The strength and toughness of super fine grain steels are greatly increased because of its micrometer or sub micrometer grade grain size.
超细晶粒钢依靠生成微米级或亚微米级的铁素体，使钢的强度和韧性大大提高。
The grain size grade is about 4-5 class, and that during the thickness the central is less half a class than the lateral.
薄板坯的晶粒度的大致范围在4～5级，其中在厚度方向上薄板坯中心部位晶粒度比侧部小半个等级。
In this paper, the chemical contents, microstructure, inclusion, grain size and fracture analysis of the second grade gas turbine blade were investigated.
对燃气轮机二级动叶片失效件进行了化学成分分析、金相组织观察、晶粒度测定、夹杂物检查及断口分析。
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