中文摘要：

在不同疲劳下面的低碳的钢表装载的 nano 颗粒的 delaminated 上的紧张紧张疲劳生活测试被执行学习钢的疲劳性质。钢的三维的微观结构被 TEM 观察。另外，在不同负担下面的标本的疲劳破裂的形态学被 SEM 观察。结果在低压力的条件下面在 nano 颗粒的钢的弱接口上显示出那种微裂缝的形式，它妨碍主要裂缝的繁殖并且减少疲劳裂缝繁殖率，导致钢的延长疲劳生活。

英文摘要：

Tension-tension fatigue life tests on nano-grained delaminated low-carbon steel sheet under different fatigue loads are carried out to study the fatigue properties of the steel. The three-dimensional microstructures of the steel are observed by TEM. In addition, the morphology of the fatigue fracture of the specimen under different loads is observed by SEM. The results show that micro-cracks form on the weak interface of the nano-grained steel under low-stress conditions, which hinders the propagation of the main cracks and reduces the fatigue crack propagation rate, resulting in the extending fatigue life of the steel.