|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||A-9: Effects of Different Laser Parameters on Microstructure and Melt Pool of Additively Manufactured 316L Stainless Steel
||Filippo Vecchiato, Mark R Wenman, Paul A Hooper
|On-Site Speaker (Planned)
The work investigates the effects of different laser parameters on the microstructure, for single exposure laser pulses on 316L stainless steel. Single spots were deposited using a matrix of controlled parameters for powder thickness layer and laser spot size, with variable laser power and time exposure, respectively between 100 W to 200 W and 800 μs to 12800 μs, whilst the specific enthalpy was kept constant at 31, 43 and 62 GJ/m<sup>3</sup> respectively. Samples were analysed by scanning electron microscopy for size and shape uniformity. Spots were not deposited below the enthalpy threshold of 17 MJ/m<sup>3</sup>. Electron backscattered diffraction imaging and electrolytic etching of sectioned spots in oxalic acid were used to visualise the grain structure of the samples produced. Results show how melt pool size is increased by specific enthalpy and indicate the influence of thermal gradients on the single spot microstructure reporting columnar grains and irregular shaped sub-grains.
||Planned: Supplemental Proceedings volume