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。
The studies were carried out of the test of fatigue crack growth rate and relative to the microscopic morphology of fracture surface in certain high-strength steels.
对微细高速钢麻花钻破坏断口进行了显微观察和测量，根据微小孔钻削实验结果，分析了造成钻头折断的原因和影响其使用寿命的因素。
The fault plane of micro-drill is measured with microscope. According to the result of test, the main elements of destroying drill is investigated.
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