夹杂物诱发晶内铁素体形核的动力学模型  

Dynamics Model of Intra-Granular Ferrite Nucleation Induced by Inclusions

作　　者：朱立光[1] 吴耀光 张彩军[1] 阎少宏[3] 

机构地区：[1]河北联合大学冶金与能源学院,唐山063009 [2]河北钢铁集团石钢公司炼钢分厂,石家庄050031 [3]河北联合大学理学院,唐山063009

出　　处：《特殊钢》2014年第3期1-4,共4页Special Steel

基　　金：河北省自然科学基金(编号:E2013209207)

摘　　要：依据实验现象和非均质形核热力学机理,结合数学运算,建立了夹杂物诱发晶内铁素体形核的动力学模型。结果表明,基底相为顶角α的正三棱锥,形核相为球形的形核模型,基底相嵌入形核相的体积大,润湿角小,且顶角α存在最佳值约为34°时,形核最容易。通过0.45%C钢铸坯1 150℃10 min加热后以30℃/min冷却至500℃,再以100℃/min冷却至室温的试验表明,在钢中获得了大量的具有典型形状的氮化钛夹杂物,并诱发晶内铁素体形核,分割了奥氏体晶粒,细化组织。According to the experimental phenomena and thermodynamics mechanism of heterogeneous nucleation, combined with mathematic calculation, a dynamics model of intra-granular ferrite nucleation induced by inclusions has been established. Results show that in the nucleation model basal phase is a triangular pyramid with apex angle α; the nucleation phase is spherical nucleating model; as the volume of basal phase embedded nucleation phase is bigger with small wetting angle and there is a optimum value of apex angle or- about 34°, it is easiest to nucleate. The test of 0. 45% C steel casting billet with heating at 1 150 ℃ for 10 min then cooling to 500 ℃ by 30 ℃/min rate and cooling to ambient by 100 ℃/min rate show that a lot of titanium nitride inclusions are got in steel to induce intra-granular ferrite nucleation, cut off austenite grain and fine structure.

关 键 词：夹杂物 晶内铁素体 诱发形核 动力学 模型 

分 类 号：TG142.1[一般工业技术—材料科学与工程]