The methods of the planned experiment are conducted under experimental analyses and result in variations of various extrusion temperatures, deformation rates, and reduce ratios. Initial, precompact density factors of the compacts were obtained by a two-sided pressing process. Compression tests are realized at cold one dimensional pressing without special treatment of contacts planes and without use of lubricant. There wasn`t evaluated change of original cylindric shape of experimental specimens. Function relation ? = f(?), where ? = ln h/h0 was calculated from function relations F = f(?h). The highest deformation energies were identificated on compacts produced at tepmeratures of 300 and 450°C. Functionalities ? = f(?h), Hollomon`s exponential functions as well as total deformation energy are presented too. Deformation hardening exponents at tensile test of compacts on basis of 1µm aluminium powder were analyzed. Deformation hardening exponents were unambiguously function of diffusion processes which were very probably initiated at process of compactation. Deformation hardening exponents had value from n=0,63 for compact produced at 300°C to n=0,9 for compact produced at 450°C. Tensile tests were realized at static conditions and are like the compression tests presented in detail. Metallographic and REM analyses allowed the structures of fractured surfaces to be evaluated.

Keywords: Compression test|Tensile test|Forward extrusion|Aluminium powder|Work-hardening exponent|Fracture analysis|Hollomon`s function|
No 2 (2008), p. 247-256
  mag06.pdf (289 kB)
mag06_eng.txt (2 kB)  

Bidulská J., Bidulský R., Kvačkaj, T., Bardi F., Evangelista E.
FORMABILITY EVALUATION OF ALUMINIUM ALLOY BY MEANS OF TORSION TEST AT LOW STRAIN RATE
Keywords: aluminium alloy|torsion test|formability|
No 2 (2008), p. 257-262
  mag07.pdf (179 kB)
mag07_eng.txt (2 kB)  

Blach J., Ševc P., Výrostková A.
INFLUENCE OF HYDROGEN ON STRENGTH AND FAILURE OF DISSIMILAR WELD JOINT OF Cr-Mo,V STEELS FOR ENERGY EQUIPMENTS AT TENSILE STRAIN
Keywords: Cr-Mo,V steels|hydrogen embrittlement|dissimilar weld joint|hydrogen induced cracking|tensile strain|cleavage failure|
No 2 (2008), p. 263-274
  mag08.pdf (397 kB)
mag08_eng.txt (2 kB)  

Sučik G., Hršak D., Fedoročková A, Lazić L.
THE PRELIMINARY CHARACTERIZATION OF SERPENTINITE FROM LJESKOVAC LOCALITY IN CROATIA
Keywords: serpentinite|lizardite|X-ray powder diffraction|differential thermal analysis|dilatometry|
No 2 (2008), p. 275-280
  mag09.pdf (193 kB)
mag09_eng.txt (839 B)  

Mišičko R.
PHYSICAL – METALLURGICAL FUNDAMENTAL CONCEPT OF CRACKING OF CONTINUOUSLY CAST PRODUCTS
Keywords: friction|stress|micro-crack|crack|peritectic transformation|austenite grain|dendrite|under solidus recrystallization growth|
No 2 (2008), p. 281-285
  mag16.pdf (53 kB)
mag16_eng.txt (1 kB)  

Gajdzik B.
THE PROCESS OF STEEL AND METALLURGIC PRODUCT DISTRIBUTION IN POLISH MARKET
Keywords: distribution of steel and metallurgical products|distribution channels|distribution networks|simultaneous marketing (SM)|
No 2 (2008), p. 286-291
  mag11.pdf (178 kB)
mag11_eng.txt (420 B)  

Kiss I.
RESEARCH AND EXPERIMENTS REGARDING THE MANUFACTURING OF METALLIC MATERIALS WITH A BETTER CUTTING CAPACITY
Keywords: researches|experiments|steels|metal constructions|sulphur addition|technology|improvement of the processing easiness|
No 2 (2008), p. 292-297
  mag12.pdf (70 kB)
mag12_eng.txt (1 kB)  

Mitrík V., Suchý T., Horváth L.
USING OF IGCC FOR COMBINED HEAT AND POWER GENERATION (COGENERATION)
Keywords: gasification|combined cycle|power generation|synthetic gas|emissions|
No 2 (2008), p. 298-301
  mag13.pdf (56 kB)
mag13_eng.txt (385 B)  

Forraiová L.
CHEMICAL ANALYSE OF FEMNC SLAGS
Keywords: slag from FeMnC production|bazicity|phase composition|
No 2 (2008), p. 302-306
  mag14.pdf (1 MB)
mag14_eng.txt (1 kB)  

Kiss I.
REJECT FORMS IN THE CAST IRON ROLLS PRODUCTION BETWEEN THE STATISTICAL RESEARCH AND TECHNOLOGICAL MEASURES IN FOUNDRIES
Keywords: cast iron rolls|reject forms|statistical analyses|hardness classes|rolls’ type|
No 2 (2008), p. 307-314
  mag15.pdf (159 kB)
mag15_eng.txt (1 kB)