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本文用宏观和微观方法测量了几种高强度钢的疲劳裂纹扩展速率,用金相和断口复型法观察了疲劳断口的微观形态以及与显微组织的关系。结果表明,宏观与微观测量的结果基本一致;疲劳裂纹扩展速率随平均应力的增加而增加;18CrMn2MoBA钢显微组织中的颗粒相(M+A)可以降低疲劳裂纹扩展速率。
In this paper, the fatigue crack growth rate of several kinds of high-strength steels was measured by macroscopic and microscopic methods. The microstructure of the fatigue fracture and its relationship with the microstructure were observed by metallographic and fracture-surface complex method. The results show that the macroscopic and microscopic measurements are basically the same. The fatigue crack growth rate increases with the increase of average stress. The grain phase (M + A) in 18CrMn2MoBA steel can reduce the fatigue crack growth rate.