CCT-diagrams of Si-Mn-Mo bainitic steels have been determined.With Mo 0.25%,the high-temperature transformation of the steel shifts large to the right,and the bainitic trans- formation region becomes a“flat topped C-curve”at cooling rate in wide range.Si in the steel may cause shift of the bainitic transformation region towards the right,and of the pro-eutectoid ferritic transformation region towards the left.Mn may delay the high temper- ature transformation more violently than the bainitic transformation.
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