Integrated control of solidification microstructure and melt pool dimensions in electron beam wire feed additive manufacturing of Ti-6Al-4V
| Autor: | Jack Beuth, Karen M. Taminger, Joy Gockel |
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| Rok vydání: | 2014 |
| Předmět: |
Work (thermodynamics)
Yield (engineering) Materials science Metallurgy Biomedical Engineering Process variable Aspect ratio (image) Industrial and Manufacturing Engineering Grain size Deposition (phase transition) General Materials Science Composite material Constant (mathematics) Engineering (miscellaneous) Scaling |
| Zdroj: | Additive Manufacturing. :119-126 |
| ISSN: | 2214-8604 |
| DOI: | 10.1016/j.addma.2014.09.004 |
| Popis: | The ability to deposit a consistent and predictable solidification microstructure can greatly accelerate additive manufacturing (AM) process qualification. Process mapping is an approach that represents process outcomes in terms of process variables. In this work, a solidification microstructure process map was developed using finite element analysis for deposition of single beads of Ti-6Al-4V via electron beam wire feed AM processes. Process variable combinations yielding constant beta grain size and morphology were identified. Comparison with a previously developed process map for melt pool geometry shows that maintaining a constant melt pool cross sectional area will also yield a constant grain size. Additionally, the grain morphology boundaries are similar to curves of constant melt pool aspect ratio. Experimental results support the numerical predictions and identify a proportional size scaling between beta grain widths and melt pool widths. Results further demonstrate that in situ indirect control of solidification microstructure is possible through direct melt pool dimension control. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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