Research Progress on High Cycle Fatigue Performance ofSelective Laser Melting Formed Al-Si Alloy

Selective laser melting (SLM) has been one of the fastest growing additive manufacturing technologies in recent years, and is widely used in aerospace, automotive, medical and other fields. However, aluminum alloy powder has the characteristics of poor fluidity, high laser reflectivity and high thermal conductivity, resulting in rough surface of SLM forming parts and easy to form defects, which affects its fatigue properties. Based on the research status of high cycle fatigue performance of SLM Al-Si alloy at home and abroad, the influence of forming direction, forming parameters, heat treatment and surface treatment on high cycle fatigue performance and high cycle fatigue fracture mechanism are introduced, the methods of improving fatigue performance are summarized, and the research focus of SLM Al-Si alloy fatigue performance in future is prospected.