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Year 2007 No 4

Bujnošková K., Drápala J., Štěpánek J.
SEGREGATION BEHAVIOUR OF NIOBIUM AND ITS INFLUENCE ON STRUCTURAL CHARACTERISTICS OF MOLYBDENUM SINGLE CRYSTALS PREPARED BY ELECTRON BEAM FLOATING ZONE
Keywords: tungsten|molybdenum|single crystal|electron beam floating zone melting|plasma metallurgy|
No 4 (2007), p. 481-488
  mag01.pdf (482 kB)
mag01_eng.txt (2 kB)  

Jonšta P., Sojka J., Váňová P.
COMPARISON OF RESISTANCE OF QUENCHED AND TEMPERED STEELS TO SULPHIDE STRESS CRACKING
Keywords: sulphide stress cracking|heat treatment|microstructure|mechanical properties|
No 4 (2007), p. 489-494
  mag02.pdf (710 kB)
mag02_eng.txt (2 kB)  

Kubečka P., Váňová P., Jonšta P. , Filuš F.
THE INFLUENCE OF SURFACE CHARACTERISTICS ON HYDROGEN EMBRITTLEMENT OF CARBON STEELS
Keywords: slow strain rate test|hydrogen embrittlement|fish eyes|carbon steel|
No 4 (2007), p. 495-502
  mag03.pdf (875 kB)
mag03_eng.txt (2 kB)  

Malcharcziková J., Pešička J., Kursa M.
STRUCTURAL AND MICRO-STRUCTURAL ANALYSIS OF DIRECTIONALLY CRYSTALLISED INTER-METALLIC COMPOUND Ni3Al REALISED BY TEM
Keywords: Ni-Al based intermetallic compounds|tensile tests|transmission electron microscopy|dislocation density|
No 4 (2007), p. 503-510
  mag04.pdf (1 MB)
mag04_eng.txt (2 kB)  

Mazancová E., Mazanec K.
CONTRIBUTION TO PHYSICAL METALLURGY OF NEW HIGH STRENGTH Mn MATERIAL
Keywords: mechanical twinning|-martensite|stacking fault energy|necking formation|twinning induced plasticity (TWIP)|
No 4 (2007), p. 511-516
  mag05.pdf (849 kB)
mag05_eng.txt (2 kB)  

Řeháčková L., Kalousek J.,Dobrovský L., Kursa M., Drápala J.
CONTRIBUTION TO MATHEMATICAL MODELLING OF MANGANESE DIFFUSION IN A WELDED JOINT OF TWO IRON-BASED MATERIALS
Keywords: welded joint|diffusion|manganese re-distribution|
No 4 (2007), p. 517-523
  mag06.pdf (274 kB)
mag06_eng.txt (2 kB)  

Szurman I., Kursa M., Dlouhý A.
MICROSTRUCTURE OF Ni40-Ti50-Cu10 SHAPE MEMORY ALLOY STUDIED BY TEM
Keywords: Ni-Ti alloys|Transmission electron microscopy|vacuum induction melting|
No 4 (2007), p. 524-530
  mag07.pdf (672 kB)
mag07_eng.txt (1 kB)  

Čížek L., Hanus A., Sozańska M., Tański T., Pawlica L.
STRUCTURE CHARACTERISTICS OF MAGNESIUM ALLOYS WITH ADMIXTURE OF ALUMINUM, SILICON AND ZIRCONIUM
Keywords: Magnesium alloys|Metallographic analysis|Structure|
No 4 (2007), p. 531-538
  mag08.pdf (2 MB)
mag08_eng.txt (2 kB)  

Dobrovská J., Dočekalová S., Smetana B.
STUDY OF COOLING RATE EFFECT ON TRANSFORMATION TEMPERATURES IN THE COURSE OF IN 738LC SOLIDIFICATION
Keywords: transformation temperatures|DTA-method|X-ray spectroscopy|IN 738LC|
No 4 (2007), p. 539-545
  mag09.pdf (1 MB)
mag09_eng.txt (2 kB)  

