The primary phase grain size is a key parameter to understand the formation of the macrosegregation pattern in large steel ingots. Most of the characterization techniques use two-dimensional measurements. In this paper, a characterization method has been developed for equiaxed dendritic grains in industrial steel castings. A total of 383 contours were drawn two-dimensionally on twelve 6.6 cm2slices. A three-dimensional reconstruction method is performed to obtain 171 three-dimensional grains. Data regarding the size, shape and orientation of equiaxed grains is presented and thereby shows that equiaxed grains are centimeter-scale complex objects. They appear to be a poly-dispersed collection of non-isotropic objects possessing preferential orientations. In addition, the volumetric grain number density is 2.2 × 107 grains/m3, which compares to the 0.5 × 107 grains/m3 that can be obtained with estimation from 2D measurements. The 2.2 × 107 grains/m3 value is ten-times smaller than that previously used in the literature to simulate the macrosegregation profile in the same 6.2 ton ingot.
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机译:初级相的晶粒尺寸是了解大型钢锭中宏观偏析模式形成的关键参数。大多数表征技术使用二维测量。在本文中,已经开发了表征工业钢铸件中等轴枝晶晶粒的表征方法。在十二个6.6 cm 2 sup>切片上二维地绘制了总共383个轮廓。执行三维重建方法以获得171个三维晶粒。给出了有关等轴晶粒尺寸,形状和取向的数据,从而表明等轴晶粒是厘米级的复杂物体。它们似乎是具有优先取向的非各向同性物体的多分散集合。此外,体积晶粒数密度为2.2×10 7 sup>颗粒/ m 3 sup>,而0.5×10 7 sup>颗粒/ m 3 sup>可以通过2D测量估算得出。 2.2×10 7 sup>晶粒/ m 3 sup>值比先前文献中模拟相同6.2吨铸锭中宏观偏析轮廓所使用的值小十倍。
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