Abstract
In order to investigate the σ phase formation in a series of 25 Cr-20 Ni steels, the effect of prestrain up to 20% by tension on the σ phase formation at 800°C was studied for low carbon 25 Cr-20 Ni steel with and without an approximately 3% addition of Mo or Si.The results obtained are as follows:(1) The effect of prestrain on the σ phase formation was observed in all of the three specimens and the σ phase was formed in the early stages of heating in the prestrained specimens.(2) The morphology of the σ phase thus formed was not the widmanstätten type, but the σ phase existed along the annealing twin boundaries and its amount, slightly increased with increasing prestrain.(3) In the strongly prestrained specimens, the σ phase formation also occurred on the slip bands in the vicinity of grain boundaries.(4) In the undeformed specimens with Si and Mo, there were denuded zones where the σ phase formation was hardly observable.(5) It seems probable that the σ phase formation in the prestrained specimen is enhanced by the deformation-induced crystal defects, while that in the undeformed specimens depends on the point defect concentration.
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