Slow strain rate technique for studying hydrogen induced cracking in 34CrMo4 high strength steel

Alloy hardened steels offer excellent combination of mechanical properties, hardenability and corrosion resistance. 34CrMo4 is a medium carbon, low alloy steel widely used due to good high-strength, toughness wear However, this experiences hydrogen embrittlement (HE), complex phenomenon depending on the composition microstructure. This work estimates de loss properties caused by in electrochemically H-charged specimens absence stress but also, at strain rate constant load. H-charging for 2 6 h induce YS losses about 40% 71% UTS 39% 59%, respectively. The synergistic effect process leads higher loss, 91%, faster brittle fracture even though content similar those firstly then tested air.