借助疲劳试验机及SEM,研究了应力比对J55钢级疲劳裂纹扩展性能的影响,并对断口形貌进行分析.结果表明:随着应力比增大,进入快速裂纹扩展区的△K变小,对于应力比0.1,低Paris区断裂模式为沿晶体学平面发生的穿晶断裂,Paris线性部分为由双滑移机制控制的疲劳条带断裂,高Paris区为疲劳条带断裂和延性静态断裂相结合的断裂模式;应力比为0.3、0.5与应力比为0.1的断裂模式相似;对于应力比0.7,沿晶体学平面发生穿晶断裂模式贯穿整个Paris区.
The fatigue crack growth properties of the J55 steel were studied by means of SEM and the fatigue test e-quipment, and the fracture morphologies were analyzed. The results show that △K corresponding to the access of fast crack growth regime is reduced with increasing stress ratio; the fracture mode of lower Paris regime is trans-granular fracture occurring in crystallographic plane for stress ratio of 0.1, the fracture mode of the linear portion of Paris regime is fatigue striation fracture controlled double glide mechanism, and the fracture mode of the upper Paris regime is a combination of the fatigue striation fracture with the ductile-dimple static fracture; the every stage fracture mode of stress ratio of 0.3 and 0.5 is similar to that of stress ratio of 0.1; the transgranular fracture mode occurs at every stage of Paris regime for stress ratio of 0.7.
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