| Stress corrosion cracking (SCC) testing on Fe-Mn-Al alloys has been carried out in the boiling 42% MgCl₂ solution, and the effects of phase difference or of some chemical contents on SCC sensitivity have been studied. Comparing with the austenitic 18-8 stainless steel, Fe-Mn-Al alloy of austenitic structure has shown much higher resistivity to SCC. By increasing the ferrite phase in the dual phase (γ+α) Fe-Mn-Al alloys, SCC sensitivity was increased. Under the studied condition, pitting occurred more easily at ferrite phase than at austenite phase. These pittings acted as the crack initiation sites, resulting in increased SCC sensitivity. Silicon-added austenitic Fe-Mn-Al alloy has shown increased SCC sensitivity than without it. Increased carbon content of the similar dual phase alloys, resulted in the higher SCC sensitivity. |
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