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本文研究了螺纹滚压强化对300M钢螺纹疲劳寿命的影响,并利用X射线应力分析仪、扫描电镜(SEM)及透射电镜(TEM)分析了其强化机制。研究结果表明:螺纹滚压强化的结果使疲劳强度极限从σ_(0.1)=250MPa提高到σ_(0.1)=448MPa;强化层内存在很高的宏观残余压应力、强化层的位错密度增加及表面粗糙区的降低是提高疲劳强度的主要因素。
In this paper, the effects of thread rolling on the fatigue life of 300M steel were studied. The strengthening mechanism was analyzed by X-ray stress analyzer, scanning electron microscope (SEM) and transmission electron microscope (TEM). The results show that as a result of the thread rolling strengthening, the fatigue strength limit is increased from σ_ (0.1) = 250MPa to σ_ (0.1) = 448MPa. There exists high macroscopic residual compressive stress in the strengthening layer and an increase in the dislocation density of the strengthening layer The reduction of the rough surface area is the main factor to improve the fatigue strength.