Abstract
The microstructure and stress corrosion cracking (SCC) behavior of the Fe-Mn-Al-C-Ni low-density steels (LDSs) with different annealing times were studied in a simulated marine atmosphere, and the relation between them was discussed. The results indicated that the SCC mechanism of the LDSs was a combination of anodic dissolution and hydrogen embrittlement. This behavior was greatly facilitated by a micro-galvanic corrosion effect between B2 phase and austenite. The SCC resistance of the LDSs increased gradually as the annealing time extended, attributing to the transformation of B2 band to B2 particle, the decrease in the potential difference, and the homogenization of the strain distribution.
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