Abstract
Studies have been made of the corrosion fatigue of Zeron 100, super duplex stainless steel, in 3.5 percent NaCl solution. Fractography revealed that the crack propagation was due to hydrogen embrittlement of ferrite phase as indicated by brittle striations. The austenite phase either exhibited ductile tearing at low Δ K values or ductile striations at high Δ K values. The size of a brittle striation was found to be related to a constant strain relationship. From analyses it was found that the strain at the edge of the brittle striation was 4 percent for a range of Δ K values. Similar relationship was also found to be true for the values of brittle striation steps in Zeron 100 found for environmental fatigue in hydrogen gas and the brittle striations were wider than those found in brine solution.
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