呈富集状态
In enriched state
以上为机器翻译结果，长、整句建议使用 人工翻译 。
实验结果表明，镁在球墨铸铁件表面大量富集，在整个横截面上由外到内呈梯度分布状态。
Experimental result shows that the surface of ductile iron casting has a large amount of magnesium, and, there is a gradient distribution of magnesium from external to internal in the cross section.
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