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断口中的几何花样,文献报导中以在铝合金中的最多,在镍基合金,钼单晶和钢的白点中亦有发现。几何花样实为金属或合金在凝固过程中形成的结晶生长台阶。一般所报导的几何花样只有一个取向,而具有较完整晶体学取向特征的较为罕见。我们利用扫描电镜研究铸铁轧辊断口时发现,在白口铸铁和球墨铸铁的过渡区有一些疏松存在、其中有许多
Geometric patterns in the fracture, reported in the literature to the most in the aluminum alloy, nickel-based alloys, molybdenum single crystal and steel white spots have also been found. The geometric pattern is actually the crystalline growth step of the metal or alloy formed during solidification. Geometrical patterns reported generally have only one orientation, whereas features with more complete crystallographic orientation are less common. Using scanning electron microscopy to study the fracture of cast iron rolls, we found some looseness in the transitional areas of white cast iron and ductile iron, many of which