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利用萃取复型分析技术 ,对Ti V Nb微合金管线钢中第二相粒子进行了研究。结果表明 ,钢中存在大量弥散分布的细小粒子 ,尺寸较大的粒子近似方形 ,含Ti量较高而含Nb量较低 ;尺寸较小的粒子形状不规则 ,含Ti量较低、含Nb量较高 ;尺寸在 2 0nm以上的粒子中含V量均较低。电子衍射分析表明 ,粒子具有面心立方结构。这些弥散分布的粒子能够显著阻止奥氏体晶粒长大 ,在 1 1 50℃以下加热时 ,该钢的奥氏体晶粒长大速度非常小 ,而在1 1 50℃以上的温度加热时 ,奥氏体晶粒长大较明显。
The second phase particles in Ti V Nb microalloyed pipeline steel were studied by extraction complex analysis. The results show that there are a large number of fine particles dispersed in the steel, the size of the larger particles approximate square, containing a higher amount of Ti and lower Nb content; smaller size particles irregular shape, containing a lower Ti content, containing Nb The higher the content, the smaller the content of V in the particles with the size of more than 20 nm. Electron diffraction analysis shows that the particles have a face-centered cubic structure. These dispersed particles can significantly prevent the austenite grain growth, when heated below 1150 ℃, austenite grain growth rate of the steel is very small, and at a temperature above 115 ℃ , Austenite grain growth more obvious.