About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
|
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Assessment of In-situ Defect Mitigation Strategies in Metal Laser Powder Bed Fusion Additive Manufacturing |
Author(s) |
Christine Cummings, David Corbin |
On-Site Speaker (Planned) |
Christine Cummings |
Abstract Scope |
Recent advancements to in-situ process monitoring of laser powder bed fusion (LPBF) additive manufacturing (AM) have enabled localized defect detection. Research into defect mitigation methods, however, is limited to post-processing techniques. This study investigates in-situ defect mitigation methods through localized laser re-melting of defect areas during Ti-6Al-4V builds and takes a first look at the parameters required for successful defect elimination. Mitigation parameters include the mitigation size, the laser power, and the number of layers mitigated. Eliminating defects mid-process reduces energy and material expense, limits the need for post-processing, and improves reliability and consistency in LPBF. To systematically assess mitigation success, process anomalies were seeded into AM parts, generating surrogate defects at known locations. Optimal mitigation parameters, resulted in defect volume reduction by a minimum of 98% compared to predicted defect volumes. These results indicate that in-situ re-melting is a promising method for the elimination of defects in LPBF AM. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |