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Year 2008 No 3

Fujda M., Kvačkaj T., Vojtko M., Milkovič O.
MECHANICAL PROPERTIES AND FRACTURE SURFACE MORPHOLOGY OF EN AW 2024 ALUMINIUM ALLOY PREPARED BY ECAP
Keywords: EN AW 2024 aluminium alloy|equal channel angular pressing (ECAP)|ultra-fine grain microstructure|mechanical properties|fracture morphology|
No 3 (2008), p. 331-341
  mag01.pdf (382 kB)
mag01_eng.txt (2 kB)  

Bidulská J., Kočiško R., Kvačkaj, T., Bidulský R., Actis Grande M.
NUMERICAL SIMULATIONS OF EN AW 2014 ALUMINIUM ALLOY IN ECAP PROCESS
Keywords: aluminium alloy|SPD|ECAP|FEM|DEFORM|
No 3 (2008), p. 342-348
  mag02.pdf (370 kB)
mag02_eng.txt (2 kB)  

Bidulský R., Actis Grande M., Kabátová M., Selecká M.
THE EFFECT OF CARBON COATING AND CARBON ADMIXING ON THE COMPRESSIBILITY OF ASTALOY CrL
Keywords: compaction|compressibility|linear regression|density|porosity|
No 3 (2008), p. 349-355
  mag03.pdf (278 kB)
mag03_eng.txt (1 kB)  

Plešingerová B., Lukáčová H., Horkavcová D., Vojtko M.
CRYSTALLIZATION OF CALCIUM PHOSPHATES ON ALKALI-TREATED Ti–SUBSTRATE
Keywords: Precalcification|SCS an SBF Fluids|Activation of Titanium|
No 3 (2008), p. 356-370
  mag04.pdf (2 MB)
mag04_eng.txt (1 kB)  

Dutkiewicz J., Kováčová A., Maziarz M., Litynska L.
MICROSTRUCTURE ANALYSE AND MICROHARDNESS MEASUREMENTS OF BULK METALLIC GLASSES AND THEIR COMPOSITES
Keywords: amorphous metals|metallic glasses|Ni-based alloys|mechanical alloying|hot vacuum pressing|porosity|microhardness|
No 3 (2008), p. 371-380
  mag05.pdf (466 kB)
mag05_eng.txt (2 kB)  

Lascsáková M.
THE INFLUENCE OF USING THE DIFFERENT NUMERICAL METHODS TO FORECAST THE ALUMINIUM PRICES BY MEANS OF TWO INITIAL VALUES
Keywords: forecasting|numerical modelling|ordinary differential equation|
No 3 (2008), p. 381-389
  mag06.pdf (107 kB)
mag06_eng.txt (3 kB)  

Straka Ľ.
ANALYSIS OF HEATED AFFECTED SAMPLE SURFACE AFTER WEDM PROCESS
Abstract
The aim of this paper is to describe real course of the depth of heat affected zone in sub-surface layers of the samples made by technology of wire electrical discharge machining with brass electrode. It is vital to remark in the beginning that the heat impact is an undesirable phenomenon from the standpoint of operating life of parts produced by this progressive technology. Considerable depth of heat affected zone, its characteristic, and its uneven course along cross-section, noticeably contribute to the decrease of quality and longevity of machine parts, as well as cutting tools. The samples were produced on electroerosion machine AGIECUT from tool steel of 950 MPa strength. Applied cutting tool was wire brass electrode of 0.25 mm diameter. To determine suitable HAZ depth measuring method it was necessary to take into account properties of the given technology where impact and consecutive micro-hardness change occurs instantly after high temperature spot effect of electric discharge channel which arises between wire electrode (cutting tool) and material (workpiece) during intensive cooling in dielectric medium. Considering this aspect, the influence shows different values in longitudinal and lateral cross-sections (as of wire electrode movement relatively to the workpiece). The course of the values is in the same time greatly affected by combination of technological parameters that inevitably must observe electroerosion cutting process itself, as well as electro-chemical properties of the material.

Keywords: Parameters of Technological Process|Heat Affected Zone (HAZ)|Quality of Surface|Wire Electrical Discharge Machining (WEDM)|
No 3 (2008), p. 390-396
  mag07.pdf (357 kB)
mag07_eng.txt (2 kB)  

Petrík J., Mikloš V., Tompoš T, Jakub M.
THE EVALUATION OF THE HARDNESS TESTER CALIBTATION QUALITY
Keywords: Vickers hardness test|calibration|uncertainty|
No 3 (2008), p. 405-413
  mag09.pdf (109 kB)
mag09_eng.txt (555 B)  

Ivanišin P., Hirjak M.
BLAST FURNACE SLAG, PROCESSING AND UTILIZATION
Keywords: blast furnace slag|processing of slag|granulated blast furnace slag|blast furnace gravel and blast furnace pumice|utilization of blast furnace slag|
No 3 (2008), p. 414-418
  mag10.pdf (44 kB)
mag10_eng.txt (2 kB)