|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Additive Manufacturing of Metals: Establishing Location-Specific Processing-Microstructure-Property Relationships
||A-39: Sub-surface Material Interactions in Laser Polishing Electron Beam Additive Manufactured Ti6Al4V Components
||Yingtao Tian, Wojciech S. Gora, Aldara Pan Cabo, Lakshmi L. Parimi, Duncan P. Hand, Philip B. Prangnell
|On-Site Speaker (Planned)
Laser polishing (LP) is an emerging technique with potential for smoothing the rough fatigue initiation prone surface of additive manufactured (AM) components. It uses a laser to re-melt a thin surface layer and smooth the surface due to surface tension in the melt pool. However, re-melting and solidifying the surface layer can significantly modify the subsurface material. This study has used an EBM Ti6Al4V component as an example to address these key issues and evaluate the capability of this technique for improving the surface quality of AM parts. Experiments have shown that the surface roughness can be reduced by over 85%, but the re-melted layer undergoes a change in texture and a martensitic transformation which results in a small increase in hardness. In addition, a significant level of surface residual stresses was generated, but these can be relaxed to virtually zero by standard stress relief heat treatment.
||Planned: Supplemental Proceedings volume