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Year 2006 No 1

Lothongkum G., Khuanlieng W., Homkrajai W., Wangyao P.
EFFECT OF PRE-HEAT TREATMENTS ON NANO Γ’ PRECIPITATION AND MECHANICAL PROPERTIES IN WROUGHT NICKEL BASE SUPERALLOY, X-750
Keywords: Heat treatment|Aging|Wrought Nickel-Based Superalloy|Microstructure|Mechanical Properties|
No 1 (2006), p. 7-13
  mag01.pdf (1 000 kB)
mag01_eng.txt (2 kB)  

Blach J., Ševc P.
INFLUENCE OF COLD DEFORMATION BEFORE EXPLOITATION ON IMPACT TOUGHNESS OF EXPOSED P91 STEEL
Keywords: P91 steel|cold deformation|heat treatment|secondary phase precipitation|impact toughness|ductile fracture|
No 1 (2006), p. 14-22
  mag02.pdf (675 kB)
mag02_eng.txt (2 kB)  

Wangyao P., Krongtong V., Homkrajai W., Polsilapa S., Lothongkum G.
COMPARING REJUVENATED MICROSTRUCTURES AFTER HIP PROCESS AND DIFFERENT HEAT TREATMENTS IN CAST NICKEL BASE SUPERALLOYS, IN-738 AND GTD-111 AFTER
Keywords: Hot Isostatic Pressing (HIP)|Rejuvenation|Re-heat treatment|Microstructural Repair|Cast Nickel-Based Superalloy|
No 1 (2006), p. 23-32
  mag03.pdf (2 MB)
mag03_eng.txt (2 kB)  

Pernis R.
DRAW DIE WITH TRACTRIX CURVE
Keywords: deep drawing|draw die|draw curve|tractrix|equidistance equation|equidistance tractrix|
No 1 (2006), p. 33-41
  mag04.pdf (310 kB)
mag04_eng.txt (2 kB)  

Havlík T., Vidor e Souza B., Bernardes A. M., Schneider I. A. H., Miškufová A.
HYDROMETALLURGICAL PROCESSING OF CARBON STEEL ELECTRIC ARC FURNACE DUST
Keywords: electric arc furnace steelmaking dust|carbon steel|zinc|iron|sulphuric acid|leaching|hydrometallurgy|industrial waste|
No 1 (2006), p. 42-53
  mag05.pdf (602 kB)
mag05_eng.txt (1 kB)  

Bidulský R., Rodziňák D., Guzanová A., Brezinová J.
EFFECT OF SHOT PEENING ON FATIGUE FAILURE RESISTANCE OF SINTERED STEELS
Keywords: Sintered Steels|Shot peening|Fatigue test|S N diagrams|
No 1 (2006), p. 54-58
  mag06.pdf (233 kB)
mag06_eng.txt (2 kB)  

Molnárová M., Leško A., Vlado M.
DETERMINATION OF CRITICAL TIN PLATE THICKNESS FOR SURFACE PENETRATION OF ROLLED IN OXIDES
Keywords: tin plate|surface defects|hot rolling|cold rolling|critical plate thickness|structure|optical microscopy|SEM|EDX|
No 1 (2006), p. 59-68
  mag07.pdf (677 kB)
mag07_eng.txt (2 kB)  

Gulová L., Peregrin S., Kováč J., Beháň B.,Luptak M., Lukačin. M., Valíček J.
THE CAUSES OF TRANSVERSE CORNER CRACKS ON THE SURFACE OF CONTINUOUS CAST SLABS AND METHODS OF ELIMINATING THEM
Keywords: continuous cast slabs|surface defects|transverse corner cracks|surface defects of sheets|
No 1 (2006), p. 69-77
  mag08.pdf (571 kB)
mag08_eng.txt (2 kB)  

Bidulská J., Kvačkaj T., Vrchovinský, V., Bidulský R.
FORMABILITY EVALUATION OF ALUMINUM ALLOY 2014 BY MEANS OF TENSILE TEST
Abstract
The hot forming of metals is carried out by means of various laboratory tests. The behaviour of the metal depends on the precise combination of the parameters temperature-deformation-time-stress factor. The hot workability test is usually done by performing the material under the conditions where the analysis of the stress-strain relation is easily carried out. The torsion test is of frequent use for assessing hot workability of metals, and in terms of different stress factors for assessing hot workability of metals performed tensile test. The stress-strain curves are the result of mentioned laboratory test. The one of the characteristics that governs hot tensile test is formability. The article deals with hot-forming characteristics of aluminium alloy 2014 stabilized Zr. Deformation characteristics performed by hot tensile test. From hot tensile test is achieved a stress-strain relationship at constant deformation rate and temperature, that are called deformation curves. Formability is very important properties, evaluated from tensile test. This is area of plastic deformation, in which is material tested before fracture. The hot tensile tests were carried out on a computer controlled hot tensile machine at temperatures from 300 to 500°C at constant deformation rate of 0.1 mm/min. Every curve shows a rapid increase in the stress to a peak value, followed by a gradual decrease towards a steady state regime which is not reached before fracture. The value of properties slightly increasing with applied deformation temperature to maximum at 400°C and following decreased formability of investigated materials. This material behaviour is connected with fractured mechanism at elevated temperature. The highest values of mechanical properties were achieved at temperature 400°C: tensile strength Rm = 30.5 MPa, yield strength Re = 29 MPa, tensile strain A5 = 72.5 % and elongation Z = 29 %.

Keywords: Formability|aluminium alloy 2014|hot tensile test|stress-strain curve|
No 1 (2006), p. 78-82
  mag09.pdf (272 kB)
mag09_eng.txt (2 kB)  

Petrík J., Szarvasy P., Špeťuch V.
CAPABILITY OF AL-SI ALLOY HARDNESS MEASUREMENT PROCESS
Keywords: capability|Al-Si alloy|hardness|
No 1 (2006), p. 83-93
  mag10.pdf (466 kB)
mag10_eng.txt (7 kB)