| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
Processing and Performance: Oxide Formation in AlSi10Mg and IN718 Builds |
| Author(s) |
Petrus C. Pistorius, Lonnie Alexander Smith, Tomio Ohtsuki |
| On-Site Speaker (Planned) |
Lonnie Alexander Smith |
| Abstract Scope |
Laser powder-bed fusion parts have a high oxygen content (several hundreds of parts per million) compared with wrought parts (that can have total oxygen in single digits of parts per million). For AlSi10Mg components, the oxides have been shown to correlate with pores that initiate fatigue failure; the time to failure can be predicted from measured pore concentrations using extreme-value statistics. In the case of IN718, the oxides are expected to limit fatigue life in the future, once the pore-forming mechanisms are fully controlled. Steps that can limit the oxidation rate are evaluated, based on mass transfer principles and the morphology of oxides deposited on the build surfaces (with and without powder). From kinetic analysis, direct oxidation of the melt pool is insignificant, but spatter oxidation can occur. The rate and exothermicity of oxidation are estimated, to show that spatter oxidation is feasible, with 0.1% oxygen in the build chamber. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |