积聚物

The pattern of fracture by impact penetration test and tensile fatigue test of thermite welding with stereoscan was observed,and the component of defect with energy spectrum was analyed.

微观缺陷主要包括微孔杂,其中微孔由微气孔微缩孔组成,杂物按形态分团杂、锥杂、粒杂、积聚物杂、丝杂混合形杂。