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0.70C-1.01Si-1.01Mn-11 ppm B Steel
Steel name: 0.70C-1.01Si-1.01Mn-11 ppm B
Diagram No.: 8897
Type of diagram: TTT
Chemical composition in weight %:
Steel A: 0.70% C, 1.01% Si, 1.01% Mn, 0.003% P, 0.001% S, 0.013% Ti
Steel B: 0.70% C, 1.01% Si, 1.01% Mn, 0.003% P, 0.001% S, 0.013% Ti, 11 ppm B, 34 ppm N
Steel group: Crabon steels with B
Note: Austenitizing temperature: 950 C, holding time: 180 sec. In high carbon steel, TTT nose temperature rises and upper baninte becomes easy to be formed with quantity of Si addition. Generation of upper bainite is reduced by boron addition. In this study, the influence
of boron addition on isothermal transformation behavior in Si-added high carbon steel was clarified.
By boron addition, lamellar spacing and growth rate of pearlite doesn’t change, but the nucleation of
pealite is reduced. But nucleation of pearlite is promoted when Fe23(C,B)6 precipitates. In the Si-added high
carbon steel, upper bainite is often formed with the generated ferrite on prior austenite grain boundary. It
is inferred that boron reduces ferrite generation in grain boundary which causes upper bainite formation.
It is confirmed that effective existence state of boron is grain boundary segregation.
Reference: Not shown in this demo version.
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