| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing: Processing Effects on Microstructure and Material Performance
|
| Presentation Title |
Controlling Residual Stress and Phase Transformations during Laser Powder Bed Fusion through large-area Surface Heating |
| Author(s) |
John D. Roehling, William Smith, Tien Roehling, Gabriel Guss, Bey Vrancken, Joseph McKeown, Michael Hill, Manyalibo Matthews |
| On-Site Speaker (Planned) |
John D. Roehling |
| Abstract Scope |
Residual stresses are large in additively manufactured parts because of the high thermal gradients inherent to the process. In this work, residual stresses are effectively reduced by using a large-area heating beam in conjunction with the typical, tightly-focused, scanning beam to control the thermal history of fabricated parts. A reduction up to 90% of the effective residual stress was realized in bridge test specimens. Control of the thermal history is demonstrated and its effects on the microstructure and residual stress distribution are examined in stainless steel 316L. The decomposition and/or avoidance of the martensite transformation in Ti6Al4V is also demonstrated in test specimens.
This work was performed under the auspices of the U.S. Department of Energy (DOE) by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |