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Year 2008 No 1

Besterci M., Velgosová O., Ivan J., Kvačkaj T.
THE MECHANICAL PROPERTIES AND FRACTURE MECHANISM OF Al-Al4C3 SYSTEM INVESTIGATED BY “IN-SITU TENSILE TEST IN SEM” METHOD
Abstract
Dispersion strengthened materials belong to the group of composite materials, which are made mainly by the techniques of powder metallurgy. Their structure is formed with a polycrystalline matrix, in which dispersion particles are incorporated, mainly of the oxide, carbide and nitride types. The strengthening effect of dispersoids is both direct, based on the braking of the matrix dislocation movement, and indirect, resulting from a. forming, dispersoids increase the density of dislocations and refine the grain and subgrain structure. The effectiveness of the strengthening effect of dispersoids depends on their type, size, morphology, volume fraction and distribution. Their resistance against dissolution and coalescence is an important factor in their strengthening effect, mainly at high temperatures.
The method of “in-situ tensile testing in SEM” is suitable for investigations of fracture mechanisms because it enables to observe and document deformation processes directly, by which the initiation and development of plastic deformation and fracture can be reliably described.
With increasing tensile load, local cracks are formed by rupture of large particles and decohesion of smaller particles. Further increase of load leads to the crack growth by coalescence of cavities in the direction from the surface to the specimen centre. The cracks can be oriented parallel or perpendicular to the loading direction in depending on the particle volume fraction. The final rupture takes place in variably dense rows, depending on the volume fractions of carbide (Al4C3) and oxide (Al2O3) particles.

Keywords: composite material|“in-situ tensile testing in SEM”|fracture mechanisms|
No 1 (2008), p. 7-16
  mag01.pdf (2 MB)
mag01_eng.txt (2 kB)  

Fáberová M., Jakubéczyová D., Selecká M.
TECHNOLOGICAL AND MICROSTRUCTURAL PROPERTIES OF RAPID-SOLIDIFIED PM HSS STEEL ADDITIONALLY ALLOYED WITH COBALT
Keywords: rapid solidification|high speed steels|cooling rate|particle size|
No 1 (2008), p. 17-23
  mag02.pdf (780 kB)
mag02_eng.txt (1 kB)  

Vadász P., Tomášek K.
INDIRECT METHODS OF STRUCTURAL STUDY OF OXIDES MELTS
Keywords: melt|structure|density|surface tension|fayalite|cluster|
No 1 (2008), p. 24-33
  mag03.pdf (507 kB)
mag03_eng.txt (2 kB)  

Lašček M.
SPECIFIC HEAT CAPACITY OF 1Cr18Ni9 AUSTENITIC CHROMIUMNICKEL STEEL
Keywords: Molar heat capacity|specific heat capacity|heating and cooling curve (rate)|non-stabilised 1Cr18Ni9 austenitic chromium-nickel steel|alfa and beta|
No 1 (2008), p. 34-49
  mag04.pdf (456 kB)
mag04_eng.txt (2 kB)  

Mišičko R.
EMBRITTLEMENT OF CONTINUOUSLY CAST STEEL PRODUCTS AND ITS MICROSTRUCTURAL EFFECTS
Keywords: Embrittlement|cracks|grain boundaries|austenite|ferrite|carburization|decarbonization|
No 1 (2008), p. 50-58
  mag20.pdf (432 kB)
mag20_eng.txt (2 kB)  

Jandová J., Havlák L., Kondás J.
RECYCLING OF LITHIUM-CONTAINING WASTEWATER
Keywords: recycling|lithium carbonate|precipitation|alkaline wastewater|
No 1 (2008), p. 59-65
  mag06.pdf (148 kB)
mag06_eng.txt (2 kB)  

Lašček M.
SPECIFIC HEAT CAPACITY MODEL OF BÖHLER S600 HIGH SPEED STEEL
Keywords: Molar heat capacity|specific heat capacity|heating curve (rate)|the steel|BÖHLER S600 high-speed steel|allotropic changes|
No 1 (2008), p. 66-83
  mag07.pdf (436 kB)
mag07_eng.txt (2 kB)  

