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利用萃取复型技术，对Ti－V－Nb微合金钢母材及模拟粗晶区中第二相粒子的形态、数量及成分进行了研究。结果表明，经热循环后，母材中形状不规则的第二相粒子变为方形，粒子的数量显著减少、尺寸增大、粒子的成分亦发生显著变化。分析表明，t8/5(800℃至500℃冷却时间)对粒子在热循环过程中的行为特点具有重要的影响，t8/5较小时，热循环过程中粒子发生溶解及长大；t8/5较大时，粒子不仅发生溶解及长大，在冷却过程中还会重新析出一些第二相粒子。
The morphology, amount and composition of the second phase particles in the Ti-V-Nb microalloyed steel base material and the simulated coarse grain zone were studied by using the extraction complex technique. The results show that after thermal cycling, the irregularly shaped second phase particles in the base material become square, the number of particles decreases significantly, the size increases and the composition of the particles also changes significantly. The analysis shows that the cooling rate of t8 / 5 (800 ℃ to 500 ℃) has an important effect on the behavior of particles during thermal cycling. When t8 / 5 is small, the particles dissolve and grow up during the thermal cycling. Larger particles not only dissolve and grow, but also precipitate some second-phase particles during the cooling process.