The high-cycle and very-high-cycle fatigue (VHCF) behaviors of AlSi10Mg alloy produced by additive manufacturing (AM) were studied. A crystal plasticity finite element model (CPFEM) with Voronoi tessellation was developed to simulate the cyclic plastic deformation considering defect effects. Morrow’s model and Smith-Watson-Topper (SWT) model were used to predict the fatigue life and the SWT model was in good agreement with the experimental life between 10⁵ and 10⁹. CPFEM simulation indicated that the accumulated cyclic plastic strain is significantly increased near a pore than that of an inclusion. The residual stress near an inclusion led to large plastic strain localization, which is harmful to fatigue performance.

研究了通过增材制造（AM）生产的AlSi10Mg合金的高循环和超高循环疲劳（VHCF）行为。建立了具有Voronoi镶嵌的晶体塑性有限元模型（CPFEM），以模拟考虑缺陷影响的循环塑性变形。使用Morrow模型和Smith-Watson-Topper（SWT）模型来预测疲劳寿命，并且该SWT模型与10 ⁵和10 ⁹之间的实验寿命非常吻合。CPFEM模拟表明，孔附近的累积循环塑性应变比夹杂物明显增加。夹杂物附近的残余应力导致较大的塑性应变局部化，这对疲劳性能有害。