The Influence of Hydrogen Embrittlement on Mechanical Properties of Advanced High-Strength Structural Steel S960MC

Abstract. A lot of emphasis is currently being paid to research into how hydrogen affects the mechanical properties of advanced high-strength (AHS) steels. The use of AHS steels in the chemical industry and nuclear technology is heavily influenced by the mechanical properties that result from the impact of hydrogen. Hydrogen, an interstitial element, alters fracture behavior and causes the material to fail earlier than it should. The greatest danger occurs after hydrogen has been absorbed when it diffuses and accumulates into defects such grain boundaries, dislocations, and phase boundaries. The crystal structure of the steel enlarges due to tensile stresses, which increases hydrogen diffusion. Cold forming creates a multitude of components, and even a small amount of hydrogen absorption could result in significant residual stresses in the material. The steel can experience a significant reduction in mechanical properties, strength, and ductility up to fracture at a critical hydrogen concentration level. It is impossible to preventively remove components that have been harmed by hydrogen before they are utilized, which is the primary issue with hydrogen embrittlement from a safety perspective.