A study on the effects of substrate crystallographic orientation on microstructural characteristics of René N5 processed through scanning laser epitaxy

Amrita Basak, Suman Das

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

7 Scopus citations

Abstract

In this work, the single-pass fabrication of more than 1000 μm thick René N5, a high γ′ and "non-weldable" single-crystal superalloy on top of investment cast René N5 substrates having 〈100〉 and 〈001〉 crystallographic orientations through scanning laser epitaxy (SLE) was demonstrated. SLE is a powder-bed fusion based additive manufacturing (AM) process that was exclusively developed to repair and manufacture gas turbine hotsection components made of nickel-base superalloys. The microstructures of the René N5 deposits were investigated using optical imaging, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and electron back scatter diffraction (EBSD). Optical microscopy revealed that the substrate crystallographic orientation of 〈100〉 did not prohibit dendritic growth along the 〈001〉 direction in the deposit region. Scanning electron microscopy investigations showed the presence of finer microstructure in the deposit region compared to the substrate region. The crack-free deposits obtained for René N5 represent one of the few successes reported for a "non-weldable" single-crystal superalloy of its kind using powder-bed based AM process.

Original languageEnglish (US)
Title of host publicationSUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
EditorsEric Huron, Uwe Glatzel, Cathie Rae, Sammy Tin, Beth Lewis, Venkat Seetharaman, Mark Hardy, Brian Griffin
PublisherMinerals, Metals and Materials Society
Pages1041-1049
Number of pages9
ISBN (Electronic)9781118996669
StatePublished - Jan 1 2016
Event13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
Duration: Sep 11 2016Sep 15 2016

Publication series

NameProceedings of the International Symposium on Superalloys
Volume2016-January

Conference

Conference13th International Symposium on Superalloys, SUPERALLOYS 2016
CountryUnited States
CitySeven Springs
Period9/11/169/15/16

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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    Basak, A., & Das, S. (2016). A study on the effects of substrate crystallographic orientation on microstructural characteristics of René N5 processed through scanning laser epitaxy. In E. Huron, U. Glatzel, C. Rae, S. Tin, B. Lewis, V. Seetharaman, M. Hardy, & B. Griffin (Eds.), SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys (pp. 1041-1049). (Proceedings of the International Symposium on Superalloys; Vol. 2016-January). Minerals, Metals and Materials Society.