4.7 Article

Fatigue performance and crack propagation behavior of selective laser melted AlSi10Mg in 0?, 15?, 45? and 90? building directions

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.141141

关键词

Al-Si alloys; Additive manufacturing building direction; Fatigue test; Nanoindentation; Molten pool boundary

资金

  1. National Natural Science Foundation of China [11572170, 11872225]

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The study showed that SLM samples exhibited high fatigue performance in the 0° to 15° building directions, while lower in the 45° and 90° directions. Additionally, the fatigue fracture parameters indicated that the 0° and 15° samples outperformed the 45° and 90° samples. Moreover, the differences in elasticity modulus and hardness between the MPBs and molten pool cores influenced the crack propagation behavior.
In the present work, selective laser melted (SLM) AlSi10Mg samples were used in rotational bending fatigue, scanning electron microscope in-situ fatigue and nanoindentation tests. The effects of building directions (0?, 15?, 45? and 90?) and molten pool boundaries (MPBs) on the fatigue performance and crack propagation behavior of the AlSi10Mg samples were studied. The results indicated that the SLM samples (from 0? to 15? building directions) were in high fatigue performance range. The fatigue fracture parameters (fatigue strength, threshold stress intensity factor range and fracture toughness) of the 0? and 15? samples were higher than those of the 45? and 90? samples. Moreover, the differences of elasticity modulus and hardness between the MPBs and molten pool cores were identified. Under cyclic loads, the mechanical property differences resulted in the MPBs severe strain concentration and plastic deformation. By finite element simulations, the fatigue crack propagation behavior of the SLM samples can be explained. Finally, the crack aspect ratios (a/b) were measured from fracture surfaces. The building directions had no obvious impact on the ratio of a/b whose constant values (a > 300 ?m) were about 0.45?0.60.

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