正三棱锥形夹杂物诱导晶内铁素体形核模型研究

发布时间：2018-02-04 17:47

  本文关键词： 晶内铁素体 球形夹杂物 形核模型 正三棱锥形　出处：《材料工程》2017年07期 　论文类型：期刊论文

【摘要】：通过建立晶内铁素体形核模型,结合数学推导发现,基底相为不规则形状的夹杂物比基底相为球形夹杂物形核功小,易诱导铁素体形核。根据数学模型分析球形夹杂物诱导晶内铁素体形核的影响因素。结果表明:夹杂物尺寸过小时不利于诱导晶内铁素体形核,其尺寸增加到0.15μm后,对铁素体的形核影响反而不大;夹杂物与钢液的润湿角越小,越易诱导铁素体形核;夹杂物与钢液的润湿角为70°~90°时,球形夹杂物易诱导正三棱锥形铁素体析出,而润湿角小于70°时,易诱导球形铁素体析出;析出相为正三棱锥形铁素体形核模型的形核率比析出相为球形铁素体模型的形核率高。通过实验验证了不规则夹杂物可以诱导铁素体形核,且夹杂物尺寸大于0.15μm后,对铁素体的形核影响不大。
[Abstract]:By establishing the model of ferrite nucleation in crystal and combining with mathematical derivation, it is found that the inclusion with irregular base phase is less than that with spherical inclusion with substrate phase. It is easy to induce ferrite nucleation. According to the mathematical model, the influence factors of intracrystalline ferrite nucleation induced by spherical inclusions are analyzed. The results show that the inclusion size is too small to induce intracrystalline ferrite nucleation. When the size of ferrite was increased to 0.15 渭 m, the nucleation of ferrite was not affected. The smaller the wetting angle between inclusions and molten steel is, the easier it is to induce ferrite nucleation. When the wetting angle between inclusions and molten steel is 70 掳~ 90 掳, spherical inclusions are apt to induce the precipitation of normal triangular pyramidal ferrite, while when the wetting angle is less than 70 掳, spherical ferrite precipitates easily. The nucleation rate of the precipitated phase is higher than that of the spherical ferrite model. The experimental results show that irregular inclusions can induce the nucleation of ferrite. When the size of inclusions is greater than 0.15 渭 m, the nucleation of ferrite has little effect.
【作者单位】： 华北理工大学冶金与能源学院;
【基金】：国家自然科学基金资助项目(51474089)
【分类号】：TG142.1
【正文快照】： 晶内铁素体(Intra-Granular　Ferrite,IGF)最早发现于低碳微合金化高强度钢的焊接组织中,其形核主要是由一定尺寸的夹杂物诱导产生的。晶内铁素体的产生改善了组织,细化了晶粒,提高了钢的强韧性和抗断裂性,其研究和应用对象主要是低碳微合金焊接钢和管线钢[1,2]。近年来,人们，

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