Fatigue Property of Nano-grained Delaminated Low-carbon Steel Sheet

• Published in: Journal of materials science & technology Vol. 27; no. 4; pp. 364 - 368
• Main Authors: Li, X., Jing, T.F., Lu, M.M., Xu, R., Liang, B.Y., Zhang, J.W.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-04-2011
• Subjects: Delaminated structure; Fatigue (materials); Fatigue failure; Low carbon steels; Nano-grained low-carbon steel; Nanocomposites; Nanomaterials; Nanostructure; Sheet metal; Steels; Tensile-tensile fatigue; Weak interface; 低碳钢板; 疲劳寿命; 疲劳性能; 疲劳裂纹扩展速率; 疲劳载荷; 纳米晶; 脱层; 透射电镜观察; Delaminated structure; Weak interface; Tensile-tensile fatigue; Nano-grained low-carbon steel
• ISSN: 1005-0302; 1941-1162
• DOI: 10.1016/S1005-0302(11)60075-3

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.