A numerical study of stress distribution and fatigue behavior in terms of the effect of voids adjacent to inclusions was conducted with finite element modeling simulations under different assumptions. Fatigue mechanisms were also analyzed accordingly. The results showed that the effects of inclusions on fatigue life will distinctly decrease if the mechanical properties are close to those of the steel matrix. For the inclusions, which are tightly bonded with the steel matrix, when the Young’s modulus is larger than that of the steel matrix, the stress will concentrate inside the inclusion; otherwise, the stress will concentrate in the steel matrix. If voids exist on the interface between inclusions and the steel matrix, their effects on the fatigue process differ with their positions relative to the inclusions. The void on one side of an inclusion perpendicular to the fatigue loading direction will aggravate the effect of inclusions on fatigue behavior and lead to a sharp stress concentration. The void on the top of inclusion along the fatigue loading direction will accelerate the debonding between the inclusion and steel matrix.

在不同的假设条件下，通过有限元建模模拟对应力分布和疲劳行为进行了数值研究，该结果涉及与夹杂物相邻的空隙的影响。疲劳机理也作了相应分析。结果表明，如果机械性能接近钢基体，则夹杂物对疲劳寿命的影响将明显降低。对于与钢基体紧密结合的夹杂物，当杨氏模量大于钢基体的杨氏模量时，应力将集中在夹杂物内部。否则，应力将集中在钢基质中。如果在夹杂物和钢基体之间的界面上存在空隙，则它们对疲劳过程的影响会因其相对于夹杂物的位置而异。垂直于疲劳载荷方向的夹杂物一侧的空隙会加剧夹杂物对疲劳行为的影响，并导致尖锐的应力集中。夹杂物顶部沿疲劳载荷方向的空隙将加速夹杂物与钢基体之间的剥离。