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Year 2006 No 4

Drápala J., Zlatohlávek P., Smetana B., Vodárek V., Kursa M., Vřešťál J., Kroupa A.
STUDY OF SELECTED ALLOYS ON THE BASE OF THE COPPER – INDIUM – TIN TERNARY SYSTEM
Keywords: Copper – indium – tin ternary system|thermodynamic calculation|phase equilibria|heat treatment|DTA analysis|
No 4 (2006), p. 343-356
  mag01.pdf (1 MB)
mag01_eng.txt (2 kB)  

Greger M., Kocich R., Kander L .
SUPERPLASTICITY OF MAGNESIUM ALLOYS
Keywords: superplasticity|ARB|rolling|structure and properties|
No 4 (2006), p. 357-365
  mag02.pdf (1 MB)
mag02_eng.txt (2 kB)  

Strnadel, B., Kursa, M.
MODELLING RESIDUAL STRAINS DURING THE CYCLING OF TI-NI AND TI-NI-CU SHAPE MEMORY ALLOYS UNDER PSEUDOELASTICITY CONDITIONS
Keywords: shape memory alloys|Ti-Ni alloy|Ti-Ni-Cu alloy|pseudoelasticity|critical stress for inducing martensite|plastic strain propagation|
No 4 (2006), p. 366-378
  mag03.pdf (517 kB)
mag03_eng.txt (2 kB)  

Schindler I., Janošec M., Pachlopník R., Černý L.
MODELS OF HOT DEFORMATION RESISTANCE OF A NB-TI HSLA STEEL
Keywords: microalloyed steel|strain|equivalent stress|recrystallization|deformation resistance|forming force|
No 4 (2006), p. 379-387
  mag04.pdf (313 kB)
mag04_eng.txt (2 kB)  

Řeháčková L., Kalousek J., Dobrovská J., Stránský K., Dobrovský L.
ON METHODOLOGY OF CONCENTRATION DATA PROCESSING AT MATHEMATICAL MODELLING OF SUBSTITUTION ELEMENT DIFFUSION IN THE ZONE OF WELDED JOINT OF STEELS
Keywords: redistribution of substitution elements, diffusion|welded joint of steels|
No 4 (2006), p. 388-398
  mag05.pdf (373 kB)
mag05_eng.txt (2 kB)  

Řeháčková L., Kalousek J., Dobrovská J., Stránský K.
ON DETERMINATION OF THE DIFFUSION LAYER AND PENETRATION OF SUBSTITUTIVE ELEMENT IN WELDED JOINT OF TWO DIFFERENT STEELS
Keywords: diffusion|diffusion layer|modelling|welded joint of steels|
No 4 (2006), p. 399-404
  mag06.pdf (276 kB)
mag06_eng.txt (2 kB)  

Smíšek V., Kursa M.
EFFECT OF DIRECTIONAL CRYSTALLISATION ON MICROSTRUCTURE OF Ti 46Al-5Nb-1W ALLOY
Keywords: -TiAl|dendritic microstructure|lamellar microstructure|directional solidification|
No 4 (2006), p. 405-410
  mag07.pdf (990 kB)
mag07_eng.txt (2 kB)  

Szurman I., Kursa M., Jedlička Z.
TRANSFORMATION TEMPERATURES OF NI-TI BASED ALLOYS MEASURED BY RESISTOMETRIC AND THERMO-DILATOMETRIC METHODS
Keywords: Ni-Ti alloys|transformation temperature|resistometric method|dilatometric method|
No 4 (2006), p. 411-419
  mag08.pdf (359 kB)
mag08_eng.txt (2 kB)  

Losertová M. , Štěpán P.
THE EFFECT OF HYDROGEN ON THE EMBRITTLEMENT OF NiTi ALLOY
Keywords: Shape memory alloy|nickel-titanium|hydrogen embrittlement|hydrogen effect|AFM study|fractography|
No 4 (2006), p. 420-426
  mag09.pdf (877 kB)
mag09_eng.txt (2 kB)  

Malcharcziková J., Kursa M., Beljajev I. V.
IMPACT OF CONDITIONS OF DIRECTIONAL CRYSTALLISATION BY BRIDGMAN METHOD ON PHYSICAL AND METALLURGICAL CHARACTERISTICS OF Ni3Al
Keywords: Ni-Al based intermetallic compounds|tensile tests|acoustic emission|grain orientation|
No 4 (2006), p. 427-435
  mag10.pdf (689 kB)
mag10_eng.txt (2 kB)  

