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本文研究了38CrMoAlA和30CrMnSiA两种钢中所含夹杂物对疲劳性能的影响。研究结果表明:在夹杂物含量基本相同的条件下,夹杂物的大小、形状及分布特徵对疲劳寿命具有明显的影响。夹杂物的颗粒大小直接支配着裂纹的成核与扩展,当夹杂物的平均直径大于40μm时,由夹杂物引起疲劳失效的比率可达95％以上。因此,在控制夹杂物含量的基础上,通过减小夹杂物颗粒尺寸和改变不利的几何形状及分布,可减缓夹杂物对疲劳性能的有害影响。
In this paper, the effects of inclusions on the fatigue properties of 38CrMoAlA and 30CrMnSiA steels were studied. The results show that the size, shape and distribution of inclusions have significant influence on the fatigue life under the condition of the same inclusion content. The particle size of inclusions directly dominates the nucleation and propagation of cracks. When the average diameter of inclusions is larger than 40 μm, the fatigue failure rate caused by inclusions can reach more than 95%. Therefore, on the basis of controlling the content of inclusions, the deleterious effects of the inclusions on the fatigue properties can be slowed down by reducing the size of the inclusions and changing the unfavorable geometry and distribution.