Embrittlement of a Duplex Stainless Steel in Acidic Environment Under Applied Cathodic Potentials |
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Authors: | S Roychowdhury Vivekanand Kain |
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Affiliation: | (1) Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India |
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Abstract: | Hydrogen-induced degradation of mechanical properties of a duplex stainless steel in 0.1N H2SO4 solution has been studied under in situ cathodic charging conditions. Significant reductions in percentage of elongation,
toughness, and time to failure were noticed due to the ingress of hydrogen into the material at various applied cathodic potentials
in the range of −200 to −800 mV (SCE). Cleavage fractures were identified mainly in the ferritic phases. Crack growth was
observed to be inhibited by the austenite phase. However, depending on the severity of the environment, both the ferrite and
austenite phases could be embrittled. At less negative potentials, presence of surface film and low hydrogen fugacity seemed
to control hydrogen ingress in the metal. Addition of thiosulfate to the acidic solution further degraded the mechanical properties
of the steel at the applied cathodic potential. |
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Keywords: | ductility duplex stainless steel fracture hydrogen embrittlement toughness |
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