Ultra-high strength steels are widely utilized in many applications operating harsh abrasive wear conditions. For instance, the machineries used mining and mineral handling or agricultural sector require robust, but cost-effective wear-resistant materials. Steels provide excellent combination of mechanical properties usability. This study encompasses testing an experimental medium-carbon press-...

This work investigates and compares the fatigue performance of laser-welded joints two press hardening steels: a standard 22MnB5 variant modified by combination niobium molybdenum (NbMo) alloying. The results indicate that joint geometry aspects, superposed to an intrusion-generated damage mechanism, were prevalent in causing poor life case peak stress values greater than 11% base metal's ultim...

Two ferrite/martensitic (F/M) steels with different Si concentrations (0 and 0.4 wt.%) were irradiated by 250 keV He2+ ions fluences of 2 × 1016 ions/cm2 1 1017 ions/cm2. Transmission electron microscopy a nanoindenter employed to investigate their microstructure evolution irradiation hardening effects induced high-energy ions. A large number He bubbles formed in the Si-free Si-containing F/M s...

The information about the quantitative effects of alloy elements on the hot strength of steels is scarce and contradictory. Its effects can change according to alloy content and specific conditions of the hot forming process, as they can activate different hardening or softening mechanisms. Three empirical approaches were initially adopted in this work to rank and model hot strength in steels i...

It is crucial for the carbon concentration of 9% Cr steel to be reduced to a very low level, so as to promote the formation of MX nitrides rich in vanadium as very fine and thermally stable particles to enable prolonged periods of exposure at elevated temperatures and also to eliminate Cr-rich carbides M23C6. Sub-boundary hardening, which is inversely proportional to the width of laths and bloc...