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Hydrogen Susceptibility of Nanostructured Bainitic Steels
Summary
Researchers tested how hydrogen exposure affects the strength and flexibility of ultra-strong nanostructured steel alloys, finding that hydrogen significantly reduced ductility and tensile strength regardless of how much retained austenite — a specific steel microstructure — was present. The results suggest that grain boundary surface area, not austenite content alone, controls how much hydrogen the steel absorbs.
Abstract Nanostructured steels with an ultimate tensile strength of 1.6 GPa were produced with austenite content varying from 0 to 35 vol pct. The effect on the mechanical properties was assessed after saturating the steel with hydrogen. Elongation was reduced to 2 to 5 pct and UTS to 65 to 70 pct of prior value. Thermal desorption measurements confirmed the higher solubility of hydrogen in the steel with higher austenite content. The level of hydrogen saturation was found to correlate to the total area of grain boundaries rather than to the volume fraction of retained austenite.
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