Fatigue Behaviour of a 400 MPa Grade Nb Microalloyed Steel
LIU Bingyu1，2,YU Jingyuan2,LI Baomian1,CUI Jianzhong1
1. Key Laboratory of Education Ministry for Electromagnetic Processing of Materials, Northeastern University, Shenyang 110004， Liaoning, China；2. College of Materials and Chemical Engineering, Liaoning University of Technology, Jinzhou 121001， Liaoning, China
Abstract：Flexural behavior of Nb microalloyed steel SQ390 with stress ratio of -0.82 and -1 were investigated by using fourpoint flexural fatigue experiments. Fracture morphology was observed with SEM and Soderberg formula was demonstrated by experimental results. The results show that flexural fatigue curves of the SQ390 steels presented linear. Flexural fatigue at different stress ratio were 275 and 256 MPa, respectively. Flexural cracks lied at the surface of the SQ390 steels. Soderberg formula was well applicable to the results of fourpoint flexural fatigue experiments of microalloyed steel.
刘秉余;于景媛;李宝绵;崔建忠. 一种400 MPa级铌微合金钢的疲劳性能[J]. 钢铁, 2009, 44(8): 85-0.
LIU Bingyu;YU Jingyuan;LI Baomian;CUI Jianzhong. Fatigue Behaviour of a 400 MPa Grade Nb Microalloyed Steel. Iron and Steel, 2009, 44(8): 85-0.
2009, Vol. 44 
