Carbide formation in additive manufacturing of single-crystal superalloy René N5 processed through scanning laser epitaxy

Amrita Basak, Suman Das

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations

Abstract

Carbon is added to single-crystal nickel-base superalloys to reduce the formation of grain defects. Carbon and a carbide former drive precipitation of carbides at grain boundaries reducing grain boundary sliding. In this paper, carbide formation in nickel-base superalloy René N5 was studied using optical microscopy (OM), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Samples of René N5 were fabricated using scanning laser epitaxy (SLE), a powder bed fusion-based additive manufacturing (AM) technique. The carbides formed in these alloys were mostly Chinese script-type carbides which formed discrete networks in the interdendritic region. In addition, blocky and elongated carbides were also observed. EDS analysis showed the carbides to be Ta rich. The findings also showed the presence of rhenium in the Chinese-script carbides. However, rhenium was not found in the blocky carbides.

Original languageEnglish (US)
Title of host publicationMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
PublisherAssociation for Iron and Steel Technology, AISTECH
Pages51-58
Number of pages8
ISBN (Electronic)9781510833142
StatePublished - Jan 1 2016
EventMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016 - Salt Lake City, United States
Duration: Oct 23 2016Oct 27 2016

Publication series

NameMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
Volume1

Other

OtherMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
CountryUnited States
CitySalt Lake City
Period10/23/1610/27/16

All Science Journal Classification (ASJC) codes

  • Materials Science (miscellaneous)
  • Mechanics of Materials
  • Energy Engineering and Power Technology

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