Demeter P., Mihok Ľ., Byrtus R., Mlčoch P.
UTILISATION OF GRAVEL MADE FROM BLAST FURNACE SLAG FOR PRODUCTION OF CONCRETES
Keywords: Blast furnace slag|Gravel|Concrete|Road engineering|
No 1 (2008), p. 84-92
  mag08.pdf (2 MB)
mag08_eng.txt (2 kB)  

Václavík V.
EFFECTIVE UTILIZATION OF STEEL-MAKING SLAG IN BUILDING INDUSTRY
Keywords: steel slag|natural aggregate|concrete mixture|cube compression strength|prism compression strength|
No 1 (2008), p. 93-102
  mag09.pdf (608 kB)
mag09_eng.txt (2 kB)  

Velgosová O., Miškufová A., Laubertová M.
THE PREPARATION OF AL-BASED COMPOSITES
Keywords: composite Al-|Al2O3 particles|casting|powder metallurgy|Al dross|
No 1 (2008), p. 103-112
  mag10.pdf (492 kB)
mag10_eng.txt (2 kB)  

Kucková A.J., Sajková M., Fröhlichová M., Baran P., Bálintová J.
THE INFLUENCE OF TYPE COMPOSITION OF COAL CHARGE ON COKE QUALITY
Keywords: Type analysis|coal charge|charge quality|coke quality|
No 1 (2008), p. 113-118
  mag11.pdf (90 kB)
mag11_eng.txt (1 kB)  

Rozpondek M., Siudek M.
RENEWABLE ENERGY SOURCE – BIOMASS PELLETS
Keywords: pellets|testing pellets|combustion|pellet’s ash|
No 1 (2008), p. 119-124
  mag12.pdf (345 kB)
mag12_eng.txt (2 kB)  

Majchrzycka A., Kozak T.
THE USE OF BIOGAS IN THE RURAL AREAS
Keywords: biomass|biogas|cogeneration|power plant|heat balance|
No 1 (2008), p. 125-131
  mag13.pdf (94 kB)
mag13_eng.txt (2 kB)  

Manoljović R., Koneska Z., Stoevska-Gogovska D.
QUANTITATIVE PARAMETERS OF DEFORMATION OF COLD ROLLED METAL MATERIALS
Keywords: quantitative parameters of deformation|thickness reduction elongation|spreading|cold rolling|metal’s materials|
No 1 (2008), p. 132-141
  mag14.pdf (93 kB)
mag14_eng.txt (2 kB)  

Vinklerová Š.
APPLICATION OF UNIQUANT AND QUANTAS STANDARDLESS PROGRAMS IN THE X-RAY SPECTROMETRIC ANALYSES OF MATERIALS FROM THE METALLURGICAL PRODUCTION
Keywords: X-ray spectrometry|standardless technique|chemical composition|metallurgical materials|
No 1 (2008), p. 142-150
  mag15.pdf (112 kB)
mag15_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 cards|
No 1 (2008), p. 151-155
  mag16.pdf (58 kB)
mag16_eng.txt (524 B)  

Gajdzik B.
ENVIRONMENTAL MANAGEMENT AT METALLURGICAL COMPANY - BASIC ELEMENTS OF SYSTEM
Keywords: environmental protection|environmental management|development balanced strategy|ecological investments|ecological effects|
No 1 (2008), p. 156-161
  mag17.pdf (59 kB)
mag17_eng.txt (1 kB)  

Pernis R.
BEGINNING OF METAL FORMING AND UNIVERSITY STUDIES ON SLOVAKIA
Keywords:
No 1 (2008), p. 162-171
  mag18.pdf (406 kB)
mag18_eng.txt (1 kB)  

Brehuv J., Magula R.
KNOWN AND UNKNOWN MINING-PROCESSING ACTIVITIES OF ARISTOCRATIC FAMILY „DE SOÓSO“
Keywords:
No 1 (2008), p. 172-176
  mag19.pdf (831 kB)