摘要
CP800等超高强钢材料已经在汽车扭力梁横梁上广泛使用,然而超高强钢在成形后塑性韧性急剧下降,同时产生较大的残余应力,对零件的疲劳性能产生不利影响。研究不同退火工艺对CP800材料性能的影响,以及退火工艺对扭力梁零件表面残余应力和疲劳性能的影响。研究表明在退火温度650℃,保温30 min下预变形CP800材料获得了最高的强韧性能,同时该退火工艺可以将零件表面残余应力降低至100 MPa以下,从而显著提高了零件的疲劳性能。
CP800 ultrahigh strength steel is widely applied to vehicle torsion beam. However, the ductility and toughness of steels decrease rapidly after forming. Meanwhile, the residual stress caused by forming is harmful to parts’ fatigue performance. The effect of annealing processes on properties of CP800 and torsion beam’s surface residual stress and fatigue lives are studied. The results show that CP800 steel has best strength and toughness when annealing at 650 ℃ for 30 min after 7% pre-deformation. In this annealing process, residual stress of parts’ surface decreased to less than 100 MPa, thus the fatigue lives of torsion beams are significantly increased.
作者
徐沛瑶
李素云
Xu Peiyao;Li Shuyun(Shanghai Huizhong Automotive Manufacturing Co.,Ltd.,Shanghai 200122;School of materials science and engineering,Shanghai University,Shanghai 200444)
出处
《传动技术》
2020年第1期44-48,共5页
Drive System Technique
关键词
去应力退火
残余应力
CP800
强韧化
扭力梁
stress relief annealing
residual stress
CP800
strengthening and toughening
torsion beam
