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Year 2006 No 3

Fujda M., Longauerová M.
MORPHOLOGY OF FINE SURFACE CRACKS ON LOW CARBON STEEL CC SLAB ENRICHED BY COPPER
Keywords: fine branched cracks|CC slab|surface zone|Cu-base phase|penetration|primary grain boundaries|
No 3 (2006), p. 243-249
  mag01.pdf (791 kB)
mag01_eng.txt (2 kB)  

Sojka J., Váňová P., Jonšta P., Rytířová L., Krol S., Jerome M.
MICROSTRUCTURAL ASPECTS OF SULPHIDE STRESS CRACKING OF DUPLEX STAINLESS STEELS
Keywords: duplex stainless steels|sulphide stress cracking|hydrogen induced cracking|microstructure|
No 3 (2006), p. 250-256
  mag02.pdf (731 kB)
mag02_eng.txt (2 kB)  

Besterci M., Sülleiová K., Kvačkaj T.
VERIFICATION OF HALL-PETCH EQUATION OF NANOCRYSTALLINE COPPER
Abstract
Recently, large attention is devoted to the research and development of nanostructured materials. These materials with unique microstructure and fine grain size d < 100 nanometres have good physical and mechanical properties. The outstanding mechanical properties (superstrength, superhardeness, enhanced tribological characteristics, enhanced tensile ductility and superplasticity) are of special importance. Several different methods for preparing of nanomaterials are elaborated, some of them based on powder metallurgy technique. Residual porosity, pollution of the material system and grain coarsening are the problems that are unresolved satisfactorily up to now. These negatives can be eliminated by severe plastic deformations (SPD) using the method of the equal channel angular pressing (ECAP) where the experimental material is pressed in special matrix through a special die consisting of two equal channels at the angle of 90°. The formation of high angle nanograins with the specific substructure of lattice and grain boundary dislocations is studied intensively and analyzed on models and real material systems, too.
Hall-Petch dependence as well as evolution of Cu microstructure after severe plastic deformation (SPD) realised by the method of the equal channel angular pressing (ECAP) are analysed the present paper. On the basis of experimental results and analyses the different mechanisms of plastic deformation generation for coarse grain and nanograin structures were identified. A final grain size decreased from the initial 50 ?m to 100-300 nm after ten ECAP passes. Mechanical properties before ECAP were Rp0,2=270MPa, Rm=275MPa, Z=65% and after ten passes Rp0,2=464MPa, Rm=475MPa, Z=60%. Increase and deflection of conventional yield stress point were explained by dislocation theory.

Keywords: ECAP|Cu|nanoštruktúrne materiály|konvenčná medza sklzu|mikroštruktúrne parametre|
No 3 (2006), p. 257-263
  mag03.pdf (439 kB)
mag03_eng.txt (2 kB)  

Visuttipitukul P., Paa-rai C., Kuwahara H.
CHARACTERIZATION OF PLASMA NITRIDED AISI H13 TOOL STEEL
Keywords: Plasma nitriding|H13 steel|Chromium nitride|Precipitate|
No 3 (2006), p. 264-274
  mag04.pdf (1 MB)
mag04_eng.txt (2 kB)  

Pavolová H., Bakalár T., Kyseľová K.
EFFICIENCY OF COPPER REMOVAL FROM WASTEWATER USING SELECTED ADSORBENTS
Keywords: adsorption|heavy metal|chitosan|Lewatit|zeolite|
No 3 (2006), p. 275-281
  mag05.pdf (347 kB)
mag05_eng.txt (2 kB)  

Žilková J., Timko J.
NEURAL MODELLING OF A TINNING LINE’S TECHNOLOGICAL PART
Keywords: estimation|modelling|tinning line|DC motor|artificial neural network|cascade network|feedforward network|
No 3 (2006), p. 282-290
  mag06.pdf (278 kB)
mag06_eng.txt (2 kB)  

Šabíková M., Kucková A.J., Fröhlichová M., Petíkova I.
STUDIES ON DISTRIBUTION OF MACERALS AND THE COAL TYPES WITHIN THE COLLECTIVE GROUND COAL CHARGE
Keywords: coal charge|types coal|maceral groups|size of coal|grinding of coal|
No 3 (2006), p. 291-298
  mag07.pdf (268 kB)
mag07_eng.txt (1 kB)  

Fabián M., Baláž P., Godočíková E.
SELECTED IDENTIFICATION METHODS IN ANALYSIS OF NANOCRYSTALLINE MATERIALS
Keywords: STM|AFM|TEM|HRTEM|nanoscience|nanoparticles|
No 3 (2006), p. 299-308
  mag08.pdf (1 MB)
mag08_eng.txt (2 kB)  

Bidulský R., Actis-Grande M.
THE CHOICE OF METAL POWDER FOR MIM
Keywords: powder metallurgy|metal injection moulding|metallic powder|
No 3 (2006), p. 309-313
  mag09.pdf (246 kB)
mag09_eng.txt (2 kB)  

Gajdzik B.
COMPONENTS OF CORPORATE IDENTITY OF METALLURGICAL COMPANIES
Keywords: image of metallurgical company|corporate identity system|components of identity|logo|colours|advertising slogans|occasional prints|business car|
No 3 (2006), p. 314-318
  mag10.pdf (197 kB)
mag10_eng.txt (1 kB)  

Sütőová A., Molnár Ľ.
ENVIRONMENTAL PERFROMANCE EVALUATION OF ORGANIZATIONS AS A TOOL OF ENVIRONMENTAL MANAGEMENT SYSTEM
Keywords: environmental performance evaluation|environmental aspects|environmental indicators|
No 3 (2006), p. 319-327
  mag11.pdf (274 kB)
mag11_eng.txt (1 kB)