Bainitic Steel

Steel name: Bainitic steel
Diagram No.: 6033
Type of diagram: TTT
Chemical composition in weight %:
Cr-free steel: 0.218% C, 1.831% Si, 2.021% Mn, <0.006% P, <0.003% S, 0.227% Mo, <0.003% N
Cr-added steel: 0.221% C, 1.792% Si, 1.983% Mn, <0.003% P, <0.003% S, 1.002% Cr, 0.229% Mo, <0.003% N
Steel group: Bainitic steels
Note: Calculated diagram. During austempering treatment, the specimens were heated to 1000 C to obtain full austenite structure, followed by fast cooling to the isothermal bainitic transformation temperatures (400 C, 430 C, and 450 C) at 30 C/s. The bainite start temperature (BS) and martensite start temperature (MS) for Cr-free steel are calculated to be 524 C and 376 C.
Figure: (a) The dilatation versus time during the isothermal holding at 400°C, 430°C, and 450°C the two steels; (b) Calculated time-temperature-transformation (TTT) curves of the Cr-free and Cr added steels showing the start of transformations from austenite A to ferrite F and from austenite to nainite B. It shows that the kinetics of bainitic transformation are hindered by Cr addition.
Reference: Not shown in this demo version.

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