|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Late News Posters
||PP-41: The Influence of Processing Parameters on Aluminium Alloy A357 Manufactured by Selective Laser Melting
||Heng Rao, Stéphanie Giet, Chris Huw John Davies, Xinhua Wu
|On-Site Speaker (Planned)
Since conventional casting and Selective Laser Melting (SLM) are two completely different techniques, the aim of this work is to investigate the effects of SLM on the microstructure and properties of A357 aluminium casting alloys. The SLM processing parameters were optimised to achieve maximum density and tensile properties, corresponding to an extremely fine microstructure with very few pores. The microstructure is about ten times finer after SLM than after casting. This translates to differences in mechanical properties. Substrate temperature and the combination of laser parameters influence the mechanical properties via changes in thermal history and molten pool characteristics. Fractographic studies have been performed to understand mechanical property anisotropy by comparing fracture surfaces of tensile samples built either in vertical or horizontal orientations. As a result, we explain the anisotropy in relation to the directionality by the difference in the underline microstructural features.