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F. Vodopivec

Strain Ageing of Structural Steels
abstract, article page 143 - 148 pdf - 186 kB

E. V. Pereloma,
I. B. Timokhina,
A. I. Nosenkov,
J. J. Jonas

Role of Cr and P
Additions in the Development of Microstructure
abstract, article page 149 - 154 pdf - 264 kB

- Preparation of SiO₂ Powder through Leaching of Serpentine

A. Aláčová, J. Ficeriová,
M. Golja:
- Mechanochemistry and Preparation of Nanocrystalline Materials

I. Budić, G. Solenički:
- Influencing Parameters
on Homogeneity of
Aluminium Metal Foam AlSi12

F. Vovopivec - Strain ageing of structural steels

     The mechanism of ferrite strain ageing is explained in terms of interaction of carbon atoms in solution in ferrite and elastic stresses due to the presence of dislocations. After strain ageing tensile properties are changed to a different extent: yield stress and tensile strength are increased, reduction of area is decreased little and uniform elongation is decreased strongly. The increase of yield stress and the decrease of uniform elongation are smaller for steels with greater as delivered yield stress. Upper and lower shelf notch toughness are affected little, while the notch toughness transition temperature is increased significantly. The change of tensile properties is related mostly to the effect of steel plastic deformation, while the increase of notch toughness transition temperature is explained in terms of synergy of dislocation structure of the plastically deformed steel and interplane segregation of carbon atoms in solid solution in ferrite. pdf - 186 kB

E. V. Pereloma, I. B. Timokhina, A. I. Nosenkov, J. J. Jonas - Role of Cr and P Additions in the Development of Microstructure

     The recrystallisation behaviour of four warm rolled steels was investigated during annealing. The extra-low carbon (ELC) steel displayed the highest rate of recrystallisation, the steels with additions of chromium and phosphorus (LC(Cr)), (LC(Cr,P)) recrystallised at intermediate rates, while the interstitial-free (IF) steel exhibited the lowest rate. The additions of Cr and Cr/P increased the fraction of g-fibre in the annealing textures compared to that present in the ELC steel; this effect was particularly pronounced up to 50 % recrystallisation. After the completion of recrystallisation, the steel textures were characterized by a dominant g-fibre in the IF steel, while in the three LC steels, the RD fibre was the principal one. pdf - 264 kB

H. Hiebler, J. F. Plaul - Hydrogen Plasma Smelting Reduction - an Option for Steelmaking in the Future

     The steel industry is a mayor source of global CO₂-emission. Lager reductions of greenhouse gases are the challenge to develop new processes, like Hydrogen Plasma Smelting Reduction (HPSR). The scientific basis and results of HPSR laboratory experiments led to the development of a concept for an HPSR-plant on industrial scale. A technology assessment shows the potential for a cheaper and most environmental friendly steelmaking in the future, when extensive development work has been done. pdf - 257 kB

R. Kawalla, W. Lehnert - Qualität durch Umformung

     Die Qualitätsverbesserung bei gleichzeitiger Reduzierung der Herstellungskosten und Senkung des Fertigung-saufwandes sind nachhaltig vorgetragene Forderungen. Die Notwendigkeit der Produktionsumstellung auf eine prozessstufenarme Fertigung bei Beachtung sozialökologischer Aspekte wird immer eindringlicher nachgewiesen und verlangt. Viele Forschungsarbeiten zur Entwicklung von Werkstoffen und Werkstofftechnologien sind auf diese Zielstellungen ausgerichtet worden. Sie haben zur Verfahrensrationalisierung und Gütesteigerung beigetragen. Die erreichten Technologiefortschritte zur Herstellung von warmgewalzten Stabstählen und Drähten waren ausschlaggebend, dass deren Produktqualität und Gebrauchswert in bemerkenswerter Weise gesteigert werden konnten. Das hat sich in den nachfolgenden Industriezweigen in vielfältiger und sichtbarer Art günstig ausgewirkt. Sie sind dies Basis, noch höhere Qualitätsniveaus anzuvisieren. pdf - 295 kB

Ľ. Mihok - Quality Management Systems - New Approach by ISO 9000/2000

    The paper presents information on new standards for quality management systems, ISO 9000/2000. Differences between the set of ISO 9000/1994 standards, that are not valid now, and a new one are presented. Special interest is focused on new features of the system, e.g. process approach, flexibilty of the standards regarding their use in all kinds of work organizations, documentation of the system, principles of continual improvement, self-assesment of the organization. pdf - 120 kB

M. Gojić - Current State and Development of Steelmaking Processes

    During 2003 year a total world’s crude steel production was 945,1 Mt, which is for 6,7 % higher than in 2002. The paper shows current state steelmaking processes (Basic Oxygen Converter and Electric Arc Furnace) including a short review of secondary metallurgy, steel casting and environmental protective as well as the development of a new steelmaking processes. pdf - 127 kB

V. M. Drujan, I. Mamuzić - Techno - Economic Indikators of Seamless Tube Production

    First the paper presents a review of steel tubes production, especially seamless tubes. The tube production varied from about 74×10⁶ tons down to 50×10⁶ tons. This applies to seamless tubes (world ratio - welded tubes: seamless tubes was 70 : 30 %). Further in the article are presented the main characteristics of rolling stands for productions of seamless tubes and an analysis of techno - economic indicators. Development tendency at production of tubes as shown in tabular form. pdf - 113 kB

V. A. Grynkevych, I. Mamuzić, V. M. Danchenko - On Development of Methods of Computer Simulation for Processes of Metal Forming

     The comparative analysis of the main modern methods of the solution of metal forming boundary value problems is executed. The brief retrospective review of development of methods of the solution of metal forming boundary value problems (including methods of computer simulation) is made. The new method of computer simulation of metal forming processes. It is a method of linearization of nonlinear problems and is based on the variation of a finite element method. The outcomes of computer simulation of the upsetting process of stuffs with different flow characteristics is presented. The offered method and its modifications allow considerably to reduce time of the solution of boundary value problems, providing sufficient veracity of outcomes. pdf - 118 kB

ACHIVES 1996 - 2000 (under construction)
Author(s) - Ttitle of the article - Abstract

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