用恒变形速率拉伸试验方法研究了铁素体奥氏体双相不锈钢焊缝金属的断裂行为.发现裂纹起源与焊缝中氧比物夹杂有关,氢的存在影响裂纹起源点的位置；裂纹的扩展是一个非连续过程，不同阶段的断口形貌不同：γ相阻碍裂纹的扩展,δ相晶粒内的γ片常形成撕裂棱，δ晶粒间的γ相中常形成韧窝:当氢含量、氮含量提高时，易于形成穿晶解理断口。
The fracture behaviour of weld metal of ferrite-austenite duplex stainless steel was investigated by constant deformation rate tensile test. It is shown that the origin of cracking relates with hydrogen and oxide inclusions in the weld metal. The propagation of cracks is a discontinuous process, the fracture appearance is different in each stage. The γ-phase resists the advance of cracks, and γ sheet within δ grains often forms tearing ridge, the γ-phase between δ grains often forms dimples. Transgranular cleavage fracture is more easily formed in the weld metal with higher hydrogen and nitrogen content.
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