超级钢的主要特征是高洁净度和超细晶粒组织，在不增加任何合金元素的情况下，其强度、韧性和使用寿命提高一倍。
Ultra steel is characterized by its higher cleanness and ultra-fine grain, thus it has higher strength, toughness and longer life even without addition of more alloying elements.
研究发现，AZ91镁合金经过一个道次的等通道角挤压后，材料中就有大量的超细晶粒出现。
It was found that a great deal of ultra-fine grains appear in AZ91 just after one pass of ECAP.
有关研究表明在超细硬质合金中添加抑制剂可以有效地控制硬质合金中晶粒的长大。
Relational researches prove that appended inhibitors can prevent the growing of crystals in ultra fine cemented carbides effectively.
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