Effect of Metallurgy on Stress Corrosion Cracking and Hydrogen Embrittlement of Ultra/High Strength Steels

Fracture toughness of hydrogen charged as-quenched ultra-high-strength steels at low temperatures

“…The degradation of the notch tensile strength of tempered martensite as a function of diffusible hydrogen content was found to obey a power law type of behaviour [17]. Similar findings about toughness have been reported by Tvrdy et al [13] who reported that the static threshold fracture toughness value of UHSS dropped from around 80 to a level of 0.5 M NaCl solution. Based on the loss of ductility linear relationship has been established for as-quenched and quenched and low-temperature tempered steels between tensile strength and the critical total hydrogen content that is needed to lower the elongation to fracture by 20 % (H cD0.8 ) [15,16].…”