Effect of Mo on the phase precipitation behavior of super austenitic stainless steel

The aging precipitation behavior of super austenitic stainless steels 904L (4.32% Mo), 254SMo (6.06% Mo), and AL-6XN (6.29% Mo) with different Mo contents at 800degree celsius-900degree celsius was investigated by scanning electron microscopy, X-ray diffraction, and transmission electron microscopy, and the effect of Mo content on the sigma-phase precipitation behavior of commonly used super austenitic stainless steels was explored. The effect of Mo content on the sigma-phase precipitation behavior of commonly used super austenitic stainless steel was investigated. The results show that the super austenitic stainless steels with different Mo contents formed different numbers and shapes of sigma-phases in the isothermal aging process, and the number of sigma-phases of 254SMo and AL-6XN is much larger than that of 904L, and the shape of the sigma-phases mainly shows coarse acicularity and elongation, while the sigma-phases of 904L show fine granularity.