Authors

The Influence of Copper on
the Microtexture of Fe-Si-Al Alloys for Non-Oriented Electrical Sheets
abstract, article page 75 - 78 pdf - 1233 kB

Correlation of Creep-Rupture Data for Complex Alloys at Elevated Temperatures
abstract, article page 79 - 85 pdf - 2322 kB

D. Steiner Petrovič, M. Jenko, M. Godec, F. Vodopivec, M. Jeram, V. Prešern - The Influence of Copper on the Microtexture of Fe-Si-Al Alloys for Non-Oriented Electrical Sheets

    The effect of copper content in the range of 0,01 - 0,6 wt.% on the microtexture of some Fe-Si-Al non-oriented electrical sheets containing several impurity elements was investigated. The sheets were laboratory-manufactured and industrial samples of non-oriented electrical steels, decarburized and recrystallized, before the final annealing. Using the EBSD (electron backscatter diffraction) the microtexture was determined. It was found that the microtexture of the alloys containing more copper had fewer crystal grains with easy direction of magnetization in the sheet rolling plane. It was concluded that copper has a negative influence on the magnetic properties of soft-magnetic steel sheets. pdf - 1233 kB

V. Krivenyuk, I. Mamuzić - Correlation of Creep-Rupture Data for Complex Alloys at Elevated Temperatures

     The main tendency towards the development of the methods for predicting long-time data on of metallic materials is to derive the correlation relationships, which should be as general as possible. This paper presents the verification of the fact that a sufficiently accurate estimation of the peculiarities of the portions of experimental diagrams and generalization of this information can be of great importance for a considerable progress in the prediction. pdf - 2322 kB

M. Zrilić, M. Rakin, Lj. Milović, Z. Burzić, V. Grabulov - Experimental and Numerical Evaluation of a Steamline Behaviour Using Local Approach

    Results of the experimental and numerical comparative analysis of steamline pipes have been presented. New pipes and the pipes used for more than 117,000 hours at 540 °C under pressure of 42 bars have been simultaneously tested. This testing has been carried out because frequent failures of the equipment components exposed to elevated temperatures, such as steam pipelines, make it necessary to pay particular attention to the analysis of the materials used. The most frequent failures were those connected with occurrence of cracks, particularly expressed in case of steel 14MoV6 3. Local approach to fracture has been developed for complete understanding of fracture mechanism. This approach combines theoretical, experimental and numerical solutions. pdf - 1940 kB

N. I. Grechanyuk, I. Mamuzić, V. V. Bukhanovsky - Production Technology, Physical, Mechanical and Performance Characteristics of Cu-Zr-Y-Mo Finely-Dispersed Microlayer Composite Materials

    The production of Cu-Zr-Y-Mo Finely-Dispersed (FD) microlayer composite materials for electrical contacts by the method of electron-beam evaporation and layer-by-layer condensation from the vapor phase is described and the chemical composition, structure, density, electrical conductivity, hardness, and main mechanical characteristics of the materials in the temperature range from 290 to 1070 K are studied. pdf - 1008 kB

I. Kladarić, D. Krumes, I. Vitez - The Influence of Retained Austenite on Precipitation Hardening of Maraging Steel

    The investigation of the influence of multiple solution-annealing on kinetics of structural transformation of maraging steels has shown that procedures of solution annealing are not totally reversible. Recurrent solution annealing results in the increase of the retained austenite share in maraging steel structure. In this paper the influence of retained austenite on precipitation hardening of maraging steels X2NiCoMo18-9-5 was determined. The laboratory experimental tests have shown that the growth of retained austenite share in the maraging steel structure decreases the hardness after aging. pdf - 1040 kB

J. Tušek, B. Bajcer, B. Taljat, M. Hrženjak - Analysis of Lack of Fusion in Welds at Water Heaters

     The paper treats a weld discontinuity called lack of fusion, which is frequently a cause of leakage of a water heater. The heater was produced by MAG welding using two wires (twin arc welding). The paper states some reasons for the occurrence of lack of fusion, i.e. the arc blow effect, an inappropriate gun position, uncontrolled movement of the weld pool, too low energy input, an improper joint preparation. The defect is illustrated in a macrograph of a weld produced at the water heater with twin wires in a shielding gas. Welding with twin wires is schematically represented with a circumferential welded joint between the end and shell of the water heater. pdf - 2148 kB

V. Marušić, I. Budić, T. Šarić - Investigation of Causes of Scrap Occurrence in Thread Cutting on Steel Sleeves for Motorcar Industry

      This paper studies causes of scrap occurrence, wear and breakage of cutters during thread cutting of steel sleeves poured in Al die castings of motor car engine components. It was concluded that the reason for occurrence of problems with thread cutting of sleeves most probably should be attributed to the fact whether hardness value reaches 200 HB or over 250 HB. The most probable reason for over wear and consequently to breakage of cutters and scrap occurrence, although castings display top quality, lies in the fact that the internal diameter of sleeves frequently falls down under minimally allowed tolerances for threaded sleeves. pdf - 1972 kB

E. Staniewska - The Logistics of the Strategic Materials Supply in the Metallurgical Enterprise

      In conditions of market economy the supply has to achieve new challenges because the quality and efficiency of functioning in this area influences in a large degree all fields of enterprise activity and its results. The supply issue and the cost reduction should be one of the basic elements of the enterprise strategy. In the article the purchase policy and supply aspects of logistics in strategic materials in the metallurgical enterprise are discussed. pdf - 926 kB

R. Budzik - The Balance of Titanium and Vanadium in the Blast Furnace with the Use of Sinter Containing a Titanium-Vanadium-Magnetite Concentrate

      The investigation concerned the use of sinter containing a titanium-vanadium-magnetite concentrate for the production of pig iron. Sinter containing 0,46 to 0,51 % TiO₂ and 0,056 to 0,060 % vanadium was used for pig iron production in the blast furnace. Introducing 200 kg of this concentrate to the1 Mg sinter mix did not cause any deterioration of sinter quality. pdf - 1332 kB