The fracture surface of 1Cr18Ni9Ti steel welded joint exhibits hybrid tough fracture of dimple and tear ridge,and dimple becomes tiny and uniform with the temperature decreasing.

• 拉伸试样断口形貌分析结果显示,1Cr18Ni9Ti钢焊接接头的拉伸试样断口均为韧窝和撕裂棱混合型韧性断口,韧窝随温度的降低而变得细小、均匀。