The results show that the life of fatigue is increased remarkably,the period of crack initiation is delayed and the propagation rate of crack is decreased after RE N C B diffusion of the steel.

• 结果表明 ,稀土氮碳硼共渗处理后 ,4 5钢疲劳寿命显著提高 ,裂纹形成延迟 ,裂纹扩展速度降低。