Abstract
Dendritic segregation in single-crystal nickel-base superalloy René N5 was investigated in the present study. Samples of René N5 were fabricated through scanning laser epitaxy (SLE) process. SLE is a metal powder bed fusion-based additive manufacturing (AM) process that was exclusively developed for the repair and manufacture of gas turbine hot-section components using nickel-base superalloys. The concentration profiles of the alloying elements in the SLE fabricated René N5 samples obtained from the energy dispersive X-ray spectroscopy (EDS) measurements exhibited strong segregation of rhenium (Re) and tungsten (W) in the dendrite cores, and aluminum (Al) and tantalum (Ta) in the interdendritic regions. Carbides were found to be rich in tantalum (Ta) and tungsten (W). However, a trace amount of rhenium (Re) was also found in the carbide precipitates. In the final stages of the solidification tungsten (W) showed a tendency to accumulate in a y phase layer around the eutectic pool. This work is sponsored by the Office ofNaval Research through grants N00014-14-1-0658.
| Original language | English (US) |
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| Pages | 487-498 |
| Number of pages | 12 |
| State | Published - 2016 |
| Event | 27th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2016 - Austin, United States Duration: Aug 8 2016 → Aug 10 2016 |
Conference
| Conference | 27th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2016 |
|---|---|
| Country/Territory | United States |
| City | Austin |
| Period | 8/8/16 → 8/10/16 |
All Science Journal Classification (ASJC) codes
- Surfaces and Interfaces
- Surfaces, Coatings and Films