modern vehicle bodies make intensive use of high strength steel grades to meet the contradicting demand of lighter weight and simultaneously better mechanical performance. for many steel grades microalloying by niobium is the key to achieve their characteristic property profile. in hsla steels niobium enhances the strength primarily by grain refinement. in interstitial free high strength steels...

Modern vehicle bodies make intensive use of high strength steel grades to meet the contradicting demand of lighter weight and simultaneously better mechanical performance. For many steel grades microalloying by niobium is the key to achieve their characteristic property profile. In HSLA steels niobium enhances the strength primarily by grain refinement. In interstitial free high strength steels...

In hot rolled products, which are the subject of other presentations here, vanadium has been used for many years in high strength products, often in combination with other microalloying additions such as niobium or titanium. Vanadium can provide important contributions via both precipitation strengthening and ferrite grain refinement (due to austenite conditioning during thermomechanical proces...

Investigations were conducted on low-carbon steel and the steel with same chemical composition with addition of microalloying element niobium. While tensile testing was carried out, the thermographic measurement was tacking place simultaneously. A specific behavior of niobium microalloyed steel was noticed. Test results have shown that, in the elastic deformation region, thermoelastic effect oc...

The aim of this paper is to evaluate the influence small variations in chemical composition on corrosion resistance and mechanical properties low-manganese medium manganese high strength steels. Six different steels with content varying from 1.5 4.0 wt.% aluminium 0.008 6.5 were subjected analysis. other subjects for evaluation included effect as a replacement silicon, niobium microalloying hea...

The influence of austenitizing temperature and austenite grain size on the crystallographic characteristics mechanical properties transformation products was investigated in a low-alloy steel. Annealing at lower after austenitization 1050 °C can reduce vacancy concentration enhance stability austenite, thereby determining martensite-start (Ms) density twin-related V1/V2 variant pairs. pairs are...

Abstract The aim of this work is to study the effect zirconium and niobium on refinement grain size mechanical properties micro-alloyed cast steels in heat treated conditions. Five with different compositions, as steel without microalloying elements (i) 0.05% Zirconium (Zr), (ii) (Zr) Niobium (Nb), (iii) 0.10% (iv) (Nb) were investigated. samples are normalized at 1000 °C followed by air coolin...

The influence of the nickel content and cooling rate on niobium nitride precipitation in as-cast stainless steels were analysed. Niobium microalloying is important for mechanical properties prevention intergranular corrosion steels. However, coarse precipitates can negatively affect steel properties. NbN depends thermodynamic conditions, which are dictated by chemical composition temperature. c...