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首页> 外文期刊>Ironmaking & Steelmaking >Elucidation of inclusion distribution mechanism in continuously cast AISI 316L stainless steel blooms
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Elucidation of inclusion distribution mechanism in continuously cast AISI 316L stainless steel blooms

机译：阐明AISI 316L不锈钢连铸坯中夹杂物的分布机理

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摘要

A study was conducted to ascertain the mechanism of modification of the inclusion distribution along the cross-section of continuously cast AISI 316L grade stainless steel blooms. Specimens from various locations along the perpendicular and diagonal directions of 160 mm square AISI 316L grade stainless steel blooms were used. The inclusion distribution on the surface of the specimens was studied by the feature counting method using an optical microscope. Size distribution, mean size, mean distance of separation, and volume fraction of inclusions were investigated by measuring the sizes of inclusions using an image analyser and using the particle size distribution module of a computer program developed at Mukand Ltd which was based on the Schwartz-Saltykov method. The inclusion size was found to be finer near the surface of the bloom compared with that observed further away from the surface towards the center where the shell growth rate was lower than that at the surface. The number of inclusions per unit area was found to increase to a maximum value and then decrease from the surface to the center of the bloom cross-section. Particle coarsening diffusional growth of larger silica inclusions at the expense of smaller ones is found to be operative during solidification. The coarsening rate constant matches fairly well that derived from the physical parameters of the melt and the inclusions. Inclusions were characterised by scanning electron microscopy and energy dispersive X-ray spectroscopy.
机译：为了确定沿连续铸造AISI 316L级不锈钢大方坯横截面的夹杂物分布变化的机理，进行了研究。使用了沿160毫米见方的AISI 316L级不锈钢大方坯的垂直和对角线方向上不同位置的样品。使用光学显微镜通过特征计数法研究了样品表面上的夹杂物分布。尺寸分布，平均尺寸，平均分离距离和夹杂物的体积分数是通过使用图像分析仪并使用Mukand Ltd开发的计算机程序的粒度分布模块（基于Schwartz- Saltykov方法。发现与大块表面附近的夹杂物尺寸相比，从表面到中心的壳生长速率低于表面的中心处观察到的夹杂物尺寸更细。发现每单位面积的夹杂物数量增加至最大值，然后从表面至大面积横截面的中心减少。发现在固化过程中，以较小的夹杂物为代价的较大的二氧化硅夹杂物的颗粒粗化扩散生长是可行的。粗化速率常数与由熔体和夹杂物的物理参数得出的常数匹配得很好。通过扫描电子显微镜和能量色散X射线光谱对夹杂物进行表征。

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