基于Fe-C合金的微观组织结构,建立了碳钢线性热膨胀系数计算模型,计算出不同碳含量的钢种在不同温度下的瞬时线性热膨胀系数,并将计算值应用于铸坯热-弹-塑性应力模型,研究了包晶相变对连铸坯初生坯壳凝固收缩的影响.模拟结果表明:浇铸碳含量在0.1 %附近的包晶钢时,初生坯壳在靠近弯月面区域和角部区域的收缩很不规则,容易诱发表面缺陷.
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