ABSTRACT

This paper focuses on the effect of melting modes on microstructural evolution and tribological properties of AlSi10Mg alloy fabricated by selective laser melting (SLM). The results showed that the microstructures of SLM AlSi10Mg consisted of primary α-Al surrounded by cellular Si networks (∼500 nm) when fabricated in conduction mode, but has a finer cellular-like Si phase (∼200 nm) when fabricated in keyhole mode. The strong convection caused by the melt reflow and Marangoni convection under keyhole mode also resulted in deposition of nano-scale Si particles at the bottom of the molten pool. The SLM AlSi10Mg fabricated in keyhole mode exhibited better wear resistance than that fabricated in conduction mode. Compared to traditional as-cast specimens, both SLM specimens showed better wear resistance due to the unique cellular-like networks. The SLM technique offers a new approach for material processing that can be used to refine microstructures for improved tribological properties.

摘要

本文重点研究了熔化方式对通过选择性激光熔化（SLM）制备的AlSi10Mg合金的组织演变和摩擦学性能的影响。结果表明，SLM AlSi10Mg的微观结构由初生α-Al组成，当以导电模式制造时，其被蜂窝状Si网络包围（约500 nm），而当以锁孔模式制造时，具有更细的蜂窝状Si相（约200 nm）。 。在锁孔模式下，由熔体回流和Marangoni对流引起的强对流也导致纳米Si颗粒沉积在熔池底部。以锁孔方式制造的SLM AlSi10Mg比以导电方式制造的SLM AlSi10Mg具有更好的耐磨性。与传统铸态试样相比，两种SLM试样均具有独特的类蜂窝状网络，因此具有更好的耐磨性。