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6.4 贝氏体形成的反应动力学在碳钢中,很难将贝氏体和铁素体以及珠光体反应区分开,因为这些相在贝氏体转变条件下同样可以形成。例如,对于0.8碳钢的TTT图是一个连续转变曲线,虽然珠光体和贝氏体转变都可以发生,但是要明晰地辨清这两种转变而去研究它们的动力学是困难的。然而,添加合金元素可以将反应分开到一定程度,使珠光体和贝氏体反应在TTT图上变成分开的两条曲线,而比熟识的C曲线具有更复杂的图形。图6.4是3％铬,0.5碳钢的TTT
Reaction kinetics of bainite formation In carbon steel, it is difficult to distinguish between bainite and ferrite and pearlite reactions because these phases can also be formed under bainite transformation conditions. For example, the TTT plot for 0.8 carbon steels is a continuous transition curve, and while both pearlite and bainite transformation can occur, it is difficult to understand both of these transitions to study their kinetics. However, the addition of alloying elements separates the reaction to a degree that renders the pearlite and bainite reactions into separate two curves on the TTT plot, with more complex patterns than the familiar C curve. Figure 6.4 is TTT for 3% chromium, 0.5 carbon steel