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提出了一种关于钢的B_0(理论上限温度)与B_S(实际上限温度)物理含义的新解释。发现钢中贝氏体反应的B_0温度应该定义为奥氏体向铁素体共格生长转变的热力学平衡曲线Z_(γ→α)与奥氏体向渗碳体转变的热力学曲线(Fe-G相图上的ES曲线)的交点,贝氏体反应的B_S温度比B_0温度大约低50～55℃。用这种方法得到普碳钢的B_S和B_0温度分别为630℃和680℃。还讨论了钢的化学成分对B_S温度的影响。许多商品钢的B_S温度可以通常用公式B_S(℃)=630-45Mn-40V-35Si-30Cr-25Mo-20Ni-15W来预测。
A new explanation of the physical meaning of B_0 (theoretical maximum temperature) and B_S (actual maximum temperature) of steel was proposed. It is found that the B_0 temperature of bainite in steel should be defined as the thermodynamic curve of thermodynamic equilibrium curve Z_ (γ → α) and austenite to cementite transition from austenite to ferrite co-growth (Fe-G ES curve on the phase diagram), the B_S temperature of the bainite reaction is about 50 to 55 ° C lower than the B_0 temperature. The B_S and B_0 temperatures obtained by this method were 630 ℃ and 680 ℃, respectively. The effect of the chemical composition of steel on the B_S temperature is also discussed. The B_S temperature for many commercial steels can generally be predicted using the formula B_S (° C) = 630-45Mn-40V-35Si-30Cr-25Mo-20Ni-15W.