Jonšta Z., Jonšta P., Vodárek V., Mazanec K.
PHYSICAL-METALLURGICAL CHARACTERISTICS OF NICKEL SUPER-ALLOYS OF INCONEL TYPE
Keywords: nickel super–alloys|as–cast condition|structural – phase analysis|
No 4 (2007), p. 546-553
  mag10.pdf (2 MB)
mag10_eng.txt (2 kB)  

Sojka J., Filuš F., Rytířová L., Jerome M.
DIFFUSION CHARACTERISTICS OF HYDROGEN IN MICRO ALLOY STEELS
Keywords: Micro alloy steels|hydrogen diffusion|electrochemical permeation method|microstructure|banded structure|
No 4 (2007), p. 554-560
  mag11.pdf (1 MB)
mag11_eng.txt (2 kB)  

Greger M., Kocich R., Kuřetová B., Vlček M.
ULTRAFINE GRAINED COPPER BY EQUAL CHANNEL ANGULAR EXTRUSION (ECAE) PROCESSING
Keywords: equal channel angular pressing|evolution structure Cu|
No 4 (2007), p. 561-569
  mag12.pdf (843 kB)
mag12_eng.txt (2 kB)  

Kocich R., Kursa M.,Greger M., Szurman I.
DEFORMATION BEHAVIOUR OF Ni-Ti SHAPE MEMORY ALLOYS AT ECAP PROCESS
Keywords: ECAP technology|Ni-Ti shape memory alloys|mechanical properties|
No 4 (2007), p. 570-576
  mag13.pdf (574 kB)
mag13_eng.txt (1 kB)  

Rusz S., Schindler I., Suchánek P., Turoňová P., Kubečka P., Heger M.
UTILIZATION OF THE HOT WEDGE TEST IN RESEARCH OF HOT FORMABILITY OF FREE-CUTTING STAINLESS STEELS
Keywords: wedge rolling test|free-cutting stainless steel|hot formability|
No 4 (2007), p. 577-582
  mag14.pdf (379 kB)
mag14_eng.txt (2 kB)  

Fabík R., Kurek V., Kocich R., Macháčková A.
LABORATORY SIMULATION OF HEAT TREATMENT OF RAILS
Keywords: cooling curves|thermocouples|rails|TT diagram|hardness|
No 4 (2007), p. 583-588
  mag15.pdf (900 kB)
mag15_eng.txt (2 kB)  

Fabík R., Kurek V., Bazgierová E.
DETERMINATION OF TECHNOLOGICAL PARAMETERS FOR COOLING OF RAILS BY MATHEMATICAL MODELLING
Keywords: cooling curves|inverse analysis|FEM|heat transfer coefficient|rails cooling|hardness|
No 4 (2007), p. 589-595
  mag16.pdf (419 kB)
mag16_eng.txt (2 kB)  

Janošec M., Palát J., Schindler I., Legerski M., Růžička M., Místecký E.
MICROSTRUCTURAL CHANGES AND EVOLUTION OF MECHANICAL PROPERTIES OF COLD ROLLED AND ANNEALED HSLA STEEL STRIPS
Keywords: HSLA steel|cold rolling|annealing|mechanical testing|microstructure|
No 4 (2007), p. 596-601
  mag17.pdf (369 kB)
mag17_eng.txt (2 kB)  

Schindler I., Bílovský P., Rusz S., Plura J., Hadasik E., Jurko V.
INFLUENCE OF HEATING REGIME AND PHASE TRANSFORMATIONS ON DEFORMATION RESISTANCE OF IF STEEL
Keywords: IF steel|deformation resistance|phase transformation|ferritic rolling|
No 4 (2007), p. 602-609
  mag18.pdf (658 kB)
mag18_eng.txt (2 kB)  

