日本一研究小组试制成功直径 1μｍ以下超微细晶粒组织的厚钢板 ,其屈服强度为传统 2倍以上。试制板厚 18ｍｍ ,长 2ｍ ,重约 2 0ｋｇ。屈服强度是给材料施加力时材料开始永久变形(塑性变形 )的强度。它为构件设计时用的指标 ,此次成功地从传统的 35ｋｇ强度提高到 80ｋｇ。另 A research team in Japan successfully developed a plate of ultra-fine grain with a diameter of 1μm or less, whose yield strength was more than twice that of the conventional one. Trial plate thickness 18mm, length 2m, weighing about 20kg. Yield strength is the strength at which the material begins to permanently deform (plastically deform) when a force is applied to the material. It is an indicator of the design time of the component, which has been successfully increased from the traditional 35kg strength to 80kg. another