| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
Improvement of Fatigue Strength in Lightweight Selective Laser Melted Alloys By In-situ and Ex-situ Composition and Heat Treatment |
| Author(s) |
Mustafa Mamduh Mustafa Awd, Jan Johannsen, TSZ Tung Chan, Mohamed Merghany, Claus Emmelmann, Frank Walther, Felix Stern |
| On-Site Speaker (Planned) |
Felix Stern |
| Abstract Scope |
Selective laser melting is a powder-bed-fusion process that is applied to different alloys. Thus, it is essential to study what are the different process variables that affect the static, quasistatic, and cyclic mechanical properties. In this contribution, we introduce two examples of alloys: AlSi (Al-12Si, Al-10Si-Mg) and Ti-6Al-4V. The influence of controlled cooling and degassing mechanisms of residual gases is investigated by structural analysis in electron microscopy, and X-ray computed tomography. Controlled cooling through platform heating or multiexposure treatments increased the dendritic width in AlSi alloys and decomposed alpha prime in Ti-6Al-4V. The alteration was a cause for enhanced ductility and slowing of crack propagation. The cyclic deformation is tracked during mechanical testing and is simulated in FE software using a high-throughput methodology to calculate Woehler curves based on Fatemi-Socie damage parameters. The cyclic deformation simulation is in agreement with the experimental data and quantified cyclic damage using Fatemi-Socie parameters. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |