|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location Specific, Processing-Microstructure-Property-Relationships III
||Prediction of Gas Entrapment during Selective Laser Melting by Meso-scale Simulation
||Juergen Jakumeit, Romuald Laqua, Santhanu Jana, Jonas Zielinski
|On-Site Speaker (Planned)
Selective Laser Melting (SLM) is widely-used process for Additive Manufacturing of metals. During melting of the metal powder gas in between the powder particles cannot completely leave the sample before solidification. The remaining entrapment gas reduces the density of the sample and can lead to binding defects and reduced mechanical properties due to porosity.
To predict gas entrapment by computer simulation a three phase finite-volume method with arbitrary polyhedral control volumes is used to solve melting, flow and solidification of the metal powder in a strongly coupled way. The Volume-of-Fluid approach is used to identify the phase separation between gas, melt and solid in connection with an Interface-Capturing scheme to ensure sharp interfaces between phases.
This methodology was validated by several casting applications and single track SLM experiments. The influence of metal powder and process parameter on the amount and distribution of entrapped gas was investigated and processing rules derived.
||Planned: Supplemental Proceedings volume