Characterisation of a complex thin walled structure fabricated by selective laser melting using a ferritic oxide dispersion strengthened steel
| Autor: | Gordon J. Tatlock, Thomas Boegelein, Eleftherios Louvis, Karl Dawson, Andrew R. Jones |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Aluminium oxides
0209 industrial biotechnology Materials science Annealing (metallurgy) Precipitation (chemistry) Mechanical Engineering Alloy Metallurgy Oxide 02 engineering and technology engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics chemistry.chemical_compound 020901 industrial engineering & automation chemistry Mechanics of Materials engineering General Materials Science Selective laser melting Composite material 0210 nano-technology Dispersion (chemistry) Single crystal |
| Zdroj: | Materials Characterization. 112:30-40 |
| ISSN: | 1044-5803 |
| Popis: | Oxide dispersion strengthened (ODS) alloys exhibit superior mechanical and physical properties due to the presence of nanoscopic Y(Al, Ti) oxide precipitates, but their manufacturing process is complex. The present study is aimed at further investigation of the application of an alternative, Additive Manufacturing (AM) technique, Selective Laser Melting (SLM), to the production of consolidated ODS alloy components. Mechanically alloyed PM2000 (ODS-FeCrAl) powders have been consolidated and a fine dispersion of Y-containing precipitates were observed in an as built thin-walled component, but these particles were typically poly-crystalline and contained a variety of elements including O, Al, Ti, Cr and Fe. Application of post-build heat treatments resulted in the modification of particle structures and compositions; in the annealed condition most precipitates were transformed to single crystal yttrium aluminium oxides. During the annealing treatment, precipitate distributions homogenised and localised variations in number density were diminished. The resulting volume fractions of those precipitates were 25–40% lower than have been reported in conventionally processed PM2000, which was attributed to Y-rich slag-like surface features and inclusions formed during SLM. |
| Databáze: | OpenAIRE |
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