对NbC在含Nb(0.24,0.15和0.08％)的三种微合金化钢的铁素体中的沉淀和沉淀强化作用进行了研究,利用已有理论估算了NbC在铁素体中沉淀的临界核心尺寸、均匀形核率、最大形核率温度,大约在600℃等温沉淀可得到最为有效的沉淀强化效果。此外,修正了NbC粒子沉淀强化屈服强度增量公式,试验结果与公式计算符合较好。结果指出,当NbC粒子尺寸小到2.6nm时,沉淀强化机制仍为Orowan绕越机制。
The precipitation of NbC in ferrite and its effect on the precipitation-strengthening of the microalloy steels containing 3 different percentages of Nb, i.e. 0.24, 0.15 and 0.08％, have been studied. The critical NbC nucleus size, the rate of homogeneous nucleation, the temperature of the maximum rate of homogeneous nucleation and the time for complete precipitation were estimated in agreement between the calculated and experimental results. The precipitation-strengtheningseems to have optimum effect on the steels by isothermal precipitation for 1 h at about 600℃. Moreover, an improvement of the formula for the yield strength increment by the platelike NbC precipitates was also made. It is shown that, even the size of NbC precipitates down to 2.6nm, the mechanism of the precipitation-strengthening is still that of the Orowan's.
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