Jonšta Z., Jonšta P., Sojka J., Vodárek V.
STRUCTURAL PHASE ANALYSIS OF NICKEL SUPER-ALLOY INCONEL 713LC
Keywords: structural phase analysis|heat treatment|inter-metallic phase γ’|nickel super alloy|
No 4 (2006), p. 436-442
  mag11.pdf (963 kB)
mag11_eng.txt (2 kB)  

Hanus A., Lichý P., Kozelský P., Čížek L., Crha J.
THERMOMECHANICAL PROPERTIES OF MAGNESIUM ALLOYS – AZ61 BY USING ACOUSTIC EMISSION
Keywords: acoustic emission|relaxation properties at high temperatures|magnesium alloy|
No 4 (2006), p. 443-453
  mag12.pdf (759 kB)
mag12_eng.txt (2 kB)  

Žáček O., Kliber J., Schindler I.
TRIP STEEL THERMOMECHANICAL PROCESSING SIMULATION AND SUBSEQUENT MICROSTRUCTURE EVALUATION CONCEPTS
Keywords: TRIP steel|retained austenite|thermomechanical processing|laboratory rolling|metallography|
No 4 (2006), p. 454-461
  mag13.pdf (839 kB)
mag13_eng.txt (2 kB)  

Sojka J., Váňová P., Jonšta P., Rytířová L., Jerome M.
ROLE OF TESTING CONDITIONS IN SULPHIDE STRESS CRACKING OF X52 AND X60 API STEELS
Keywords: API steel|sulphide stress cracking|slow strain rate test|microstructure|
No 4 (2006), p. 462-468
  mag14.pdf (745 kB)
mag14_eng.txt (2 kB)  

Kubina T., Schindler I., Turoňová P., Heger M., Franz J., Liška M., Hlisníkovský M.
MATHEMATIC SIMULATION OF THE WEDGE ROLLING TEST AND COMPUTER PROCESSING OF LABORATORY RESULTS
Abstract
A simple laboratory test, performed by rolling of the wedge-shaped sample on plain rolls, enables to investigate the structure-forming processes and formability of metallic materials effectively, thanks to its ability to implement a wide range of height reductions in a single sample. The formed material’s spread induces tensile stresses at the sample’s lateral faces, which can yield in cracking. This method is very suitable for comparison of rollability of some materials with lower. Mathematical processing of the wedge rolling test’s results is complicated due to an irregular shape of the rolled stock. Hence the developed software represents an universal instrument for mathematical processing of results of the discussed test, which works reliably and independently on complexity of shape of the final rolled product. It is valid also in the case when the initial sample for the wedge rolling test is provided with notches of V shape, milled in the vertical direction on a lateral surface. These notches function as initiators of cracks and make it possible to better compare plastic properties of miscellaneous metallic materials. Deformation behaviour of the material close to these notches was subjected to FEM analysis by means of program FORGE 2005. The simulation confirmed an increased share of tensile stresses on the face of the notch and susceptibility to crack formation. At the same time the formation of laps during drawing the notch into the roll gap was confirmed. Knowledge gained by calculation are in full accordance with behaviour of the samples rolled in a laboratory rolling mill.

Keywords: wedge rolling test|formability|cracking|computer analysis|FEM|
No 4 (2006), p. 469-476
  mag15.pdf (393 kB)
mag15_eng.txt (2 kB)  

Rusz S., Schindler I., Kubina T., Bořuta J.
A NEW MATHEMATICAL MODEL DETERMINATING THE FORMING FACTOR
Keywords: hot flat rolling|forming factor|torsion test|mean equivalent stress|rolling force|
No 4 (2006), p. 477-483
  mag16.pdf (332 kB)
mag16_eng.txt (2 kB)  

Suchánek P., Schindler I., Kratochvíl P.
SIMPLE MODELS DESCRIBING HOT DEFORMATION RESISTANCE OF SELECTED IRON ALUMINIDES
Keywords: iron aluminides|laboratory hot rolling|rolling force|deformation resistance|
No 4 (2006), p. 484-489
  mag17.pdf (297 kB)
mag17_eng.txt (2 kB)  

Čížek L., Kocich R., Greger M., Praźmowski M., Tański T.
STUDY OF PLASTIC DEFORMATION OF MAGNESIUM ALLOYS WITH GRADUATE ALUMINIUM CONTENT
Keywords: magnesium alloys|mechanical properties|plasticity|heat treatment|metallographic and fracture analysis|
No 4 (2006), p. 490-496
  mag18.pdf (836 kB)
mag18_eng.txt (2 kB)