|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships
||A-35: Prediction of the Balling Defect by a Mesoscale Transient Model Combining Heat Transfer and Fluid Flow
||Yi Li, Yousub Lee, Ji-Cheng Zhao, Wei Zhang
|On-Site Speaker (Planned)
Laser-powder bed fusion (L-PBF) additive manufacturing involves a complex combination of physical phenomena, and understanding of which will help predict the formation of defects and facilitate quality control. Existing mesoscale heat transfer and fluid flow models were utilized to simulate the temperature distribution, fluid flow and surface profile of the molten pool in the powder particle level during laser fusion. The effect of processing conditions on weld pool geometry and defect formation was also investigated experimentally by varying the laser power and scan speed on multiple linear single tracks that were fused using AISI 316L powder and L-PBF. High-speed infrared thermography was incorporated co-axially with the laser beam to track the local laser beam temperature profile. After deposition, optical profilometer was used to examine the balling defect. Both transverse and longitudinal weld pool geometries were observed and compared with the simulation predictions.
||Planned: Supplemental Proceedings volume