在金属材料中自点是一种破坏力极强的扩展性缺陷,一般说来是不容许存在的。而分散性的非金属夹杂物是钢中常有的缺陷,在零件中容许存在一定数量。由于白点是一种破坏力极强的扩展性缺陷,从机械性能试验得出:白点对零件的抗张强度和比例极限的影响很大,而对延伸率、断面收缩率以及冲击韧性的降 In metal materials from the point of view is a destructive scalability defects, in general, is not allowed to exist. Dispersive non-metallic inclusions are common defects in steel, allowing for the presence of a certain amount in parts. As the white point is a very destructive scalability defects, from the mechanical properties of the test: White spots on the part of the tensile strength and the proportion of the limit of great impact on the elongation, reduction of area and impact toughness drop