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和,其中微孔由微气孔和微缩孔组成,
形态和尺寸分
团簇
、锥
、粒
、积聚
、丝
和混合形
。