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Year 2005 No 1

Blacha L.
THE KINETICS OF ZN EVAPORATION FORM CU-ZN ALLOYS
Keywords: metallurgy|alloys|metal evaporation
No 1 (2005), p. 7-13
  mag01.pdf (166 kB)
mag01_eng.txt (815 B)  

Fouad O. A.
UPGRADING OF A LOW-GRADE TITANIUM SLAG BY SULPHATION ROASTING TECHNIQUE TO PRODUCE SYNTHETIC RUTILE
Keywords: ilmenite|titanium slag|sulphation roasting|synthetic rutile
No 1 (2005), p. 14-24
  mag02.pdf (764 kB)
mag02_eng.txt (1 kB)  

Wangyao P., Korath T., Harnvirojkul T., Krongtong V., Homkajai W.
THE SEM STUDY OF MICROSTRUCTURAL RESTORATION BY RE-HEAT TREATMENTS IN CAST SUPERALLOY TURBINE BLADE
Keywords: Microstructural Refurbishment|Rejuvenation|Re-Heat Treatment|Superalloys|Lifetime Extension|IN-738
No 1 (2005), p. 25-35
  mag03.pdf (2 MB)
mag03_eng.txt (2 kB)  

Ševčík A., Ševčíková J.
HIGH TEMPERATURE PROPERTIES AND SURFACE DEFECTS OF SLABS OF LOW CARBON STEELS IN THE AS - CAST STATE
Keywords: low carbon steels|slabs|high temperature strength|hot ductility|surface defects|grain boundary weakening|fracture|
No 1 (2005), p. 36-44
  mag04.pdf (1 MB)
mag04_eng.txt (1 kB)  

Gawad J., Madej L., Szeliga D., Pietrzyk M.
CELLULAR AUTOMATON TECHNIQUE AS A TOOL FOR A COMPLEX ANALSIS OF THE MICROSTRUCTURE EVOLUTION AND RHEOLOGICAL BEHAVIOUR
Keywords: cellular automata|internal variable model|dynamic recrystallization|
No 1 (2005), p. 45-53
  mag05.pdf (535 kB)
mag05_eng.txt (1 kB)  

Lothongkum G., Ratanamahasakul S., Wangyao P.
EFFECT OF HEAT TREATMENT CONDITIONS ON DYNAMIC PARAMETERS OF SECONDARY CARBIDE PRECIPITATION IN CENTRIFUGALLY CAST IRON-BASE SUPERALLOY
Abstract
The aim of this work is to study and investigate the effect of the heat treatment conditions on the microstructure evolution in the iron base alloy strengthened by carbide precipitation. The Fe - 30.8Ni - 26.6Cr alloy, produced in the form of centrifugally cast tubes, was studied by means of scanning electron microscopy (SEM) after various heat treatment conditions. A complete description of the carbide phase precipitation present in the as cast and aged condition was made as a function of time and temperature. After heat treatment, it was found that the secondary carbide precipitated early near the primary carbides, which are chromium and niobium / titanium carbide networks. The secondary carbide precipitations were also found in the dendrite cores. From the time-temperature-precipitation (TTP) diagram, it showed that the slowest precipitation rate was at 800oC and the fastest precipitation rate was at temperature of 1000oC. The maximum amount of secondary carbide was 0.7 vol. %. The kinetic study after Johnson - Mehl - Avrami equation showed that the secondary carbide precipitated by the two-step reactions. The first step was volume diffusion, which controlled growth of secondary carbide precipitation with the activation energy of 213.2 kJ/mole. In addition, the secondary reaction was grain boundary diffusion controlling the growth of precipitation with the activation energy of 51.7 kJ/mole. The obtained TTP diagram was established for the aging application and welding of this alloy. It can be summarized also that the heat treatment conditions have a great effect on shape, size, dispersion and the location of the secondary carbides in the microstructures and could result in the different mechanical properties.

Keywords: Microstructural characterization|centrifugally cast Iron-base superalloy|Fe - Ni - Cr Alloy|Time - Temperature - Precipitation (TTP) diagram|
No 1 (2005), p. 54-61
  mag06.pdf (835 kB)
mag06_eng.txt (2 kB)  

Podrábský T., Juliš M., Pospíšilová S., Němec K., Hrbáček K., Rek A., Jonšta Z.
CHANGES IN MICROSTRUCTURE OF TURBINE WHEEL MADE OF INCONEL 713 LC
Keywords: cast nickel alloys|turbine wheel blades|grain boundaries|cracks|scanning electron microscopy|microstructure
No 1 (2005), p. 62-67
  mag07.pdf (1 MB)
mag07_eng.txt (839 B)  

Podrábský T., Stránský K., Pospíšilová S., Rek A., Dobrovská J., Juliš M.
HETEROGENEITY ALLOY OF INCONEL 713 LC
Keywords: cast nickel alloy|chemical heterogeneity|mathematical-statistical analysis|
No 1 (2005), p. 68-73
  mag08.pdf (384 kB)
mag08_eng.txt (1 kB)  

Molnár F., Čech J.
POSSIBILITITIES OF ZN-AL ALLOY PREPARATION BY REFINING OF HARD ZINC APPART IRON BY ALUMINIUM
Keywords: refining|hard zinc|intermetallic compound FeAl|FeAl3|directional solidification|hot pressing|
No 1 (2005), p. 74-77
  mag09.pdf (147 kB)
mag09_eng.txt (1 kB)  

Rabatin Ľ., Vadász P., Tomášek K.
REFINING ELECTROLYSIS OF THE SECONDARY SILVER ALLOYS
Keywords: silver|electrolysis|silver refining|
No 1 (2005), p. 78-87
  mag10.pdf (310 kB)
mag10_eng.txt (2 kB)  

Pecha J.
EFFECT OF HEAT TREATMENT ON MICRUSTRUCTURE AND PROPERTIES OF HIGH-CHROME STEEL USED IN POWER ENGINEERING
Keywords: heat resistance|spinels|brittle|ferit|austenit|structure|carbid|difraction|Cr equivalent|toughness|
No 1 (2005), p. 88-103
  mag11.pdf (812 kB)
mag11_eng.txt (3 kB)  

Cehlár M., Mihok J., Kyseľová K., Bohušová V.
IMPORTANCE OF KOSOVO LIGNITE DEPOSITS EVALUATION BY FORM OF INVESTMENT EFFICIENTY IN CREATED MARKET ECONOMY
Keywords: lignite mines|economic analysis|investment efficienty|
No 1 (2005), p. 104-115
  mag12.pdf (968 kB)
mag12_eng.txt (2 kB)  

Mišičko R.
CRACKING THEORIES AND HYPOTHESES OF CONTINUOUSLY CAST PRODUCTS
Keywords: cracking|brittlenes|crack|mechanism|surface skin|
No 1 (2005), p. 116-125
  mag13.pdf (476 kB)
mag13_eng.txt (2 kB)  

Kapustová M.
THE MATHEMATICAL MODEL FOR COMFORT AT WORK DETERMINATION IN ENGINEERING PRODUCTION
Keywords: working load|workplace|summary load|mathematical model|comfort at work|
No 1 (2005), p. 126-133 Vydáva eBooks
  mag14.pdf (272 kB)
mag14_eng.txt (2 kB)