Kubina T.,Bořuta J., Schindler I.
NEW POSSIBILITIES OF EVALUATION OF THE DEGREE OF SOFTENING FROM TORSION PLASTOMETRIC TEST
Abstract
The article analyses problems of defining the degree of softening from plastometric tests. There are described original evaluation programmes which have been developed by a composite author on the bases of deep knowledge of problems of the torsion plastometric tests. In the article, there are mainly suggested the basic principles of work with the pyX programme for evaluation of the degree of softening. Torsion intermittent tests have been carried out on a sample set of low-carbon steel on a torsion plastometer SETARAM-VÍTKOVICE. After evaluating of dependencies of the flow stress on deformation intensity with help of the SiPODeX programme, the definition of the degree of softening X followed by the programme pyX. This works on the principle of definition of residual deformation ????between individual partial reductions. The comparison of the individual tests suggests that factors influencing the degree of softening are e.g. temperature, whose increase means intensifying of softening, the length of the time lag when deformation interrupted, and as there was noticed on all samples after second deformations a higher degree of softening, it is clear that the intensity of softening is influenced by the power of the preceding deformation. When observing temperature of samples with 1 second time lag, it was found out that the degree of softening sharply rose at temperatures over 800°C, which proves previous claim about dependency of recovery on temperature. The most intensive recovery of these samples took place at the temperatures 860-1005°C. Samples with 6 sec. time dwell recovered at over 770°C because the material had more time for metadynamic recrystallization. From the evaluation of results in this work, we can state that by testing on a developed torsion plastometer hand in hand with programmes SiPODeX and pyX, it is possible to study carefully softening processes during deformations and pauses.

Keywords: softening|recrystallization fraction|low-carbon steel|torsion test|
No 4 (2007), p. 610-617
  mag19.pdf (810 kB)
mag19_eng.txt (2 kB)  

Suchánek P., Schindler I., Kulveitová H., Kratochvíl P., Hanus P.
MODELS OF MEAN FLOW STRESS AND STRUCTURE EVOLUTION OF IRON ALUMINIDES IN HOT FORMING
Keywords: Structure of iron aluminides|Fe3Al|hot rolling|mean flow stress|sample with graded in size|
No 4 (2007), p. 618-624
  mag20.pdf (403 kB)
mag20_eng.txt (2 kB)  

Kozelský P., Schindler I., Cagala M., Rusz S., Heger M., Křupala A.
HOT FORMABILITY OF LEDEBURITIC TOOL STEEL X155CrVMo12.1
Keywords: tool steel|hot formability|tensile test|DTA|rolling temperature|
No 4 (2007), p. 625-632
  mag21.pdf (574 kB)
mag21_eng.txt (2 kB)  

Lenort R.
SIMULATION AS EFFECTIVE TOOL FOR ANALYSIS OF FLOATING CAPACITY BOTTLENECKS IN METALLURGICAL PRODUCTION
Keywords: floating capacity bottleneck|simulation|cutting line|hot rolled bars|analysis of metallurgical processes|
No 4 (2007), p. 633-641
  mag22.pdf (335 kB)
mag22_eng.txt (2 kB)  

Drápala J., Kozelková R., Vodárek V., Kubíček P., Vřešťál J., Kroupa A.
STUDY OF THE COPPER – INDIUM – TIN TERNARY SYSTEM BY MEANS OF REACTIVE DIFFUSION
Keywords: Copper–indium–tin ternary system|phase equilibria|reactive diffusion|WDX chemical microanalysis|thermodynamic calculation|
No 4 (2007), p. 642-653
  mag23.pdf (1 MB)
mag23_eng.txt (2 kB)  

Hanus A., Lichý P., Kozelský P., Čížek L., Cagala M.
THERMOMECHANICAL PROPERTIES OF MAGNESIUM ALLOY Mg0,7Zr
Keywords: relaxation properties at high temperatures|Mg alloy Mg0,7Zr|
No 4 (2007), p. 654-659
  mag24.pdf (453 kB)
mag24_eng.txt (2 kB)  

Aksenov S., Fabik R., Kliber J.
THE NUMERICAL PREDICTION OF FRICTION FORCES DISTRIBUTION WITHIN THE ROLL BITE WHEN HOT ROLLING STEEL
Keywords: Rolling friction|FEM|slab method|friction variation|mathematic simulation|
No 4 (2007), p. 660-666
  mag25.pdf (428 kB)
mag25_eng.txt (2 kB)