@inproceedings{facfe56fd8674b54bb49229150e70a4d,
title = "A study on the effects of substrate crystallographic orientation on microstructural characteristics of Ren{\'e} N5 processed through scanning laser epitaxy",
abstract = "In this work, the single-pass fabrication of more than 1000 μm thick Ren{\'e} N5, a high γ′ and {"}non-weldable{"} single-crystal superalloy on top of investment cast Ren{\'e} 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 Ren{\'e} 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 Ren{\'e} N5 represent one of the few successes reported for a {"}non-weldable{"} single-crystal superalloy of its kind using powder-bed based AM process.",
author = "Amrita Basak and Suman Das",
note = "Funding Information: This work is sponsored by the Office of Naval Research through grants N00014-11-1-0670 and N00014-14-1-0658. The authors would like to thank Mr. Ron Witt, EBSD Analytical, 2044 N 1100 E Lehi, Utah 84043 for his assistance with EBSD Analysis. Disclosures Dr. Suman Das is a cofounder of DDM Systems, a start-up company commercializing SLE technology. Dr. Das and Georgia Tech are entitled to royalties derived from DDM Systems' sale of products related to the research described in this paper. This study could affect their personal financial status. The terms of this arrangement have been reviewed and approved by Georgia Tech in accordance with its conflict of interest policies.; 13th International Symposium on Superalloys, SUPERALLOYS 2016 ; Conference date: 11-09-2016 Through 15-09-2016",
year = "2016",
doi = "10.1002/9781119075646.ch110",
language = "English (US)",
series = "Proceedings of the International Symposium on Superalloys",
publisher = "Minerals, Metals and Materials Society",
pages = "1041--1049",
editor = "Mark Hardy and Eric Huron and Uwe Glatzel and Brian Griffin and Beth Lewis and Cathie Rae and Venkat Seetharaman and Sammy Tin",
booktitle = "SUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys",
address = "United States",
}