Abstract
A metallographic study of isothermal-transformation products formed at various temperatures was made in 2%Si-1%Mn-0.34%C and 2%Si-1%Mn-0.59%C steels with particular emphasis on the formation mechanism of bainitic ferrite. In the 0.34%C steel, the austenite first decomposes into ferrite and then into pearlite in the later stage of transformation at 973 K (just below the A 1 temperature). As decreasing the decomposition temperature, the amount of proeutectoid ferrite decreases and the structure becomes fully pearlitic at 873 K
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