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Year 2010 No 1

P. Gengeľ, A. Pribulová, P. Futáš
POSSIBILITIES OF FOUNDRY DUST UTILIZATION IN FOUNDRY PROCESS
Keywords: casting|recycling|granular materials|
No 1 (2010), p. 20-25
  mag03.pdf (889 kB)
mag03_eng.txt (1 kB)  

D. Rodziňák, R.V. Zahradníček, P. Hvizdoš, D. Jakubeczyová
EFFECT OF NITRIDATION ON CONTACT FATIGUE AND WEAR DAMAGE OF ASTALOY CrL AND CrM STEELS
Keywords: Cr- sintered steels|Contact fatigue|Wear|Surface modification|
No 1 (2010), p. 12-19
  mag02.pdf (311 kB)
mag02_eng.txt (2 kB)  

J. Bidulská, R. Kočiško, R. Bidulský, M. Actis Grande, T. Donič, M. Martikán
EFFECT OF SEVERE PLASTIC DEFORMATION ON THE POROSITY CHARACTERISTICS OF Al-Zn-Mg-Cu PM ALLOY
Keywords: aluminium alloy|SPD|ECAP-BP|FEM|porosity|
No 1 (2010), p. 4-11
  mag01.pdf (434 kB)
mag01_eng.txt (2 kB)  

I. Kiss, T. Heput, V. G. Cioată
SOME INTERPRETATIVE RESEARCH IN THE AREA OF CAST IRON ROLLS QUALITY ASSURANCE
Keywords: iron|rolls|hardness|modeling|level curves|correlations|
No 1 (2010), p. 26-34
  mag04.pdf (878 kB)
mag04_eng.txt (1 kB)  

I. Kiss
ABOUT THE DURABILITY IN EXPLOITATION OF THE CAST IRON HOT ROLLING MILL ROLLS IN FEW EXPERIMENTAL RESULTS
Keywords: rolling rolls|thermal cycles|thermal regimes|durability|experiments|
No 1 (2010), p. 35-41
  mag05.pdf (145 kB)
mag05_eng.txt (2 kB)  

I. Kiss, T. Heput, V. Alexa
SOME APPROACHES REGARDING THE QUALITY ASSURANCE IN THE CAST-IRON ROLLS MANUFACTURING
Keywords: cast-iron|rolls|alloying|hardness|casting|technology|BSI Quality Assurance
No 1 (2010), p. 42-49
  mag06.pdf (162 kB)
mag06_eng.txt (1 kB)  

J. Petrík, P. Palfy1, M. Havlík, L. Girmanová
THE OBSERVATIONS OF INDIRECT CALIBRATION OF MICROHARDNESS TESTERS
Abstract
The objective of the article is to analyze results of indirect calibration of three microhardness testers. The calibration was carried out by four appraisers using three reference blocks. The results were evaluated according to standard STN EN ISO 6507-2:2005 and by uncertainty analysis, unpaired t-test, the Analysis of Variance (ANOVA) and Z-score. All calibrated testers do not satisfy the condition of resolution. Only 5 calibrations (13.9 %) meet the conditions of standard. According to Analysis of Variability (ANOVA), the influence of appraisers on the microhardness is significant, especially for “soft” reference block and for tester No. 1. Maximum number of statistically significant differences between mean microhardness, measured by one appraiser and specified microhardness of correspondent standard was obtained at calibration of tester No. 2 by t-test. Unsatisfactory or conditionally satisfactory values of z-score were observed at calibration of tester No. 3, but the values of testers No. 1 and 2 are satisfactory. The values of z-score measured by appraisers B and C at calibration of testers No. 1 and No. 2 exceeded the average. Using newer equipment with higher magnification (and with higher resolution) of the optical system and skilled appraisers for calibration is the way for improvement of the results of calibration.

Keywords: Microscopy and Microanalysis Techniques|hardness test|microindentation|
No 1 (2010), p. 50-57
  mag07.pdf (85 kB)
mag07_eng.txt (1 kB)  

M. Dziaková, I. Vasková, D. Fecko
INFLUENCE OF OPERATING FACTORS ON PROPERTIES OF FURAN MIXTURES
Keywords: casting|bonding|granular materials|
No 1 (2010), p. 58-63
  mag08.pdf (112 kB)
mag08_eng.txt (1 kB)