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Year 2005 No 3

Dobrovský Ľ., Řeháčková L., Dobrovská J., Stránský K., Dobrovská V.
PREDICTION OF CARBON DISTRIBUTION IN WELDED JOINTS OF STEELS
Keywords: Quasi-stationary diffusion|welded joints of steels|interstitial elements|carbon|
No 3 (2005), p. 259-265
  mag01.pdf (172 kB)
mag01_eng.txt (2 kB)  

Noga Z.
LABORATORY PLASMA EQUIPMENT TO THE SEMI-CONTINUAL MATERIAL MELTING AND PROCESS
Keywords: Development of research equipment|plasma torch|horizontal-vertical water cooled copper crucible|electric heating–treatment furnace|forming machines|
No 3 (2005), p. 266-276
  mag02.pdf (948 kB)
mag02_eng.txt (3 kB)  

Kocich R., Greger M.
DEVELOPMENT OF STRUCTURE AND MECHANICAL PROPERTIES IN AZ91 ALLOY USING BY ARB PROCESS
Keywords: Plastic deformation|grain size|magnesium alloy|mechanical properties|
No 3 (2005), p. 277-283
  mag03.pdf (735 kB)
mag03_eng.txt (1 kB)  

Szurman I., Kursa M.
INFLUENCE OF CONDITIONS OF PREPARATION ON STRUCTURAL CHARACTERISTICS OF NI-TI ALLOYS
Keywords: Ni-Ti shape memory alloys|plasma melting|vacuum induction melting|
No 3 (2005), p. 284-292
  mag04.pdf (539 kB)
mag04_eng.txt (2 kB)  

Smíšek V., Kursa M.
POSSIBILITIES OF AFFECTING THE LAMELLAR MICROSTRUCTURE OF TI 46AL-5NB-1W ALLOY BY DIRECTIONAL CRYSTALLISATION
Keywords: titanium aluminide|directional solidification|directional crystallisation|microstructure|
No 3 (2005), p. 293-300
  mag05.pdf (413 kB)
mag05_eng.txt (1 kB)  

Bujnošková K., Drápala J.
SEGREGATION PHENOMENA IN REFRACTORY METALS DURING ZONE MELTING
Keywords: Segregation|refractory metals|molybdenum|tungsten|segregation coefficient|concentration undercooling|convection|
No 3 (2005), p. 301-310
  mag06.pdf (308 kB)
mag06_eng.txt (2 kB)  

Bystrianský J., Siegl J., Haušid P., Strnadel B.
THERMAL FATIGUE OF STAINLESS STEELS
Keywords: Stainless steel|thermal shock|thermal fatigue|fatigue crack|thermal cycle|
No 3 (2005), p. 311-322
  mag07.pdf (2 MB)
mag07_eng.txt (2 kB)  

Bystrianský J., Siegl J., Haušid P., Strnadel B.
THERMAL FATIGUE OF STAINLESS STEELS
Keywords: Stainless steel|thermal shock|thermal fatigue|fatigue crack|thermal cycle|
No 3 (2005), p. 311-322
  mag08.pdf (2 MB)
mag08_eng.txt (2 kB)  

Sojka J., Jonšta P., Rytířová L., Sozańska M., Jerôme M.
INFLUENCE OF MICROSTRUCTURE ON SULPHIDE STRESS CRACKING OF HOT ROLLED TUBES
Keywords: Sulphide stress cracking|carbon steel|segregation bands|hydrogen permeation|
No 3 (2005), p. 332-330
  mag09.pdf (865 kB)
mag09_eng.txt (2 kB)  

Schindler I., Fiala J., Černý L., Kohut J., Kozelský P., Suchánek P.
DEFORMATION BEHAVIOR AND MICROSTRUCTURE DEVELOPMENT OF 13CR25 FERRITIC STAINLESS STEEL IN HOT STRIP ROLLING
Keywords: High-alloy ferritic steel|hot strip rolling|simulation|recrystallization|recovery|grain size|mean equivalent stress|
No 3 (2005), p. 331-340
  mag10.pdf (1 MB)
mag10_eng.txt (2 kB)  

Fabík R., Kliber J.
INVERSE ANALYSIS CALCULATION OF HEAT TRANSFER COEFFICIENT FOR FEM SIMULATION OF RAILS HARDENING
Keywords: cooling curves|inverse analysis|FEM|heat transfer coefficient|
No 3 (2005), p. 341-350
  mag11.pdf (1 MB)
mag11_eng.txt (2 kB)  

Heger M. , Schindler I., Franz J., Špička I., Turoňová P., Černý L.
POSSIBILITIES OF COMPUTER ANALYSIS EXPLOITATION IN THE PROCESS OF SOLUTION SOME TASKS CONNECTED WITH MATERIAL FORMING
Keywords: Rolling|equivalent strain|strain rate|computer analysis|
No 3 (2005), p. 351-361
  mag12.pdf (1 MB)
mag12_eng.txt (2 kB)  

Kubina T., Schindler I., Heger M., Plura J., Bořuta J., Dänemark J., Hadasik E.
STATISTICAL COMPARISON OF DIFFERENT METHODS OF CALCULATION OF PARAMETERS DESCRIBING DYNAMIC RECRYSTALLIZATION
Abstract
Program ENERGY 4.0, developed for calculation of parameters describing dynamic recrystallization (DRX), includes now two ways of methodology of calculation. Input data coming from the torsion plastometer SETARAM - VÍTKOVICE is first processed by a conventional method of successive linear regressions. In this stage the exclusion of temperature levels is carried out, in which a state featured by one phase of tested steels is not maintained. The following automatic computation using the simplex algorithm of non-linear regression can make particular parameters for a description of DRX more precise. Those calculations are entirely objective and yield in the least statistical errors but their results can not always match up the physical-based idea. In total 22 steels of different chemical composition - from simple structural steels, through microalloyed steels of various types, high alloyed tool steels up to corrosion-resisting (stainless) austenitic steels - were included in the analyzed data set. A key (decisive) criterion for including in an evaluated group of steels was maintaining of mono-phase structural state in the whole range of evaluated temperatures of testing. One can compare influence of both methods on calculated parameters, as well as accuracy of both methods in determination of values of the maximum stress and peak to strain.

Keywords: Activation energy|hot forming|steel|dynamic recrystallization|
No 3 (2005), p. 362-368
  mag13.pdf (332 kB)
mag13_eng.txt (1 kB)  

Lasek S., Drápala J., Urbaníková Ž., Blahetová M.
COMPARISON OF ELECTROCHEMICAL CORROSION PROPERTIES OF SELECTED LEAD-FREE SOLDERS
Keywords: Tin alloys|lead-free solders|electrochemical corrosion|potentiodynamic polarization method|
No 3 (2005), p. 369-374
  mag14.pdf (220 kB)
mag14_eng.txt (2 kB)