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

作　　者：X. Li T.F. Jing M.M. Lu R. Xu B.Y. Liang J.W. Zhang 

机构地区：[1]College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China [2]School of Electronics and Information Engineering, Liaoning Technical University, Huludao 125105. China [3]State Key Laboratory of Metastable Materials Science & Technology, Yanshan University, Qinhuangdao 066004, China [4]Materials & Chemical Engineering School, Zhongyuan University of Technology, Zhengzhou 450007, China

出　　处：《Journal of Materials Science & Technology》2011年第4期364-368,共5页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China under grant No. 50371073

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.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.

关 键 词：Nano-grained low-carbon steel Delaminated structure Tensile-tensile fatigue Weak interface 

分 类 号：TG146.21[一般工业技术—材料科学与工程] U463.820.6[金属学及工艺—金属材料]