1. School of Mechanical Engineering, Dalian Jiaotong University, Dalian, P. R. China
2. CCRC Changchun Railway vehicles Co., Ltd., Changchun, P. R. China
3. Technology Center, Maanshan Iron & Steel Co., Ltd., Maanshan, P. R. China
4. School of Material Science and Engineering, Dalian Jiaotong University, Dalian, P. R. China