论文部分内容阅读
通过热力学计算、光学显微镜、扫描电子显微镜和透射电子显微镜观测及微观成分分析证明：ＲＥ（Ｃｅ）可加剧奥氏体中锰钢凝固时的成分过冷现象，促进树枝晶的发展、熔断、游离和增殖，提高结晶形核率，有效地细化奥氏体晶粒；Ｔｉ和Ｃ可以直接在液相中反应形成ＴｉＣ，并可作为渗碳体的结晶核心，使一次渗碳体和共晶渗碳体发生粒化和细化，从而避免连续网状碳化物的形成。
Thermodynamic calculations, optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) and microscopic compositional analysis show that RE (Ce) can exacerbate the overcooling of manganese steel during austenite solidification and promote the development of dendrites. And proliferation, increase the nucleation rate of the crystal and refine the austenite grains effectively. Ti and C can react directly in the liquid phase to form TiC, and can be used as the crystal nucleus of the cementite, so that the primary cementite and the eutectic Cementite is grained and refined, thereby avoiding the formation of a continuous network of carbides.