Analysis of mechanical properties of steels at elevated operating temperatures

Glavni cilj magistrskega dela je analiza mehanskih lastnosti jekel pri povišanih temperaturah obratovanja. Podrobno je predstavljena osnovna zgradba kovin, kristalnih struktur in natezni preizkus, ki je temelj za določanje lastnosti materialov. Natezni preizkus je standardiziran postopek, katerega predpisujeta ISO 6892-1 in ISO 6892-2, ki podajata pogoje za testiranje materialov. Cilj naloge je bil ugotoviti, kako se mehanske lastnosti jekla spreminjajo s povečevanjem temperature, ter kako na mehanske lastnosti jekla vpliva količina železa in ostalih legirnih elementov. Pri določanju vpliva temperature in kemijske sestave na mehanske lastnosti jekla smo izvedli kemijsko analizo vzorcev in natezni preizkus, ki se je izvajal v temperaturnem območju od 90 °C do 250 °C.The main objective of the MSc thesis is to analyse the mechanical properties of steels at elevated operating temperatures. The basic structure of metals, crystal structures and the tensile test, which is the basis for determining the properties of materials, are presented in detail. Tensile testing is a standardised procedure prescribed by ISO 6892-1 and ISO 6892-2, which specify the conditions for testing materials. The aim of the thesis was to determine how the mechanical properties of steel change with increasing temperature, and how the mechanical properties of steel are affected by the amount of iron and other alloying elements. To determine the effect of temperature and chemical composition on the mechanical properties of the steel, chemical analysis of the samples and tensile tests were carried out over a temperature range of 90 °C to 250 °C