An investigation of the dendritic segregation in single-crystal René N5 fabricated through scanning laser epitaxy

Amrita Basak, Suman Das

Research output: Contribution to conferencePaperpeer-review

4 Scopus citations

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 languageEnglish (US)
Pages487-498
Number of pages12
StatePublished - 2016
Event27th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2016 - Austin, United States
Duration: Aug 8 2016Aug 10 2016

Conference

Conference27th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2016
CountryUnited States
CityAustin
Period8/8/168/10/16

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'An investigation of the dendritic segregation in single-crystal René N5 fabricated through scanning laser epitaxy'. Together they form a unique fingerprint.

Cite this