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

X.Li 1,2),T.F.Jing 1,3),M.M.Lu 1),R.Xu 1,3),B.Y.Liang 4) and J.W.Zhang 1) 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

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.

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