| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
A-10: Microstructure, Mechanical Properties, and Fatigue Damage Mechanisms in Laser Powder Bed Al-10Si-0.4Mg Alloys |
| Author(s) |
Timothy D. Piette, Robert J. Warren, Edward J. Hummelt, Diana A. Lados |
| On-Site Speaker (Planned) |
Timothy D. Piette |
| Abstract Scope |
Laser powder bed (LPB) manufactured Al-10Si-0.4Mg was studied in as-fabricated, T6, and HIP+T6 conditions, to understand the effects of microstructure and heat treatment on mechanical properties. Tensile and fatigue crack growth (FCG) properties and behavior were compared with those of conventionally-cast counterparts and related to build orientation and post-processing conditions. The as-fabricated LPB alloys show lower FCG response compared to the conventionally-cast and heat treated LPB alloys. Anisotropic residual stresses in the as-fabricated condition affect the FCG thresholds, resulting in differences between build orientations. Heat treatments alter the microstructure, which causes loss of orientation dependence on properties, improves FCG threshold values, and changes the crack growth mechanisms. Fatigue testing in high-cycle fatigue regime was performed to relate the effects of build orientation, heat treatment, surface condition, and defect morphology and distribution (evaluated using x-ray computed tomography) to fatigue life. Recommendations for microstructure and post-processing optimization for fatigue-critical applications are provided. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |