National Natural Science Foundation of China(51205073);China National Spark Program(2013GA780063);The science and technology project of Guangzhou city(2012J4100053,12C42011566);Foundation Project of The State Key Laboratory of Fluid Power Transmission and Control,Zhejiang University(GZKF-201201);Foundation Project of Traction Power State Key Laboratory,Southwest Jiaotong University(TPL1311);Foundation Project of the National Engineering Research Centre of Near-Net-Shape Forming for Metallic Materials,South China University of Technology(2012007)are also appreciated for supporting this work