利用Confocal激光扫描显微镜原位观察了AISI304不锈钢熔化过程中夹杂物在固-液(S-L)糊状区内的漂移与聚集行为.结果显示,夹杂(SiO2-Al2O3-CaO-MgO复合氧化物)在未熔高温铁素体(δ)相间的液相通道中漂移,未熔δ相体积分数为70%时,夹杂的平均漂移速率为80 μm/s;近完全熔化时,远离S-L界面的夹杂漂移速率高达1500 μm/s,而S-L界面附近的夹杂速率在50-200 μm/s之间;随着熔化的进行,未熔δ相表面逐渐凹凸不平,出现"类亚晶界".δ相对其附近漂移的夹杂表现出较强的吸附作用;夹杂多在δ-L界面处聚集、自球化;δ相吸附提供了夹杂去除的潜在途径.分析了夹杂运动的动力学机制.
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