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Abstract The nucleation and propagation of stress corrosion cracking(SCC)of four low-alloy steels with a wide range of tensile strength in H_2S were followed me- tallographically,using polished WOL type constant deflection specimen.Results show that if K_I>K_(ISCC),the size of the plastically deformed zone and the degree of Plastic deformation ahead of the crack is enlarged continuously with time,i.e.,a delayed plastic deformation is observed,and SCC will nuc- leate and propagate when it develops to a critical condition.It was proved that the delayed plastic deformation observed on the surface of a specimen did not caused by pre-produced SCC in the interior of the specimen,but induced by hydrogen and was called hydrogen induced delayed plasticity(HIDP). For ultra-hlgh strength steels after the closure of the hydrogen induced delay- ed plastic deformation zones,the SCC were nucleated at their tips.These dis- continuous cracks would grow and join one another with the progress of the HIDP.For lower strength steels,the SCC propagated continuously along a path near the border of the delayed plastic/elastic region with the enlargement of the HIDP. The variation of K_(ISCC) and da/dt in H_2S with the strength of steels were investigated and compared with that in water.The inflenee of the cathodic and anodic polarization on K_(ISCC) and da/dt of the ultra-high strength steel in H_2S was also investigated.
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Received: 25 April 1981
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