Kun Yang

TL;DR: In this article, the effects of selective laser melting (SLM) on the microstructure and mechanical properties of A357 aluminium alloys were investigated, where the SLM processing parameters were optimised to achieve maximum density, corresponding to an extremely fine micro structure with very few pores, which translates to differences in mechanical properties compared to conventional cast alloy.

TL;DR: In this paper, the authors investigated the martensite decomposition in various annealed samples by XRD, SEM and TEM, and found that annealing at 700°C or 800°C for 2´h was not sufficient to obtain a fully decomposed microstructure.

TL;DR: In this article, an Al-Mg-Sc-Zr alloy was manufactured using selective laser melting (SLM) at platform temperatures of both 35°C and 200°C, and the effects of platform temperature and applied energy density on porosity characteristics were studied by image analysis.

TL;DR: In this paper, the authors investigated the relationship between densification, hardness and electrical conductivity of an Al-Mg-Sc-Zr alloy fabricated by selective laser melting.

Abstract: To improve the selective laser melting (SLM) productivity, a high laser power and accordingly adjusted parameters are employed to facilitate a high build rate. Three distinct processing strategies with incremental build rate are developed for SLM Ti-6Al-4V. Various types of defects are investigated. Further studies were carried out by heat-treatment and hot isostatic pressing to evaluate the influence of microstructure and porosity on mechanical properties. The anisotropic mechanical property in horizontally and vertically build samples were observed, which was attributable to the columnar grains and spatial arrangement of defects. Regardless of anisotropy, a post-SLM heat-treatment at 800°C for 2 h produces a combined high strength and ductility.