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测定了ZG42CrMo无缺陷Y型试块试样与含缩孔缩松区的L型模拟试块缩孔周围缩松区试样疲劳裂纹扩展速率.对试样进行了裂纹追踪观察,揭示了缩松区疲劳裂纹超前延伸、接替扩展、彼此连接的扩展特征.用能量观点阐明了缩松区延缓疲劳裂纹扩展的物理本质.
The fatigue crack growth rate of the specimens around the shrinkage cavity in the ZG42CrMo defect-free Y-shaped specimen and the L-shaped simulated specimen with shrinkage shrinkage zone was measured. The crack-tracking observation of the specimen revealed that the shrinkage The fatigue cracks in the area extend ahead of each other and take over the extended and interconnected extended features.The physical essence of retarding the fatigue crack growth in the shrinkage zone is clarified from the viewpoint of energy.