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Petrovic D.S.,Slovenian Institute of Metals And Technology
ISIJ International | Year: 2011

The effect of selenium on the oxidation of Fe-Si-Al-C alloy during decarburization at 840°C in wet hydrogen was studied. Selenium was found to change the morphology of internal oxides of an Fe-Si-Al-C alloy. The long penetrating internal oxides of Si and Al in the alloy containing 0.034 at.% Se demonstrate an obvious preferential growth perpendicular to the steel substrate. FEG-SEM/EDX was performed to analyze the scale and the subscale. It was assumed that columnar morphology of internal oxides could be induced by selenium surface segregation. Therefore, in-situ AES analysis using a resistive heating of specimen in UHV was used to obtain more accurate data on temperature dependence of selenium surface segregation in silicon steel. Additionally, the kinetics of the selenium surface segregation was investigated in-situ during annealing at 840°C in the ultra-high vacuum chamber of a field-emission Auger electron spectrometer. © 2011 ISIJ. Source


Petrovic D.S.,Slovenian Institute of Metals And Technology
Materiali in Tehnologije | Year: 2010

Non-oriented electrical steel sheets are sheets tailored to produce specific properties and are produced from Fe-Si or Fe-Si-Al alloys. Non-oriented electrical steel sheets are incorporated into a wide range of equipment, from the simplest domestic appliances to hybrid and pure electric vehicles. Future efforts will be focused on controlling the residual elements in the steel, optimizing the hot and cold rolling, and optimizing the crystallographic texture development, with the aim to enhance the performance of the finished product. Source


Kovacic M.,Store Steel Ltd. | Kovacic M.,University of Nova Gorica | Sarler B.,University of Nova Gorica | Sarler B.,Slovenian Institute of Metals And Technology
Energy | Year: 2014

The Energy Agency of the Republic of Slovenia regulates and determines the operations of the natural-gas market, charges for related gas imbalances, decides on suppliers and controls penalty provisions relating to breaches of stipulated provisions. Each supplier regulates and determines the charges for the differences between the ordered (predicted) and the actually supplied quantities. Štore Steel Company is one of the major spring-steel producers in Europe. Its natural gas consumption represents approximately 1.1% of Slovenia's national natural gas consumption. The company is contractually bound to a supplier which exacts penalties according to the differences mentioned above. A successful approach to gas consumption prediction is elaborated in this paper, with the aim of minimizing associated costs. In the attempt to model and predict the gas consumption and, accordingly, to minimize ordered and supplied gas quantity error, we used linear regression and the genetic programming approach. The genetic programming model performs approximately two times more favorably. The developed gas consumption model has been used in practice since April 2005. The results show good agreement between the model-based ordered quantities and the actually supplied quantities, with savings amounting to approximately 100,000EUR per year. © 2014 Elsevier Ltd. Source


Skobir D.A.,Slovenian Institute of Metals And Technology
Materiali in Tehnologije | Year: 2011

Micro-alloyed, high-strength, low-alloy (HSLA) steels are important structural materials and contain small amounts of alloying elements, such as niobium, titanium, vanadium, and aluminium, which enhance the strength through the formation of stable carbides, nitrides or carbonitrides and have an effect on the hardenability. Such steels contain less than 0.1 % of the alloying additions, used individually or in combination. Yield strength increments of two or three times that of plain carbon-manganese steel can be attained. Nowadays, also micro-alloyed cast steels have found many applications in the manufacturing of industrial parts that used to be produced by more expensive manufacturing processes. Source


Sedlacek M.,University of Ljubljana | Podgornik B.,Slovenian Institute of Metals And Technology | Vizintin J.,University of Ljubljana
Tribology International | Year: 2012

The aim of the present research was to investigate the correlation between surface roughness parameters and friction. For this purpose 100Cr6 steel plate samples were prepared using different grades and combinations of grinding and polishing in terms of similar S a but different S sk and S ku values. Dry and lubricated pin-on-disc tests, using different contact conditions, were carried out, using Al 2O 3 ball as counter-body. Test results show that surfaces with higher S ku and negative S sk values tend to reduce friction. © 2012 Elsevier Ltd. All rights reserved. Source

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