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采用TEM和EDX技术,研究了低碳微合金钢中Nb,V,Ti的碳氮化物在不同温度保温后的回溶行为．结果表明,Nb-V-Ti微合金钢中存在尺寸明显不同的两类析出,较大的析出颗粒平均尺寸在80nm以上,其心部为(Nb,V,Ti) (C,N),而边部为(Nb,Ti)(C,N),较小的析出颗粒平均尺寸在20nm以下,其类型为(Nb,Ti)(C,N)．两类析出物中Nb/Ti原子比均随回溶温度的升高而减小．V-Ti微合金钢中,Ti的存在对V的回溶具有拖曳作用,提高了V的碳氮化物的热稳定性．Nb-V-Ti微合金钢中,由于Nb,V,Ti之间综合作用,使得析出相中V具有更高的热稳定性．
The TEM and EDX techniques were used to study the solution behavior of Nb, V, Ti carbonitride in low carbon microalloyed steel after heat preservation at different temperatures. The results show that there are two kinds of precipitates with different sizes in the Nb-V-Ti microalloyed steel. The larger size of the precipitated particles is above 80nm with the core of (Nb, V, Ti) (C, N) The edge is (Nb, Ti) (C, N). The smaller precipitates have an average size below 20 nm and are of the type (Nb, Ti) (C, N). Both types of precipitates Nb / Ti atomic ratio decreases with increasing the temperature of the solution. In the V-Ti microalloyed steel, the presence of Ti has a drag effect on the back-dissolving of V and improves the thermal stability of the carbonitride of V. Nb-V-Ti microalloyed steel, due to the combined effect of Nb, V, Ti, making the precipitated phase V has a higher thermal stability.